In the Linux kernel, the following vulnerability has been resolved: x86/shstk: Prevent deadlock during shstk sigreturn During sigreturn the shadow stack signal frame is popped. The kernel does this by reading the shadow stack using normal read accesses. When it can't assume the memory is shadow stack, it takes extra steps to makes sure it is reading actual shadow stack memory and not other normal readable memory. It does this by holding the mmap read lock while doing the access and checking the flags of the VMA. Unfortunately that is not safe. If the read of the shadow stack sigframe hits a page fault, the fault handler will try to recursively grab another mmap read lock. This normally works ok, but if a writer on another CPU is also waiting, the second read lock could fail and cause a deadlock. Fix this by not holding mmap lock during the read access to userspace. Instead use mmap_lock_speculate_...() to watch for changes between dropping mmap lock and the userspace access. Retry if anything grabbed an mmap write lock in between and could have changed the VMA. These mmap_lock_speculate_...() helpers use mm::mm_lock_seq, which is only available when PER_VMA_LOCK is configured. So make X86_USER_SHADOW_STACK depend on it. On x86, PER_VMA_LOCK is a default configuration for SMP kernels. So drop support for the other configs under the assumption that the !SMP shadow stack user base does not exist. Currently there is a check that skips the lookup work when the SSP can be assumed to be on a shadow stack. While reorganizing the function, remove the optimization to make the tricky code flows more common, such that issues like this cannot escape detection for so long.

The remote Ubuntu 26.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8507-1 advisory.

    It was discovered that some AMD processors did not properly clear data in the floating point divider unit     during speculative execution. A local attacker could use this to expose sensitive information.
    (CVE-2025-54505)

    Several security issues were discovered in the Linux kernel. An attacker could possibly use these to     compromise the system. This update corrects flaws in the following subsystems:

    - ARM64 architecture;

    - x86 architecture;

    - Block layer subsystem;

    - Cryptographic API;

    - Rados block device (RBD) driver;

    - Compressed RAM block device driver;

    - Character device driver;

    - TPM device driver;

    - Hardware crypto device drivers;

    - EDAC drivers;

    - GPU drivers;

    - Greybus drivers;

    - HID subsystem;

    - Microsoft Hyper-V drivers;

    - Hardware monitoring drivers;

    - I2C subsystem;

    - IIO subsystem;

    - InfiniBand drivers;

    - Input Device core drivers;

    - LED subsystem;

    - Multiple devices driver;

    - Media drivers;

    - IBM Advanced System Management driver;

    - MTD block device drivers;

    - Network drivers;

    - Microsoft Azure Network Adapter (MANA) driver;

    - NTB driver;

    - NVME drivers;

    - Device tree and open firmware driver;

    - PCI subsystem;

    - Remote Processor subsystem;

    - SCSI subsystem;

    - SPI subsystem;

    - Realtek RTL8723BS SDIO drivers;

    - SM750 framebuffer staging driver;

    - Thermal drivers;

    - USB Gadget drivers;

    - USB over IP driver;

    - VFIO drivers;

    - Framebuffer layer;

    - 9P distributed file system;

    - AFS file system;

    - Ceph distributed file system;

    - File systems infrastructure;

    - EROFS file system;

    - Ext4 file system;

    - F2FS file system;

    - FUSE (File system in Userspace);

    - Journaling layer for block devices (JBD2);

    - NILFS2 file system;

    - File system notification infrastructure;

    - NTFS3 file system;

    - OCFS2 file system;

    - SMB network file system;

    - UDF file system;

    - XFS file system;

    - Codetag library;

    - Memory management;

    - Memory Management;

    - KVM subsystem;

    - Tracing infrastructure;

    - User-space API (UAPI);

    - io_uring subsystem;

    - Locking primitives;

    - Timer subsystem;

    - Scatterlist API;

    - Heterogeneous memory management;

    - KASAN memory debugging framework;

    - Bluetooth subsystem;

    - Ethernet bridge;

    - CAIF protocol;

    - CAN network layer;

    - Ceph Core library;

    - IPv4 networking;

    - IPv6 networking;

    - Multipath TCP;

    - Netfilter;

    - NFC subsystem;

    - Packet sockets;

    - Qualcomm IPC Router (QRTR);

    - RDS protocol;

    - RxRPC session sockets;

    - SMC sockets;

    - Stream parser;

    - Landlock security;

    - SELinux security module;

    - ALSA framework;

    - Generic PCM loopback sound driver;

    - FireWire sound drivers;

    - Creative Sound Blaster X-Fi driver;

    - QCOM ASoC drivers;

    - USB sound devices;

    - Objtool; (CVE-2026-31532, CVE-2026-31574, CVE-2026-31575, CVE-2026-31576, CVE-2026-31577,     CVE-2026-31578, CVE-2026-31579, CVE-2026-31580, CVE-2026-31581, CVE-2026-31582, CVE-2026-31583,     CVE-2026-31584, CVE-2026-31585, CVE-2026-31586, CVE-2026-31587, CVE-2026-31588, CVE-2026-31589,     CVE-2026-31590, CVE-2026-31591, CVE-2026-31592, CVE-2026-31593, CVE-2026-31594, CVE-2026-31595,     CVE-2026-31596, CVE-2026-31597, CVE-2026-31598, CVE-2026-31599, CVE-2026-31600, CVE-2026-31601,     CVE-2026-31602, CVE-2026-31603, CVE-2026-31604, CVE-2026-31605, CVE-2026-31606, CVE-2026-31607,     CVE-2026-31608, CVE-2026-31609, CVE-2026-31610, CVE-2026-31611, CVE-2026-31612, CVE-2026-31613,     CVE-2026-31614, CVE-2026-31615, CVE-2026-31616, CVE-2026-31617, CVE-2026-31618, CVE-2026-31619,     CVE-2026-31620, CVE-2026-31621, CVE-2026-31622, CVE-2026-31623, CVE-2026-31624, CVE-2026-31625,     CVE-2026-31626, CVE-2026-31627, CVE-2026-31628, CVE-2026-31629, CVE-2026-31686, CVE-2026-31694,     CVE-2026-31696, CVE-2026-31697, CVE-2026-31698, CVE-2026-31699, CVE-2026-31700, CVE-2026-31701,     CVE-2026-31702, CVE-2026-31703, CVE-2026-31704, CVE-2026-31705, CVE-2026-31706, CVE-2026-31707,     CVE-2026-31708, CVE-2026-31709, CVE-2026-31710, CVE-2026-31711, CVE-2026-31712, CVE-2026-31713,     CVE-2026-31714, CVE-2026-31715, CVE-2026-31716, CVE-2026-31717, CVE-2026-31718, CVE-2026-31719,     CVE-2026-43058, CVE-2026-43071, CVE-2026-43072, CVE-2026-43073, CVE-2026-43348, CVE-2026-43349,     CVE-2026-43350, CVE-2026-43491, CVE-2026-43493, CVE-2026-43499, CVE-2026-43501, CVE-2026-45986,     CVE-2026-45987, CVE-2026-45988, CVE-2026-45989, CVE-2026-45990, CVE-2026-45991, CVE-2026-45994,     CVE-2026-45995, CVE-2026-45996, CVE-2026-45997, CVE-2026-45999, CVE-2026-46001, CVE-2026-46002,     CVE-2026-46003, CVE-2026-46004, CVE-2026-46005, CVE-2026-46006, CVE-2026-46007, CVE-2026-46008,     CVE-2026-46009, CVE-2026-46010, CVE-2026-46011, CVE-2026-46012, CVE-2026-46013, CVE-2026-46014,     CVE-2026-46015, CVE-2026-46016, CVE-2026-46018, CVE-2026-46019, CVE-2026-46020, CVE-2026-46021,     CVE-2026-46022, CVE-2026-46023, CVE-2026-46024, CVE-2026-46025, CVE-2026-46026, CVE-2026-46027,     CVE-2026-46028, CVE-2026-46029, CVE-2026-46030, CVE-2026-46031, CVE-2026-46032, CVE-2026-46033,     CVE-2026-46034, CVE-2026-46035, CVE-2026-46036, CVE-2026-46037, CVE-2026-46038, CVE-2026-46039,     CVE-2026-46040, CVE-2026-46041, CVE-2026-46042, CVE-2026-46043, CVE-2026-46044, CVE-2026-46045,     CVE-2026-46046, CVE-2026-46047, CVE-2026-46049, CVE-2026-46050, CVE-2026-46051, CVE-2026-46052,     CVE-2026-46053, CVE-2026-46054, CVE-2026-46056, CVE-2026-46057, CVE-2026-46058, CVE-2026-46059,     CVE-2026-46060, CVE-2026-46061, CVE-2026-46062, CVE-2026-46063, CVE-2026-46064, CVE-2026-46065,     CVE-2026-46066, CVE-2026-46067, CVE-2026-46068, CVE-2026-46069, CVE-2026-46070, CVE-2026-46071,     CVE-2026-46072, CVE-2026-46073, CVE-2026-46074, CVE-2026-46075, CVE-2026-46076, CVE-2026-46077,     CVE-2026-46078, CVE-2026-46079, CVE-2026-46080, CVE-2026-46081, CVE-2026-46082, CVE-2026-46083,     CVE-2026-46084, CVE-2026-46085, CVE-2026-46086, CVE-2026-46087, CVE-2026-46088, CVE-2026-46089,     CVE-2026-46090, CVE-2026-46091, CVE-2026-46092, CVE-2026-46093, CVE-2026-46094, CVE-2026-46095,     CVE-2026-46096, CVE-2026-46097, CVE-2026-46098, CVE-2026-46099, CVE-2026-46100, CVE-2026-46101,     CVE-2026-46102, CVE-2026-46103, CVE-2026-46115, CVE-2026-46119, CVE-2026-46135, CVE-2026-46137,     CVE-2026-46155, CVE-2026-46185, CVE-2026-46195, CVE-2026-46243, CVE-2026-46244, CVE-2026-46276,     CVE-2026-46277, CVE-2026-46278, CVE-2026-46279, CVE-2026-46280, CVE-2026-46281, CVE-2026-46282,     CVE-2026-46283, CVE-2026-46284, CVE-2026-46285, CVE-2026-46286, CVE-2026-46287, CVE-2026-46288,     CVE-2026-46289, CVE-2026-46316, CVE-2026-46332, CVE-2026-52904, CVE-2026-52905, CVE-2026-52906,     CVE-2026-52907, CVE-2026-52933)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 26.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8488-1 advisory.

    It was discovered that some AMD processors did not properly clear data in the floating point divider unit     during speculative execution. A local attacker could use this to expose sensitive information.
    (CVE-2025-54505)

    Several security issues were discovered in the Linux kernel. An attacker could possibly use these to     compromise the system. This update corrects flaws in the following subsystems:

    - ARM64 architecture;

    - x86 architecture;

    - Block layer subsystem;

    - Cryptographic API;

    - Rados block device (RBD) driver;

    - Compressed RAM block device driver;

    - Character device driver;

    - TPM device driver;

    - Hardware crypto device drivers;

    - EDAC drivers;

    - GPU drivers;

    - Greybus drivers;

    - HID subsystem;

    - Microsoft Hyper-V drivers;

    - Hardware monitoring drivers;

    - I2C subsystem;

    - IIO subsystem;

    - InfiniBand drivers;

    - Input Device core drivers;

    - LED subsystem;

    - Multiple devices driver;

    - Media drivers;

    - IBM Advanced System Management driver;

    - MTD block device drivers;

    - Network drivers;

    - Microsoft Azure Network Adapter (MANA) driver;

    - NTB driver;

    - NVME drivers;

    - Device tree and open firmware driver;

    - PCI subsystem;

    - Remote Processor subsystem;

    - SCSI subsystem;

    - SPI subsystem;

    - Realtek RTL8723BS SDIO drivers;

    - SM750 framebuffer staging driver;

    - Thermal drivers;

    - USB Gadget drivers;

    - USB over IP driver;

    - VFIO drivers;

    - Framebuffer layer;

    - 9P distributed file system;

    - AFS file system;

    - Ceph distributed file system;

    - File systems infrastructure;

    - EROFS file system;

    - Ext4 file system;

    - F2FS file system;

    - FUSE (File system in Userspace);

    - Journaling layer for block devices (JBD2);

    - NILFS2 file system;

    - File system notification infrastructure;

    - NTFS3 file system;

    - OCFS2 file system;

    - SMB network file system;

    - UDF file system;

    - XFS file system;

    - Codetag library;

    - Memory management;

    - Memory Management;

    - KVM subsystem;

    - Tracing infrastructure;

    - User-space API (UAPI);

    - io_uring subsystem;

    - Locking primitives;

    - Timer subsystem;

    - Scatterlist API;

    - Heterogeneous memory management;

    - KASAN memory debugging framework;

    - Bluetooth subsystem;

    - Ethernet bridge;

    - CAIF protocol;

    - CAN network layer;

    - Ceph Core library;

    - IPv4 networking;

    - IPv6 networking;

    - Multipath TCP;

    - Netfilter;

    - NFC subsystem;

    - Packet sockets;

    - Qualcomm IPC Router (QRTR);

    - RDS protocol;

    - RxRPC session sockets;

    - SMC sockets;

    - Stream parser;

    - Landlock security;

    - SELinux security module;

    - ALSA framework;

    - Generic PCM loopback sound driver;

    - FireWire sound drivers;

    - Creative Sound Blaster X-Fi driver;

    - QCOM ASoC drivers;

    - USB sound devices;

    - Objtool; (CVE-2026-31532, CVE-2026-31574, CVE-2026-31575, CVE-2026-31576, CVE-2026-31577,     CVE-2026-31578, CVE-2026-31579, CVE-2026-31580, CVE-2026-31581, CVE-2026-31582, CVE-2026-31583,     CVE-2026-31584, CVE-2026-31585, CVE-2026-31586, CVE-2026-31587, CVE-2026-31588, CVE-2026-31589,     CVE-2026-31590, CVE-2026-31591, CVE-2026-31592, CVE-2026-31593, CVE-2026-31594, CVE-2026-31595,     CVE-2026-31596, CVE-2026-31597, CVE-2026-31598, CVE-2026-31599, CVE-2026-31600, CVE-2026-31601,     CVE-2026-31602, CVE-2026-31603, CVE-2026-31604, CVE-2026-31605, CVE-2026-31606, CVE-2026-31607,     CVE-2026-31608, CVE-2026-31609, CVE-2026-31610, CVE-2026-31611, CVE-2026-31612, CVE-2026-31613,     CVE-2026-31614, CVE-2026-31615, CVE-2026-31616, CVE-2026-31617, CVE-2026-31618, CVE-2026-31619,     CVE-2026-31620, CVE-2026-31621, CVE-2026-31622, CVE-2026-31623, CVE-2026-31624, CVE-2026-31625,     CVE-2026-31626, CVE-2026-31627, CVE-2026-31628, CVE-2026-31629, CVE-2026-31686, CVE-2026-31694,     CVE-2026-31696, CVE-2026-31697, CVE-2026-31698, CVE-2026-31699, CVE-2026-31700, CVE-2026-31701,     CVE-2026-31702, CVE-2026-31703, CVE-2026-31704, CVE-2026-31705, CVE-2026-31706, CVE-2026-31707,     CVE-2026-31708, CVE-2026-31709, CVE-2026-31710, CVE-2026-31711, CVE-2026-31712, CVE-2026-31713,     CVE-2026-31714, CVE-2026-31715, CVE-2026-31716, CVE-2026-31717, CVE-2026-31718, CVE-2026-31719,     CVE-2026-43058, CVE-2026-43071, CVE-2026-43072, CVE-2026-43073, CVE-2026-43348, CVE-2026-43349,     CVE-2026-43350, CVE-2026-43491, CVE-2026-43493, CVE-2026-43499, CVE-2026-43501, CVE-2026-45986,     CVE-2026-45987, CVE-2026-45988, CVE-2026-45989, CVE-2026-45990, CVE-2026-45991, CVE-2026-45994,     CVE-2026-45995, CVE-2026-45996, CVE-2026-45997, CVE-2026-45999, CVE-2026-46001, CVE-2026-46002,     CVE-2026-46003, CVE-2026-46004, CVE-2026-46005, CVE-2026-46006, CVE-2026-46007, CVE-2026-46008,     CVE-2026-46009, CVE-2026-46010, CVE-2026-46011, CVE-2026-46012, CVE-2026-46013, CVE-2026-46014,     CVE-2026-46015, CVE-2026-46016, CVE-2026-46018, CVE-2026-46019, CVE-2026-46020, CVE-2026-46021,     CVE-2026-46022, CVE-2026-46023, CVE-2026-46024, CVE-2026-46025, CVE-2026-46026, CVE-2026-46027,     CVE-2026-46028, CVE-2026-46029, CVE-2026-46030, CVE-2026-46031, CVE-2026-46032, CVE-2026-46033,     CVE-2026-46034, CVE-2026-46035, CVE-2026-46036, CVE-2026-46037, CVE-2026-46038, CVE-2026-46039,     CVE-2026-46040, CVE-2026-46041, CVE-2026-46042, CVE-2026-46043, CVE-2026-46044, CVE-2026-46045,     CVE-2026-46046, CVE-2026-46047, CVE-2026-46049, CVE-2026-46050, CVE-2026-46051, CVE-2026-46052,     CVE-2026-46053, CVE-2026-46054, CVE-2026-46056, CVE-2026-46057, CVE-2026-46058, CVE-2026-46059,     CVE-2026-46060, CVE-2026-46061, CVE-2026-46062, CVE-2026-46063, CVE-2026-46064, CVE-2026-46065,     CVE-2026-46066, CVE-2026-46067, CVE-2026-46068, CVE-2026-46069, CVE-2026-46070, CVE-2026-46071,     CVE-2026-46072, CVE-2026-46073, CVE-2026-46074, CVE-2026-46075, CVE-2026-46076, CVE-2026-46077,     CVE-2026-46078, CVE-2026-46079, CVE-2026-46080, CVE-2026-46081, CVE-2026-46082, CVE-2026-46083,     CVE-2026-46084, CVE-2026-46085, CVE-2026-46086, CVE-2026-46087, CVE-2026-46088, CVE-2026-46089,     CVE-2026-46090, CVE-2026-46091, CVE-2026-46092, CVE-2026-46093, CVE-2026-46094, CVE-2026-46095,     CVE-2026-46096, CVE-2026-46097, CVE-2026-46098, CVE-2026-46099, CVE-2026-46100, CVE-2026-46101,     CVE-2026-46102, CVE-2026-46103, CVE-2026-46115, CVE-2026-46119, CVE-2026-46135, CVE-2026-46137,     CVE-2026-46155, CVE-2026-46185, CVE-2026-46195, CVE-2026-46243, CVE-2026-46244, CVE-2026-46276,     CVE-2026-46277, CVE-2026-46278, CVE-2026-46279, CVE-2026-46280, CVE-2026-46281, CVE-2026-46282,     CVE-2026-46283, CVE-2026-46284, CVE-2026-46285, CVE-2026-46286, CVE-2026-46287, CVE-2026-46288,     CVE-2026-46289, CVE-2026-46316, CVE-2026-46332, CVE-2026-52904, CVE-2026-52905, CVE-2026-52906,     CVE-2026-52907, CVE-2026-52933)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 26.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8489-1 advisory.

    It was discovered that the Linux kernel did not properly handle shared page fragments during socket buffer     operations, collectively known as Dirty Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in     the RxRPC networking subsystem when processing paged fragments. A local attacker could use this to     escalate privileges, or possibly escape a container. (CVE-2026-43284, CVE-2026-43500, CVE-2026-45998,     CVE-2026-46000)

    It was discovered that a logic flaw existed in the XFRM ESP-in-TCP subsystem in the Linux kernel when     handling socket buffer fragments. This flaw is known as Fragnesia. A local attacker could use this to     escalate privileges, or possibly escape a container. (CVE-2026-43503, CVE-2026-46300)

    Qualys discovered that a race condition existed in the ptrace subsystem of the Linux kernel when     privileged processes are exiting. An unprivileged local attacker could use this issue to expose sensitive     information. (CVE-2026-46333)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contain a memory leak when handling     AppArmor notifications. A local attacker could use this to cause resource exhaustion. (CVE-2026-47326)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contain a NULL pointer dereference     when handling AppArmor notifications. A local attacker could use this to cause a kernel oops.
    (CVE-2026-47327)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained an invalid free when     handling AppArmor notifications. A local attacker could use this to corrupt kernel memory.
    (CVE-2026-47328)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained insufficient validation of     AppArmor notification responses. A local attacker could use this to allow crafted responses to be     processed. (CVE-2026-47329)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 used an uninitialized variable when     handling AppArmor notifications. A local attacker could use this to cause incorrect caching of data.
    (CVE-2026-47330)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained an out-of-bounds (OOB) read     when handling AppArmor notifications. A local attacker could use this to cause information disclosure of     kernel memory. (CVE-2026-47332)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained a out-of-bounds (OOB) read     when handling AppArmor notifications. A local attacker could use this to cause kernel memory corruption     and, theoretically, influence processing of AppArmor policies. (CVE-2026-47333)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained incorrect holding of locks     when handling AppArmor notifications. A local attacker could use this to cause a kernel panic or deadlock.
    (CVE-2026-47334)

    Tristan Madani and Trevor Lawrence have each independently discovered that Ubuntu Linux kernel 6.8, 6.17     and 7.0 contained a NULL pointer dereference when handling AppArmor network socket mediation. A local     attacker could use this to cause a kernel oops. (CVE-2026-47337)

    Several security issues were discovered in the Linux kernel. An attacker could possibly use these to     compromise the system. This update corrects flaws in the following subsystems:

    - ARM64 architecture;

    - x86 architecture;

    - Block layer subsystem;

    - Cryptographic API;

    - Rados block device (RBD) driver;

    - Compressed RAM block device driver;

    - Character device driver;

    - TPM device driver;

    - Hardware crypto device drivers;

    - EDAC drivers;

    - GPU drivers;

    - Greybus drivers;

    - Hardware monitoring drivers;

    - IIO subsystem;

    - InfiniBand drivers;

    - Input Device core drivers;

    - LED subsystem;

    - Multiple devices driver;

    - Media drivers;

    - IBM Advanced System Management driver;

    - MTD block device drivers;

    - Network drivers;

    - Microsoft Azure Network Adapter (MANA) driver;

    - NVME drivers;

    - Device tree and open firmware driver;

    - PCI subsystem;

    - Remote Processor subsystem;

    - SCSI subsystem;

    - SPI subsystem;

    - Thermal drivers;

    - VFIO drivers;

    - Framebuffer layer;

    - 9P distributed file system;

    - AFS file system;

    - Ceph distributed file system;

    - EROFS file system;

    - File systems infrastructure;

    - Ext4 file system;

    - Journaling layer for block devices (JBD2);

    - File system notification infrastructure;

    - NTFS3 file system;

    - OCFS2 file system;

    - Overlay file system;

    - SMB network file system;

    - UDF file system;

    - XFS file system;

    - Codetag library;

    - Memory management;

    - Tracing infrastructure;

    - io_uring subsystem;

    - Locking primitives;

    - Scatterlist API;

    - Heterogeneous memory management;

    - Bluetooth subsystem;

    - Ethernet bridge;

    - CAIF protocol;

    - Ceph Core library;

    - Networking core;

    - IPv4 networking;

    - IPv6 networking;

    - Multipath TCP;

    - Netfilter;

    - Qualcomm IPC Router (QRTR);

    - RDS protocol;

    - RxRPC session sockets;

    - SMC sockets;

    - Stream parser;

    - Landlock security;

    - SELinux security module;

    - ALSA framework;

    - Generic PCM loopback sound driver;

    - Creative Sound Blaster X-Fi driver;

    - USB sound devices; (CVE-2026-43491, CVE-2026-43493, CVE-2026-43494, CVE-2026-43499, CVE-2026-43501,     CVE-2026-45986, CVE-2026-45987, CVE-2026-45988, CVE-2026-45989, CVE-2026-45990, CVE-2026-45991,     CVE-2026-45994, CVE-2026-45995, CVE-2026-45996, CVE-2026-45997, CVE-2026-45999, CVE-2026-46001,     CVE-2026-46002, CVE-2026-46003, CVE-2026-46004, CVE-2026-46005, CVE-2026-46006, CVE-2026-46007,     CVE-2026-46008, CVE-2026-46009, CVE-2026-46010, CVE-2026-46011, CVE-2026-46012, CVE-2026-46013,     CVE-2026-46014, CVE-2026-46015, CVE-2026-46016, CVE-2026-46018, CVE-2026-46019, CVE-2026-46020,     CVE-2026-46021, CVE-2026-46022, CVE-2026-46023, CVE-2026-46024, CVE-2026-46025, CVE-2026-46026,     CVE-2026-46027, CVE-2026-46028, CVE-2026-46029, CVE-2026-46030, CVE-2026-46031, CVE-2026-46032,     CVE-2026-46033, CVE-2026-46034, CVE-2026-46035, CVE-2026-46036, CVE-2026-46037, CVE-2026-46038,     CVE-2026-46039, CVE-2026-46040, CVE-2026-46041, CVE-2026-46042, CVE-2026-46043, CVE-2026-46044,     CVE-2026-46045, CVE-2026-46046, CVE-2026-46047, CVE-2026-46048, CVE-2026-46049, CVE-2026-46050,     CVE-2026-46051, CVE-2026-46052, CVE-2026-46053, CVE-2026-46054, CVE-2026-46056, CVE-2026-46057,     CVE-2026-46058, CVE-2026-46059, CVE-2026-46060, CVE-2026-46061, CVE-2026-46062, CVE-2026-46063,     CVE-2026-46064, CVE-2026-46065, CVE-2026-46066, CVE-2026-46067, CVE-2026-46068, CVE-2026-46069,     CVE-2026-46070, CVE-2026-46071, CVE-2026-46072, CVE-2026-46073, CVE-2026-46074, CVE-2026-46075,     CVE-2026-46076, CVE-2026-46077, CVE-2026-46078, CVE-2026-46079, CVE-2026-46080, CVE-2026-46081,     CVE-2026-46082, CVE-2026-46083, CVE-2026-46084, CVE-2026-46085, CVE-2026-46086, CVE-2026-46087,     CVE-2026-46088, CVE-2026-46089, CVE-2026-46090, CVE-2026-46091, CVE-2026-46092, CVE-2026-46093,     CVE-2026-46094, CVE-2026-46095, CVE-2026-46096, CVE-2026-46097, CVE-2026-46098, CVE-2026-46099,     CVE-2026-46100, CVE-2026-46101, CVE-2026-46102, CVE-2026-46103, CVE-2026-46115, CVE-2026-46119,     CVE-2026-46135, CVE-2026-46137, CVE-2026-46155, CVE-2026-46185, CVE-2026-46195, CVE-2026-46243,     CVE-2026-46244, CVE-2026-46276, CVE-2026-46277, CVE-2026-46278, CVE-2026-46279, CVE-2026-46280,     CVE-2026-46281, CVE-2026-46282, CVE-2026-46283, CVE-2026-46284, CVE-2026-46285, CVE-2026-46286,     CVE-2026-46287, CVE-2026-46288, CVE-2026-46289, CVE-2026-46316, CVE-2026-46323, CVE-2026-46332,     CVE-2026-52904, CVE-2026-52905, CVE-2026-52906, CVE-2026-52907, CVE-2026-52933, CVE-2026-53174)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - x86/shstk: Prevent deadlock during shstk sigreturn During sigreturn the shadow stack signal frame is     popped. The kernel does this by reading the shadow stack using normal read accesses. When it can't assume     the memory is shadow stack, it takes extra steps to makes sure it is reading actual shadow stack memory     and not other normal readable memory. It does this by holding the mmap read lock while doing the access     and checking the flags of the VMA. Unfortunately that is not safe. If the read of the shadow stack     sigframe hits a page fault, the fault handler will try to recursively grab another mmap read lock. This     normally works ok, but if a writer on another CPU is also waiting, the second read lock could fail and     cause a deadlock. Fix this by not holding mmap lock during the read access to userspace. Instead use     mmap_lock_speculate_...() to watch for changes between dropping mmap lock and the userspace access. Retry     if anything grabbed an mmap write lock in between and could have changed the VMA. These     mmap_lock_speculate_...() helpers use mm::mm_lock_seq, which is only available when PER_VMA_LOCK is     configured. So make X86_USER_SHADOW_STACK depend on it. On x86, PER_VMA_LOCK is a default configuration     for SMP kernels. So drop support for the other configs under the assumption that the !SMP shadow stack     user base does not exist. Currently there is a check that skips the lookup work when the SSP can be     assumed to be on a shadow stack. While reorganizing the function, remove the optimization to make the     tricky code flows more common, such that issues like this cannot escape detection for so long.
    (CVE-2026-46063)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
326000	SUSE SLED15: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:2800-1)	Nessus	SuSE Local Security Checks	high
325421	Ubuntu 26.04 LTS : Linux kernel (NVIDIA) vulnerabilities (USN-8507-1)	Nessus	Ubuntu Local Security Checks	low
325017	Ubuntu 26.04 LTS : Linux kernel vulnerabilities (USN-8488-1)	Nessus	Ubuntu Local Security Checks	low
325016	Ubuntu 26.04 LTS : Linux kernel (OEM) vulnerabilities (USN-8489-1)	Nessus	Ubuntu Local Security Checks	high
317355	Linux Distros Unpatched Vulnerability : CVE-2026-46063	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-46063

medium

Tenable Plugins

high

low

low

high

medium