In the Linux kernel, the following vulnerability has been resolved: futex: Drop CLONE_THREAD requirement for private default hash alloc Currently need_futex_hash_allocate_default() depends on strict pthread semantics, abusing CLONE_THREAD. This breaks the non-concurrency assumptions when doing the mm->futex_ref pcpu allocations, leading to bugs[0] when sharing the mm in other ways; ie: BUG: KASAN: slab-use-after-free in futex_hash_put ... where the +1 bias can end up on a percpu counter that mm->futex_ref no longer points at. Loosen the check to cover any CLONE_VM clone, except vfork(). Excluding vfork keeps the existing paths untouched (no overhead), and we can't race in the first place: either the parent is suspended and the child runs alone, or mm->futex_ref is already allocated from an earlier CLONE_VM.

The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:47040 advisory.

    * kernel: xfrm: Duplicate SPI Handling (CVE-2025-39797)
      * kernel: lib/buildid: use __kernel_read() for sleepable context (CVE-2026-23002)
      * kernel: futex: Drop CLONE_THREAD requirement for private default hash alloc (CVE-2026-52973)
      * kernel: iommu/vt-d: Avoid NULL pointer dereference or refcount corruption (CVE-2026-53281)
      * kernel: blk-mq: pop cached request if it is usable (CVE-2026-64017)


    Bug Fix(es) and Enhancement(s):

      * general protection fault during exportfs / nfsd4_revoke_states [almalinux-9.8.z]     (JIRA:AlmaLinux-188257)
      * Enable Pretimeout Watchdog Panic Functionality on x86 [almalinux-9.8.z] (JIRA:AlmaLinux-193729)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-47040 advisory.

    - blk-mq: reinsert cached request to the list (CKI Backport Bot) [RHEL-213163] {CVE-2026-64017}
    - blk-mq: pop cached request if it is usable (CKI Backport Bot) [RHEL-213163] {CVE-2026-64017}
    - futex: Drop CLONE_THREAD requirement for private default hash alloc (Audra Mitchell) [RHEL-193517]     {CVE-2026-52973}
    - xfrm: xfrm_alloc_spi shouldn't use 0 as SPI (Sabrina Dubroca) [RHEL-180033] {CVE-2025-39797}
    - xfrm: Duplicate SPI Handling (Sabrina Dubroca) [RHEL-180033] {CVE-2025-39797}
    - iommu/vt-d: Avoid NULL pointer dereference or refcount corruption (Eder Zulian) [RHEL-190342]     {CVE-2026-53281}
    - lib/buildid: use __kernel_read() for sleepable context (CKI Backport Bot) [RHEL-189962] {CVE-2026-23002}

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.

The remote AlmaLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:45114 advisory.

    * kernel: fs/notify: call exportfs_encode_fid with s_umount (CVE-2025-40237)
      * kernel: scsi: core: Wake up the error handler when final completions race against each other     (CVE-2026-23110)
      * kernel: rtnetlink: add missing netlink_ns_capable() check for peer netns (CVE-2026-31692)
      * kernel: net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels (CVE-2026-46099)
      * kernel: futex: Drop CLONE_THREAD requirement for private default hash alloc (CVE-2026-52973)
      * kernel: dm log: fix out-of-bounds write due to region_count overflow (CVE-2026-53059)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:47040 advisory.

    * kernel: xfrm: Duplicate SPI Handling (CVE-2025-39797)

    * kernel: lib/buildid: use __kernel_read() for sleepable context (CVE-2026-23002)

    * kernel: futex: Drop CLONE_THREAD requirement for private default hash alloc (CVE-2026-52973)

    * kernel: iommu/vt-d: Avoid NULL pointer dereference or refcount corruption (CVE-2026-53281)

    * kernel: blk-mq: pop cached request if it is usable (CVE-2026-64017)

    Bug Fix(es) and Enhancement(s):

    * general protection fault during exportfs / nfsd4_revoke_states [rhel-9.8.z] (JIRA:Rocky Linux-188257)

    * Enable Pretimeout Watchdog Panic Functionality on x86 [rhel-9.8.z] (JIRA:Rocky Linux-193729)

Tenable has extracted the preceding description block directly from the RockyLinux 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 Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-45114 advisory.

    - futex: Drop CLONE_THREAD requirement for private default hash alloc (Audra Mitchell) [RHEL-193518]     {CVE-2026-52973}
    - net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels (Antoine Tenart) [RHEL-179299] {CVE-2026-46099}
    - scsi: core: Wake up the error handler when final completions race against each other (CKI Backport Bot)     [RHEL-189651] {CVE-2026-23110}
    - dm log: fix out-of-bounds write due to region_count overflow (CKI Backport Bot) [RHEL-188547]     {CVE-2026-53059}
    - rtnetlink: add missing netlink_ns_capable() check for peer netns (Guillaume Nault) [RHEL-172537]     {CVE-2026-31692}
    - rtnetlink: Try the outer netns attribute in rtnl_get_peer_net(). (Guillaume Nault) [RHEL-172537]     {CVE-2026-31692}
    - rtnetlink: fix double call of rtnl_link_get_net_ifla() (Guillaume Nault) [RHEL-172537] {CVE-2026-31692}
    - netkit: Set IFLA_NETKIT_PEER_INFO to netkit_link_ops.peer_type. (Guillaume Nault) [RHEL-172537]     {CVE-2026-31692}
    - vxcan: Set VXCAN_INFO_PEER to vxcan_link_ops.peer_type. (Guillaume Nault) [RHEL-172537] {CVE-2026-31692}
    - veth: Set VETH_INFO_PEER to veth_link_ops.peer_type. (Guillaume Nault) [RHEL-172537] {CVE-2026-31692}
    - rtnetlink: Add peer_type in struct rtnl_link_ops. (Guillaume Nault) [RHEL-172537] {CVE-2026-31692}
    - fs/notify: call exportfs_encode_fid with s_umount (Jay Shin) [RHEL-169188] {CVE-2025-40237}

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.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:47040 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux operating system.

    Security Fix(es):

    * kernel: xfrm: Duplicate SPI Handling (CVE-2025-39797)

    * kernel: lib/buildid: use __kernel_read() for sleepable context (CVE-2026-23002)

    * kernel: futex: Drop CLONE_THREAD requirement for private default hash alloc (CVE-2026-52973)

    * kernel: iommu/vt-d: Avoid NULL pointer dereference or refcount corruption (CVE-2026-53281)

    * kernel: blk-mq: pop cached request if it is usable (CVE-2026-64017)

    Bug Fix(es) and Enhancement(s):

    * general protection fault during exportfs / nfsd4_revoke_states [rhel-9.8.z] (JIRA:RHEL-188257)

    * Enable Pretimeout Watchdog Panic Functionality on x86 [rhel-9.8.z] (JIRA:RHEL-193729)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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.

The remote RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:45114 advisory.

    * kernel: fs/notify: call exportfs_encode_fid with s_umount (CVE-2025-40237)
    * kernel: scsi: core: Wake up the error handler when final completions race against each other     (CVE-2026-23110)
    * kernel: rtnetlink: add missing netlink_ns_capable() check for peer netns (CVE-2026-31692)
    * kernel: net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels (CVE-2026-46099)
    * kernel: futex: Drop CLONE_THREAD requirement for private default hash alloc (CVE-2026-52973)
    * kernel: dm log: fix out-of-bounds write due to region_count overflow (CVE-2026-53059)

Tenable has extracted the preceding description block directly from the RockyLinux 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 Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:45114 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux operating system.

    Security Fix(es):

    * kernel: fs/notify: call exportfs_encode_fid with s_umount (CVE-2025-40237)
    * kernel: scsi: core: Wake up the error handler when final completions race against each other     (CVE-2026-23110)
    * kernel: rtnetlink: add missing netlink_ns_capable() check for peer netns (CVE-2026-31692)
    * kernel: net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels (CVE-2026-46099)
    * kernel: futex: Drop CLONE_THREAD requirement for private default hash alloc (CVE-2026-52973)
    * kernel: dm log: fix out-of-bounds write due to region_count overflow (CVE-2026-53059)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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.

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

  - futex: Drop CLONE_THREAD requirement for private default hash alloc Currently     need_futex_hash_allocate_default() depends on strict pthread semantics, abusing CLONE_THREAD. This breaks     the non-concurrency assumptions when doing the mm->futex_ref pcpu allocations, leading to bugs[0] when     sharing the mm in other ways; ie: BUG: KASAN: slab-use-after-free in futex_hash_put ... where the +1 bias     can end up on a percpu counter that mm->futex_ref no longer points at. Loosen the check to cover any     CLONE_VM clone, except vfork(). Excluding vfork keeps the existing paths untouched (no overhead), and we     can't race in the first place: either the parent is suspended and the child runs alone, or mm->futex_ref     is already allocated from an earlier CLONE_VM. (CVE-2026-52973)

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

ID	Name	Product	Family	Severity
331609	AlmaLinux 9 : kernel (ALSA-2026:47040)	Nessus	Alma Linux Local Security Checks	high
331544	Oracle Linux 9 : kernel (ELSA-2026-47040)	Nessus	Oracle Linux Local Security Checks	high
331378	AlmaLinux 10 : kernel (ALSA-2026:45114)	Nessus	Alma Linux Local Security Checks	high
331314	RockyLinux 9 : kernel (RLSA-2026:47040)	Nessus	Rocky Linux Local Security Checks	high
331297	Oracle Linux 10 : kernel (ELSA-2026-45114)	Nessus	Oracle Linux Local Security Checks	high
330427	RHEL 9 : kernel (RHSA-2026:47040)	Nessus	Red Hat Local Security Checks	high
330139	RockyLinux 10 : kernel (RLSA-2026:45114)	Nessus	Rocky Linux Local Security Checks	high
329341	RHEL 10 : kernel (RHSA-2026:45114)	Nessus	Red Hat Local Security Checks	high
323393	Linux Distros Unpatched Vulnerability : CVE-2026-52973	Nessus	Misc.	high
322020	Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1866)	Nessus	Amazon Linux Local Security Checks	high

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CVE-2026-52973

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