The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8243-1 advisory.

    Qualys discovered that several vulnerabilities existed in the AppArmor Linux kernel Security Module (LSM).
    An unprivileged local attacker could use these issues to load, replace, and remove arbitrary AppArmor     profiles causing denial of service, exposure of sensitive information (kernel memory), local privilege     escalation, or possibly escape a container. (LP: #2143853, CVE-2026-23268, CVE-2026-23269, CVE-2026-23403,     CVE-2026-23404, CVE-2026-23405, CVE-2026-23406, CVE-2026-23407, CVE-2026-23408, CVE-2026-23409,     CVE-2026-23410, CVE-2026-23411)

    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;

    - Nios II architecture;

    - PowerPC architecture;

    - Sun Sparc architecture;

    - User-Mode Linux (UML);

    - x86 architecture;

    - Block layer subsystem;

    - Cryptographic API;

    - ACPI drivers;

    - ATM drivers;

    - Drivers core;

    - Network block device driver;

    - Bluetooth drivers;

    - Bus devices;

    - Character device driver;

    - Hardware random number generator core;

    - TPM device driver;

    - Data acquisition framework and drivers;

    - Counter interface drivers;

    - CPU frequency scaling framework;

    - DMA engine subsystem;

    - Intel Stratix 10 firmware drivers;

    - GPU drivers;

    - HID subsystem;

    - Hardware monitoring drivers;

    - CoreSight HW tracing drivers;

    - Intel Trace Hub HW tracing drivers;

    - IIO subsystem;

    - IIO ADC drivers;

    - InfiniBand drivers;

    - Input Device core drivers;

    - Input Device (Miscellaneous) drivers;

    - Input Device (Tablet) drivers;

    - IRQ chip drivers;

    - ISDN/mISDN subsystem;

    - Modular ISDN driver;

    - LED subsystem;

    - Macintosh device drivers;

    - Multiple devices driver;

    - Media drivers;

    - UACCE accelerator framework;

    - MOST (Media Oriented Systems Transport) drivers;

    - MTD block device drivers;

    - Ethernet bonding driver;

    - Network drivers;

    - Mellanox network drivers;

    - STMicroelectronics network drivers;

    - Texas Instruments network drivers;

    - Ethernet team driver;

    - MediaTek network drivers;

    - NVME drivers;

    - PA-RISC drivers;

    - PCI subsystem;

    - Performance monitor drivers;

    - PHY drivers;

    - Pin controllers subsystem;

    - Chrome hardware platform drivers;

    - x86 platform drivers;

    - ARM PM domains;

    - PPS (Pulse Per Second) driver;

    - PWM drivers;

    - Voltage and Current Regulator drivers;

    - S/390 drivers;

    - SCSI subsystem;

    - SLIMbus drivers;

    - Texas Instruments SoC drivers;

    - SPI subsystem;

    - Realtek RTL8723BS SDIO drivers;

    - TCM subsystem;

    - Userspace I/O drivers;

    - Cadence USB3 driver;

    - DesignWare USB3 driver;

    - USB Gadget drivers;

    - USB Host Controller drivers;

    - Renesas USBHS Controller drivers;

    - USB Mass Storage drivers;

    - USB Type-C Connector System Software Interface driver;

    - Backlight driver;

    - Framebuffer layer;

    - W1 Dallas's 1-wire bus driver;

    - Watchdog drivers;

    - Xen hypervisor drivers;

    - BFS file system;

    - BTRFS file system;

    - File systems infrastructure;

    - Ext4 file system;

    - F2FS file system;

    - FUSE (File system in Userspace);

    - HFS file system;

    - HFS+ file system;

    - HugeTLB file system;

    - Journaling layer for block devices (JBD2);

    - JFS file system;

    - Network file system (NFS) client;

    - Network file system (NFS) server daemon;

    - File system notification infrastructure;

    - NTFS3 file system;

    - OCFS2 file system;

    - OrangeFS file system;

    - Proc file system;

    - SMB network file system;

    - SquashFS file system;

    - UDF file system;

    - XFS file system;

    - BPF subsystem;

    - Ethernet bridge;

    - Memory management;

    - padata parallel execution mechanism;

    - IP tunnels definitions;

    - NFC subsystem;

    - Network traffic control;

    - Network sockets;

    - XFRM subsystem;

    - io_uring subsystem;

    - Control group (cgroup);

    - IRQ subsystem;

    - Locking primitives;

    - Padata parallel execution mechanism;

    - PID allocator;

    - Scheduler infrastructure;

    - Shadow Call Stack mechanism;

    - Tracing infrastructure;

    - 9P file system network protocol;

    - Bluetooth subsystem;

    - CAIF protocol;

    - CAN network layer;

    - Ceph Core library;

    - Networking core;

    - Ethtool driver;

    - HSR network protocol;

    - IPv4 networking;

    - IPv6 networking;

    - L2TP protocol;

    - MAC80211 subsystem;

    - Multipath TCP;

    - Netfilter;

    - NET/ROM layer;

    - Open vSwitch;

    - RF switch subsystem;

    - Rose network layer;

    - SCTP protocol;

    - Sun RPC protocol;

    - TIPC protocol;

    - TLS protocol;

    - Unix domain sockets;

    - VMware vSockets driver;

    - Wireless networking;

    - Rust bindings mechanism;

    - Integrity Measurement Architecture(IMA) framework;

    - Key management;

    - Simplified Mandatory Access Control Kernel framework;

    - FireWire sound drivers;

    - Turtle Beach Wavefront ALSA driver;

    - Creative Sound Blaster X-Fi driver;

    - Intel ASoC drivers;

    - STMicroelectronics SoC drivers;

    - USB sound devices; (CVE-2022-49465, CVE-2022-49635, CVE-2023-53421, CVE-2023-53520, CVE-2023-53662,     CVE-2023-54207, CVE-2024-36903, CVE-2024-36927, CVE-2024-37354, CVE-2024-41014, CVE-2024-46830,     CVE-2024-47666, CVE-2024-49968, CVE-2024-53114, CVE-2024-56538, CVE-2024-58011, CVE-2025-21780,     CVE-2025-21861, CVE-2025-22022, CVE-2025-22058, CVE-2025-22111, CVE-2025-22121, CVE-2025-23143,     CVE-2025-37849, CVE-2025-38022, CVE-2025-38057, CVE-2025-38125, CVE-2025-38129, CVE-2025-38232,     CVE-2025-38236, CVE-2025-38248, CVE-2025-38408, CVE-2025-38556, CVE-2025-38584, CVE-2025-38591,     CVE-2025-39869, CVE-2025-39873, CVE-2025-39876, CVE-2025-39880, CVE-2025-39883, CVE-2025-39885,     CVE-2025-39907, CVE-2025-39911, CVE-2025-39913, CVE-2025-39923, CVE-2025-39934, CVE-2025-39937,     CVE-2025-39943, CVE-2025-39945, CVE-2025-39949, CVE-2025-39951, CVE-2025-39953, CVE-2025-39955,     CVE-2025-39967, CVE-2025-39968, CVE-2025-39969, CVE-2025-39970, CVE-2025-39971, CVE-2025-39972,     CVE-2025-39973, CVE-2025-39980, CVE-2025-39985, CVE-2025-39986, CVE-2025-39987, CVE-2025-39988,     CVE-2025-39994, CVE-2025-39995, CVE-2025-39996, CVE-2025-39998, CVE-2025-40001, CVE-2025-40006,     CVE-2025-40011, CVE-2025-40020, CVE-2025-40021, CVE-2025-40026, CVE-2025-40027, CVE-2025-40029,     CVE-2025-40030, CVE-2025-40035, CVE-2025-40040, CVE-2025-40042, CVE-2025-40043, CVE-2025-40044,     CVE-2025-40048, CVE-2025-40049, CVE-2025-40053, CVE-2025-40055, CVE-2025-40060, CVE-2025-40068,     CVE-2025-40070, CVE-2025-40078, CVE-2025-40081, CVE-2025-40083, CVE-2025-40085, CVE-2025-40087,     CVE-2025-40088, CVE-2025-40092, CVE-2025-40094, CVE-2025-40105, CVE-2025-40106, CVE-2025-40109,     CVE-2025-40110, CVE-2025-40111, CVE-2025-40112, CVE-2025-40115, CVE-2025-40116, CVE-2025-40118,     CVE-2025-40120, CVE-2025-40121, CVE-2025-40124, CVE-2025-40125, CVE-2025-40126, CVE-2025-40127,     CVE-2025-40134, CVE-2025-40140, CVE-2025-40149, CVE-2025-40153, CVE-2025-40154, CVE-2025-40164,     CVE-2025-40167, CVE-2025-40171, CVE-2025-40173, CVE-2025-40178, CVE-2025-40179, CVE-2025-40183,     CVE-2025-40187, CVE-2025-40188, CVE-2025-40194, CVE-2025-40200, CVE-2025-40204, CVE-2025-40205,     CVE-2025-40211, CVE-2025-40215, CVE-2025-40219, CVE-2025-40220, CVE-2025-40223, CVE-2025-40231,     CVE-2025-40233, CVE-2025-40240, CVE-2025-40243, CVE-2025-40244, CVE-2025-40245, CVE-2025-40248,     CVE-2025-40252, CVE-2025-40253, CVE-2025-40254, CVE-2025-40257, CVE-2025-40258, CVE-2025-40259,     CVE-2025-40261, CVE-2025-40262, CVE-2025-40263, CVE-2025-40264, CVE-2025-40269, CVE-2025-40271,     CVE-2025-40272, CVE-2025-40273, CVE-2025-40275, CVE-2025-40277, CVE-2025-40278, CVE-2025-40279,     CVE-2025-40280, CVE-2025-40281, CVE-2025-40282, CVE-2025-40283, CVE-2025-40304, CVE-2025-40306,     CVE-2025-40308, CVE-2025-40309, CVE-2025-40312, CVE-2025-40313, CVE-2025-40314, CVE-2025-40315,     CVE-2025-40317, CVE-2025-40319, CVE-2025-40321, CVE-2025-40322, CVE-2025-40324, CVE-2025-40331,     CVE-2025-40342, CVE-2025-40343, CVE-2025-40345, CVE-2025-40346, CVE-2025-40349, CVE-2025-40351,     CVE-2025-40360, CVE-2025-40363, CVE-2025-68168, CVE-2025-68176, CVE-2025-68177, CVE-2025-68185,     CVE-2025-68191, CVE-2025-68192, CVE-2025-68194, CVE-2025-68200, CVE-2025-68204, CVE-2025-68211,     CVE-2025-68217, CVE-2025-68220, CVE-2025-68227, CVE-2025-68229, CVE-2025-68238, CVE-2025-68241,     CVE-2025-68244, CVE-2025-68245, CVE-2025-68249, CVE-2025-68254, CVE-2025-68255, CVE-2025-68257,     CVE-2025-68258, CVE-2025-68261, CVE-2025-68264, CVE-2025-68266, CVE-2025-68282, CVE-2025-68284,     CVE-2025-68285, CVE-2025-68286, CVE-2025-68287, CVE-2025-68288, CVE-2025-68289, CVE-2025-68290,     CVE-2025-68295, CVE-2025-68301, CVE-2025-68302, CVE-2025-68303, CVE-2025-68308, CVE-2025-68312,     CVE-2025-68321, CVE-2025-68325, CVE-2025-68327, CVE-2025-68328, CVE-2025-68330, CVE-2025-68331,     CVE-2025-68332, CVE-2025-68335, CVE-2025-68336, CVE-2025-68337, CVE-2025-68339, CVE-2025-68340,     CVE-2025-68344, CVE-2025-68346, CVE-2025-68349, CVE-2025-68354, CVE-2025-68362, CVE-2025-68364,     CVE-2025-68365, CVE-2025-68366, CVE-2025-68367, CVE-2025-68372, CVE-2025-68724, CVE-2025-68725,     CVE-2025-68727, CVE-2025-68728, CVE-2025-68732, CVE-2025-68733, CVE-2025-68734, CVE-2025-68740,     CVE-2025-68746, CVE-2025-68757, CVE-2025-68758, CVE-2025-68759, CVE-2025-68764, CVE-2025-68765,     CVE-2025-68767, CVE-2025-68769, CVE-2025-68771, CVE-2025-68774, CVE-2025-68776, CVE-2025-68777,     CVE-2025-68780, CVE-2025-68782, CVE-2025-68783, CVE-2025-68785, CVE-2025-68787, CVE-2025-68788,     CVE-2025-68795, CVE-2025-68796, CVE-2025-68797, CVE-2025-68799, CVE-2025-68800, CVE-2025-68801,     CVE-2025-68803, CVE-2025-68804, CVE-2025-68808, CVE-2025-68813, CVE-2025-68814, CVE-2025-68815,     CVE-2025-68816, CVE-2025-68817, CVE-2025-68818, CVE-2025-68819, CVE-2025-68820, CVE-2025-71064,     CVE-2025-71066, CVE-2025-71068, CVE-2025-71069, CVE-2025-71075, CVE-2025-71077, CVE-2025-71078,     CVE-2025-71079, CVE-2025-71081, CVE-2025-71082, CVE-2025-71083, CVE-2025-71084, CVE-2025-71085,     CVE-2025-71086, CVE-2025-71087, CVE-2025-71091, CVE-2025-71093, CVE-2025-71094, CVE-2025-71096,     CVE-2025-71097, CVE-2025-71098, CVE-2025-71102, CVE-2025-71104, CVE-2025-71105, CVE-2025-71108,     CVE-2025-71111, CVE-2025-71112, CVE-2025-71113, CVE-2025-71114, CVE-2025-71116, CVE-2025-71118,     CVE-2025-71120, CVE-2025-71121, CVE-2025-71125, CVE-2025-71127, CVE-2025-71131, CVE-2025-71132,     CVE-2025-71133, CVE-2025-71136, CVE-2025-71137, CVE-2025-71147, CVE-2025-71154, CVE-2025-71162,     CVE-2025-71163, CVE-2025-71180, CVE-2025-71182, CVE-2025-71185, CVE-2025-71186, CVE-2025-71188,     CVE-2025-71190, CVE-2025-71191, CVE-2025-71194, CVE-2025-71196, CVE-2025-71197, CVE-2025-71199,     CVE-2026-22976, CVE-2026-22977, CVE-2026-22978, CVE-2026-22980, CVE-2026-22982, CVE-2026-22984,     CVE-2026-22990, CVE-2026-22991, CVE-2026-22992, CVE-2026-22997, CVE-2026-22998, CVE-2026-22999,     CVE-2026-23001, CVE-2026-23003, CVE-2026-23011, CVE-2026-23019, CVE-2026-23020, CVE-2026-23021,     CVE-2026-23026, CVE-2026-23033, CVE-2026-23037, CVE-2026-23038, CVE-2026-23047, CVE-2026-23049,     CVE-2026-23056, CVE-2026-23058, CVE-2026-23060, CVE-2026-23061, CVE-2026-23063, CVE-2026-23064,     CVE-2026-23071, CVE-2026-23073, CVE-2026-23074, CVE-2026-23075, CVE-2026-23076, CVE-2026-23078,     CVE-2026-23080, CVE-2026-23083, CVE-2026-23084, CVE-2026-23085, CVE-2026-23087, CVE-2026-23089,     CVE-2026-23090, CVE-2026-23091, CVE-2026-23093, CVE-2026-23095, CVE-2026-23096, CVE-2026-23097,     CVE-2026-23098, CVE-2026-23099, CVE-2026-23101, CVE-2026-23103, CVE-2026-23105, CVE-2026-23108,     CVE-2026-23111, CVE-2026-23119, CVE-2026-23120, CVE-2026-23121, CVE-2026-23124, CVE-2026-23125,     CVE-2026-23128, CVE-2026-23133, CVE-2026-23146, CVE-2026-23150, CVE-2026-23164, CVE-2026-23167,     CVE-2026-23170, CVE-2026-23209)

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.

  - ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() There exists a kernel oops caused by     a BUG_ON(nhead < 0) at net/core/skbuff.c:2232 in pskb_expand_head(). This bug is triggered as part of the     calipso_skbuff_setattr() routine when skb_cow() is passed headroom > INT_MAX (i.e. (int)(skb_headroom(skb)     + len_delta) < 0). The root cause of the bug is due to an implicit integer cast in __skb_cow(). The check     (headroom > skb_headroom(skb)) is meant to ensure that delta = headroom - skb_headroom(skb) is never     negative, otherwise we will trigger a BUG_ON in pskb_expand_head(). However, if headroom > INT_MAX and     delta <= -NET_SKB_PAD, the check passes, delta becomes negative, and pskb_expand_head() is passed a     negative value for nhead. Fix the trigger condition in calipso_skbuff_setattr(). Avoid passing negative     headroom sizes to skb_cow() within calipso_skbuff_setattr() by only using skb_cow() to grow headroom. PoC:
    Using `netlabelctl` tool: netlabelctl map del default netlabelctl calipso add pass doi:7 netlabelctl map     add default address:0::1/128 protocol:calipso,7 Then run the following PoC: int fd = socket(AF_INET6,     SOCK_DGRAM, IPPROTO_UDP); // setup msghdr int cmsg_size = 2; int cmsg_len = 0x60; struct msghdr msg;
    struct sockaddr_in6 dest_addr; struct cmsghdr * cmsg = (struct cmsghdr *) calloc(1, sizeof(struct cmsghdr)     + cmsg_len); msg.msg_name = &dest_addr; msg.msg_namelen = sizeof(dest_addr); msg.msg_iov = NULL;
    msg.msg_iovlen = 0; msg.msg_control = cmsg; msg.msg_controllen = cmsg_len; msg.msg_flags = 0; // setup     sockaddr dest_addr.sin6_family = AF_INET6; dest_addr.sin6_port = htons(31337); dest_addr.sin6_flowinfo =     htonl(31337); dest_addr.sin6_addr = in6addr_loopback; dest_addr.sin6_scope_id = 31337; // setup cmsghdr     cmsg->cmsg_len = cmsg_len; cmsg->cmsg_level = IPPROTO_IPV6; cmsg->cmsg_type = IPV6_HOPOPTS; char * hop_hdr     = (char *)cmsg + sizeof(struct cmsghdr); hop_hdr[1] = 0x9; //set hop size - (0x9 + 1) * 8 = 80 sendmsg(fd,     &msg, 0); (CVE-2025-71085)

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

ID	Name	Product	Family	Published	Updated	Severity
314224	Ubuntu 20.04 LTS : Linux kernel (Azure) vulnerabilities (USN-8243-1)	Nessus	Ubuntu Local Security Checks	5/11/2026	5/11/2026	high
283656	Linux Distros Unpatched Vulnerability : CVE-2025-71085	Nessus	Misc.	1/13/2026	5/13/2026	medium

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