The mbcache feature in the ext2 and ext4 filesystem implementations in the Linux kernel before 4.6 mishandles xattr block caching, which allows local users to cause a denial of service (soft lockup) via filesystem operations in environments that use many attributes, as demonstrated by Ceph and Samba.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-000946 advisory.

    The mbcache feature in the ext2 and ext4 filesystem implementations in the Linux kernel before 4.6     mishandles xattr block caching, which allows local users to cause a denial of service (soft lockup) via     filesystem operations in environments that use many attributes, as demonstrated by Ceph and Samba.

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

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-001848 advisory.

    The mbcache feature in the ext2 and ext4 filesystem implementations in the Linux kernel before 4.6     mishandles xattr block caching, which allows local users to cause a denial of service (soft lockup) via     filesystem operations in environments that use many attributes, as demonstrated by Ceph and Samba.

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

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-002074 advisory.

    The mbcache feature in the ext2 and ext4 filesystem implementations in the Linux kernel before 4.6     mishandles xattr block caching, which allows local users to cause a denial of service (soft lockup) via     filesystem operations in environments that use many attributes, as demonstrated by Ceph and Samba.

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

Note that Nessus has not tested for this issue 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.

  - The mbcache feature in the ext2 and ext4 filesystem implementations in the Linux kernel before 4.6     mishandles xattr block caching, which allows local users to cause a denial of service (soft lockup) via     filesystem operations in environments that use many attributes, as demonstrated by Ceph and Samba.
    (CVE-2015-8952)

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

According to the versions of the kernel packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - A use-after-free vulnerability was found in DCCP socket     code affecting the Linux kernel since 2.6.16. This     vulnerability could allow an attacker to their escalate     privileges.(CVE-2017-8824i1/4%0

  - The OZWPAN driver in the Linux kernel through 4.0.5     relies on an untrusted length field during packet     parsing, which allows remote attackers to obtain     sensitive information from kernel memory or cause a     denial of service (out-of-bounds read and system crash)     via a crafted packet.(CVE-2015-4004i1/4%0

  - Integer signedness error in the MSM V4L2 video driver     for the Linux kernel 3.x, as used in Qualcomm     Innovation Center (QuIC) Android contributions for MSM     devices and other products, allows attackers to gain     privileges or cause a denial of service (array overflow     and memory corruption) via a crafted application that     triggers an msm_isp_axi_create_stream     call.(CVE-2016-2061i1/4%0

  - A denial of service flaw was found in the way the Linux     kernel's XFS file system implementation ordered     directory hashes under certain conditions. A local     attacker could use this flaw to corrupt the file system     by creating directories with colliding hash values,     potentially resulting in a system     crash.(CVE-2014-7283i1/4%0

  - It was found that the Linux kernel's ping socket     implementation did not properly handle socket unhashing     during spurious disconnects, which could lead to a     use-after-free flaw. On x86-64 architecture systems, a     local user able to create ping sockets could use this     flaw to crash the system. On non-x86-64 architecture     systems, a local user able to create ping sockets could     use this flaw to escalate their privileges on the     system.(CVE-2015-3636i1/4%0

  - Incorrect buffer length handling was found in the     ncp_read_kernel function in fs/ncpfs/ncplib_kernel.c in     the Linux kernel, which could be exploited by malicious     NCPFS servers to crash the kernel or possibly execute     an arbitrary code.(CVE-2018-8822i1/4%0

  - ** DISPUTED ** Kernel Samepage Merging (KSM) in the     Linux kernel 2.6.32 through 4.x does not prevent use of     a write-timing side channel, which allows guest OS     users to defeat the ASLR protection mechanism on other     guest OS instances via a Cross-VM ASL INtrospection     (CAIN) attack. NOTE: the vendor states 'Basically if     you care about this attack vector, disable     deduplication.' Share-until-written approaches for     memory conservation among mutually untrusting tenants     are inherently detectable for information disclosure,     and can be classified as potentially misunderstood     behaviors rather than vulnerabilities.(CVE-2015-2877i1/4%0

  - The tty_set_termios_ldisc() function in     'drivers/tty/tty_ldisc.c' in the Linux kernel before     4.5 allows local users to obtain sensitive information     from kernel memory by reading a tty data     structure.(CVE-2015-8964i1/4%0

  - An issue was discovered in the Linux kernel through     4.17.2. vbg_misc_device_ioctl() in     drivers/virt/vboxguest/vboxguest_linux.c reads the same     user data twice with copy_from_user. The header part of     the user data is double-fetched, and a malicious user     thread can tamper with the critical variables     (hdr.size_in and hdr.size_out) in the header between     the two fetches because of a race condition, leading to     severe kernel errors, such as buffer over-accesses.
    This bug can cause a local denial of service and     information leakage.(CVE-2018-12633i1/4%0

  - ** RESERVED ** This candidate has been reserved by an     organization or individual that will use it when     announcing a new security problem. When the candidate     has been publicized, the details for this candidate     will be provided.(CVE-2018-1092i1/4%0

  - fs/f2fs/extent_cache.c in the Linux kernel, before     4.13, mishandles extent trees. This allows local users     to cause a denial of service via an application with     multiple threads.(CVE-2017-18193i1/4%0

  - A design flaw was found in the file extended attribute     handling of the Linux kernel's handling of cached     attributes. Too many entries in the cache cause a soft     lockup while attempting to iterate the cache and access     relevant locks.(CVE-2015-8952i1/4%0

  - Off-by-one error in the pipe_advance function in     lib/iov_iter.c in the Linux kernel before 4.9.5 allows     local users to obtain sensitive information from     uninitialized heap-memory locations in opportunistic     circumstances by reading from a pipe after an incorrect     buffer-release decision.(CVE-2017-5550i1/4%0

  - The HMAC implementation (crypto/hmac.c) in the Linux     kernel, before 4.14.8, does not validate that the     underlying cryptographic hash algorithm is unkeyed.
    This allows a local attacker, able to use the     AF_ALG-based hash interface     (CONFIG_CRYPTO_USER_API_HASH) and the SHA-3 hash     algorithm (CONFIG_CRYPTO_SHA3), to cause a kernel stack     buffer overflow by executing a crafted sequence of     system calls that encounter a missing SHA-3     initialization.(CVE-2017-17806i1/4%0

  - The mp_get_count function in     drivers/staging/sb105x/sb_pci_mp.c in the Linux kernel     before 3.12 does not initialize a certain data     structure, which allows local users to obtain sensitive     information from kernel stack memory via a TIOCGICOUNT     ioctl call.(CVE-2013-4516i1/4%0

  - The perf_cpu_time_max_percent_handler function in     kernel/events/core.c in the Linux kernel before 4.11     allows local users to cause a denial of service     (integer overflow) or possibly have unspecified other     impact via a large value, as demonstrated by an     incorrect sample-rate calculation.(CVE-2017-18255i1/4%0

  - An issue was discovered in the btrfs filesystem code in     the Linux kernel. An invalid pointer dereference in
    __del_reloc_root() in fs/btrfs/relocation.c when     mounting a crafted btrfs image could lead to a system     crash and a denial of service.(CVE-2018-14609i1/4%0

  - The oz_usb_handle_ep_data function in     drivers/staging/ozwpan/ozusbsvc1.c in the OZWPAN driver     in the Linux kernel through 4.0.5 allows remote     attackers to cause a denial of service (divide-by-zero     error and system crash) via a crafted     packet.(CVE-2015-4003i1/4%0

  - drivers/hid/hid-logitech-dj.c in the Human Interface     Device (HID) subsystem in the Linux kernel through     3.11, when CONFIG_HID_LOGITECH_DJ is enabled, allows     physically proximate attackers to cause a denial of     service (NULL pointer dereference and OOPS) or obtain     sensitive information from kernel memory via a crafted     device.(CVE-2013-2895i1/4%0

  - drivers/usb/serial/cypress_m8.c in the Linux kernel     before 4.5.1 allows physically proximate attackers to     cause a denial of service (NULL pointer dereference and     system crash) via a USB device without both an     interrupt-in and an interrupt-out endpoint descriptor,     related to the cypress_generic_port_probe and     cypress_open functions.(CVE-2016-3137i1/4%0

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3582-2 advisory.

    USN-3582-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the     corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu     14.04 LTS.

    Mohamed Ghannam discovered that the IPv4 raw socket implementation in the Linux kernel contained a race     condition leading to uninitialized pointer usage. A local attacker could use this to cause a denial of     service or possibly execute arbitrary code. (CVE-2017-17712)

    Laurent Guerby discovered that the mbcache feature in the ext2 and ext4 filesystems in the Linux kernel     improperly handled xattr block caching. A local attacker could use this to cause a denial of service.
    (CVE-2015-8952)

    Vitaly Mayatskikh discovered that the SCSI subsystem in the Linux kernel did not properly track reference     counts when merging buffers. A local attacker could use this to cause a denial of service (memory     exhaustion). (CVE-2017-12190)

    ChunYu Wang discovered that a use-after-free vulnerability existed in the SCTP protocol implementation in     the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly     execute arbitrary code, (CVE-2017-15115)

    Mohamed Ghannam discovered a use-after-free vulnerability in the DCCP protocol implementation in the Linux     kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute     arbitrary code. (CVE-2017-8824)

    USN-3540-2 mitigated CVE-2017-5715 (Spectre Variant 2) for the amd64 architecture in Ubuntu 14.04 LTS.
    This update provides the compiler-based retpoline kernel mitigation for the amd64 and i386 architectures.

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 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3582-1 advisory.

    Mohamed Ghannam discovered that the IPv4 raw socket implementation in the Linux kernel contained a race     condition leading to uninitialized pointer usage. A local attacker could use this to cause a denial of     service or possibly execute arbitrary code. (CVE-2017-17712)

    Laurent Guerby discovered that the mbcache feature in the ext2 and ext4 filesystems in the Linux kernel     improperly handled xattr block caching. A local attacker could use this to cause a denial of service.
    (CVE-2015-8952)

    Vitaly Mayatskikh discovered that the SCSI subsystem in the Linux kernel did not properly track reference     counts when merging buffers. A local attacker could use this to cause a denial of service (memory     exhaustion). (CVE-2017-12190)

    ChunYu Wang discovered that a use-after-free vulnerability existed in the SCTP protocol implementation in     the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly     execute arbitrary code, (CVE-2017-15115)

    Mohamed Ghannam discovered a use-after-free vulnerability in the DCCP protocol implementation in the Linux     kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute     arbitrary code. (CVE-2017-8824)

    USN-3540-1 mitigated CVE-2017-5715 (Spectre Variant 2) for the amd64 architecture in Ubuntu 16.04 LTS.
    This update provides the compiler-based retpoline kernel mitigation for the amd64 and i386 architectures.

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 OracleVM system is missing necessary patches to address critical security updates :

  - Revert 'x86/mm: Expand the exception table logic to     allow new handling options' (Brian Maly) [Orabug:
    25790387] (CVE-2016-9644)

  - Revert 'fix minor infoleak in get_user_ex' (Brian Maly)     [Orabug: 25790387] (CVE-2016-9644)

  - x86/mm: Expand the exception table logic to allow new     handling options (Tony Luck) [Orabug: 25790387]     (CVE-2016-9644)

  - rebuild bumping release

  - net: ping: check minimum size on ICMP header length     (Kees Cook) [Orabug: 25766898] (CVE-2016-8399)     (CVE-2016-8399)

  - sg_write/bsg_write is not fit to be called under     KERNEL_DS (Al Viro) [Orabug: 25765436] (CVE-2016-10088)

  - scsi: sg: check length passed to SG_NEXT_CMD_LEN (peter     chang) [Orabug: 25751984] (CVE-2017-7187)

  - tty: n_hdlc: get rid of racy n_hdlc.tbuf (Alexander     Popov) [Orabug: 25696677] (CVE-2017-2636)

  - TTY: n_hdlc, fix lockdep false positive (Jiri Slaby)     [Orabug: 25696677] (CVE-2017-2636)

  - If Slot Status indicates changes in both Data Link Layer     Status and Presence Detect, prioritize the Link status     change. (Jack Vogel) 

  - PCI: pciehp: Leave power indicator on when enabling     already-enabled slot (Ashok Raj) [Orabug: 25353783]

  - firewire: net: guard against rx buffer overflows (Stefan     Richter) [Orabug: 25451520] (CVE-2016-8633)

  - usbnet: cleanup after bind in probe (Oliver Neukum)     [Orabug: 25463898] (CVE-2016-3951)

  - cdc_ncm: do not call usbnet_link_change from     cdc_ncm_bind (Bj&oslash rn Mork) [Orabug: 25463898]     (CVE-2016-3951)

  - cdc_ncm: Add support for moving NDP to end of NCM frame     (Enrico Mioso) [Orabug: 25463898] (CVE-2016-3951)

  - x86/mm/32: Enable full randomization on i386 and X86_32     (Hector Marco-Gisbert) [Orabug: 25463918]     (CVE-2016-3672)

  - kvm: fix page struct leak in handle_vmon (Paolo Bonzini)     [Orabug: 25507133] (CVE-2017-2596)

  - crypto: mcryptd - Check mcryptd algorithm compatibility     (tim) [Orabug: 25507153] (CVE-2016-10147)

  - kvm: nVMX: Allow L1 to intercept software exceptions     (#BP and #OF) (Jim Mattson) [Orabug: 25507188]     (CVE-2016-9588)

  - KVM: x86: drop error recovery in em_jmp_far and     em_ret_far (Radim Kr&#x10D m&aacute &#x159 ) [Orabug:
    25507213] (CVE-2016-9756)

  - tcp: take care of truncations done by sk_filter (Eric     Dumazet) [Orabug: 25507226] (CVE-2016-8645)

  - rose: limit sk_filter trim to payload (Willem de Bruijn)     [Orabug: 25507226] (CVE-2016-8645)

  - tipc: check minimum bearer MTU (Michal Kube&#x10D ek)     [Orabug: 25507239] (CVE-2016-8632) (CVE-2016-8632)

  - fix minor infoleak in get_user_ex (Al Viro) [Orabug:
    25507269] (CVE-2016-9178)

  - scsi: arcmsr: Simplify user_len checking (Borislav     Petkov) [Orabug: 25507319] (CVE-2016-7425)

  - scsi: arcmsr: Buffer overflow in arcmsr_iop_message_xfer     (Dan Carpenter) [Orabug: 25507319] (CVE-2016-7425)

  - tmpfs: clear S_ISGID when setting posix ACLs (Gu Zheng)     [Orabug: 25507341] (CVE-2016-7097) (CVE-2016-7097)

  - posix_acl: Clear SGID bit when setting file permissions     (Jan Kara) [Orabug: 25507341] (CVE-2016-7097)     (CVE-2016-7097)

  - ext2: convert to mbcache2 (Jan Kara) [Orabug: 25512366]     (CVE-2015-8952)

  - ext4: convert to mbcache2 (Jan Kara) [Orabug: 25512366]     (CVE-2015-8952)

  - mbcache2: reimplement mbcache (Jan Kara) [Orabug:
    25512366] (CVE-2015-8952)

  - USB: digi_acceleport: do sanity checking for the number     of ports (Oliver Neukum) [Orabug: 25512466]     (CVE-2016-3140)

  - net/llc: avoid BUG_ON in skb_orphan (Eric Dumazet)     [Orabug: 25682419] (CVE-2017-6345)

  - net/mlx4_core: Disallow creation of RAW QPs on a VF (Eli     Cohen) 

  - ipv4: keep skb->dst around in presence of IP options     (Eric Dumazet) [Orabug: 25698300] (CVE-2017-5970)

  - perf/core: Fix concurrent sys_perf_event_open vs.
    'move_group' race (Peter Zijlstra) [Orabug: 25698751]     (CVE-2017-6001)

  - ip6_gre: fix ip6gre_err invalid reads (Eric Dumazet)     [Orabug: 25699015] (CVE-2017-5897)

  - mpt3sas: Don't spam logs if logging level is 0 (Johannes     Thumshirn) 

  - xen-netfront: cast grant table reference first to type     int (Dongli Zhang)

  - xen-netfront: do not cast grant table reference to     signed short (Dongli Zhang)

The remote Oracle Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2017-3533 advisory.

    - Revert 'x86/mm: Expand the exception table logic to allow new handling options' (Brian Maly)  [Orabug:
    25790387]  {CVE-2016-9644}
    - Revert 'fix minor infoleak in get_user_ex()' (Brian Maly)  [Orabug: 25790387]  {CVE-2016-9644}
    - x86/mm: Expand the exception table logic to allow new handling options (Tony Luck)  [Orabug: 25790387]     {CVE-2016-9644}
    - net: ping: check minimum size on ICMP header length (Kees Cook)  [Orabug: 25766898]  {CVE-2016-8399}     {CVE-2016-8399}
    - sg_write()/bsg_write() is not fit to be called under KERNEL_DS (Al Viro)  [Orabug: 25765436]     {CVE-2016-10088}
    - scsi: sg: check length passed to SG_NEXT_CMD_LEN (peter chang)  [Orabug: 25751984]  {CVE-2017-7187}
    - tty: n_hdlc: get rid of racy n_hdlc.tbuf (Alexander Popov)  [Orabug: 25696677]  {CVE-2017-2636}
    - TTY: n_hdlc, fix lockdep false positive (Jiri Slaby)  [Orabug: 25696677]  {CVE-2017-2636}
    - firewire: net: guard against rx buffer overflows (Stefan Richter)  [Orabug: 25451520]  {CVE-2016-8633}
    - usbnet: cleanup after bind() in probe() (Oliver Neukum)  [Orabug: 25463898]  {CVE-2016-3951}
    - cdc_ncm: do not call usbnet_link_change from cdc_ncm_bind (Bjorn Mork)  [Orabug: 25463898]     {CVE-2016-3951}
    - cdc_ncm: Add support for moving NDP to end of NCM frame (Enrico Mioso)  [Orabug: 25463898]     {CVE-2016-3951}
    - x86/mm/32: Enable full randomization on i386 and X86_32 (Hector Marco-Gisbert)  [Orabug: 25463918]     {CVE-2016-3672}
    - kvm: fix page struct leak in handle_vmon (Paolo Bonzini)  [Orabug: 25507133]  {CVE-2017-2596}
    - crypto: mcryptd - Check mcryptd algorithm compatibility (tim)  [Orabug: 25507153]  {CVE-2016-10147}
    - kvm: nVMX: Allow L1 to intercept software exceptions (#BP and #OF) (Jim Mattson)  [Orabug: 25507188]     {CVE-2016-9588}
    - KVM: x86: drop error recovery in em_jmp_far and em_ret_far (Radim Krcmar)  [Orabug: 25507213]     {CVE-2016-9756}
    - tcp: take care of truncations done by sk_filter() (Eric Dumazet)  [Orabug: 25507226]  {CVE-2016-8645}
    - rose: limit sk_filter trim to payload (Willem de Bruijn)  [Orabug: 25507226]  {CVE-2016-8645}
    - tipc: check minimum bearer MTU (Michal Kubecek)  [Orabug: 25507239]  {CVE-2016-8632} {CVE-2016-8632}
    - fix minor infoleak in get_user_ex() (Al Viro)  [Orabug: 25507269]  {CVE-2016-9178}
    - scsi: arcmsr: Simplify user_len checking (Borislav Petkov)  [Orabug: 25507319]  {CVE-2016-7425}
    - scsi: arcmsr: Buffer overflow in arcmsr_iop_message_xfer() (Dan Carpenter)  [Orabug: 25507319]     {CVE-2016-7425}
    - tmpfs: clear S_ISGID when setting posix ACLs (Gu Zheng)  [Orabug: 25507341]  {CVE-2016-7097}     {CVE-2016-7097}
    - posix_acl: Clear SGID bit when setting file permissions (Jan Kara)  [Orabug: 25507341]  {CVE-2016-7097}     {CVE-2016-7097}
    - ext2: convert to mbcache2 (Jan Kara)  [Orabug: 25512366]  {CVE-2015-8952}
    - ext4: convert to mbcache2 (Jan Kara)  [Orabug: 25512366]  {CVE-2015-8952}
    - mbcache2: reimplement mbcache (Jan Kara)  [Orabug: 25512366]  {CVE-2015-8952}
    - USB: digi_acceleport: do sanity checking for the number of ports (Oliver Neukum)  [Orabug: 25512466]     {CVE-2016-3140}
    - net/llc: avoid BUG_ON() in skb_orphan() (Eric Dumazet)  [Orabug: 25682419]  {CVE-2017-6345}
    - ipv4: keep skb->dst around in presence of IP options (Eric Dumazet)  [Orabug: 25698300]  {CVE-2017-5970}
    - perf/core: Fix concurrent sys_perf_event_open() vs. 'move_group' race (Peter Zijlstra)  [Orabug:
    25698751]  {CVE-2017-6001}
    - ip6_gre: fix ip6gre_err() invalid reads (Eric Dumazet)  [Orabug: 25699015]  {CVE-2017-5897}

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

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

ID	Name	Product	Family	Severity
290484	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-000946)	Nessus	Unity Linux Local Security Checks	medium
286587	Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-001848)	Nessus	Unity Linux Local Security Checks	medium
286419	Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-002074)	Nessus	Unity Linux Local Security Checks	medium
219119	Linux Distros Unpatched Vulnerability : CVE-2015-8952	Nessus	Misc.	medium
124800	EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1476)	Nessus	Huawei Local Security Checks	high
106973	Ubuntu 14.04 LTS : Linux kernel (Xenial HWE) vulnerabilities (USN-3582-2)	Nessus	Ubuntu Local Security Checks	high
106972	Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-3582-1)	Nessus	Ubuntu Local Security Checks	high
99162	OracleVM 3.4 : Unbreakable / etc (OVMSA-2017-0056)	Nessus	OracleVM Local Security Checks	critical
99159	Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2017-3533)	Nessus	Oracle Linux Local Security Checks	critical

Detections

Analytics

CVE-2015-8952

medium

Tenable Plugins

medium

medium

medium

medium

high

high

high

critical

critical