In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Avoid NULL pointer dereference or refcount corruption Commit 60f030f7418d ("iommu/vt-d: Avoid use of NULL after WARN_ON_ONCE") fixed a NULL pointer dereference in an unlikely situation partly. If dev_pasid is not found in the dev_pasids list, it remains NULL. However, the teardown operations are executed unconditionally, this lead to a NULL pointer dereference or refcount corruption. If the domain was never attached to this IOMMU, info will be NULL, which would cause an immediate dereference when checking --info->refcnt. Even if info is not NULL, decrementing the refcount without having removed a valid PASID might unbalance the count. This could lead to premature dropping of the refcount to 0, potentially causing a use-after-free for the remaining active devices sharing the domain. Fix it by returning early if dev_pasid is NULL, before executing the teardown operations. Issue found by AI review and suggested by Kevin Tian. https://sashiko.dev/#/patchset/20260421031347.1408890-1-zhenzhong.duan%40intel.com

The remote AlmaLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:47017 advisory.

    * kernel: net: bridge: use a stable FDB dst snapshot in RCU readers (CVE-2026-46086)
      * kernel: ipv6: fix possible UAF in icmpv6_rcv() (CVE-2026-53006)
      * kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)
      * kernel: iommu/vt-d: Avoid NULL pointer dereference or refcount corruption (CVE-2026-53281)


    Bug Fix(es) and Enhancement(s):

      * rxrpc: Address CVE-2026-43500 [almalinux-10.2.z] (JIRA:AlmaLinux-178254)

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 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 Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-47017 advisory.

    - ipv6: fix possible UAF in icmpv6_rcv() (CKI Backport Bot) [RHEL-192215] {CVE-2026-53006}
    - tipc: fix double-free in tipc_buf_append() (CKI Backport Bot) [RHEL-192181] {CVE-2026-52993}
    - iommu/vt-d: Avoid NULL pointer dereference or refcount corruption (Eder Zulian) [RHEL-190344]     {CVE-2026-53281}
    - net: bridge: use a stable FDB dst snapshot in RCU readers (Mohammad Heib) [RHEL-179338] {CVE-2026-46086}
    - rxrpc: fix oversized RESPONSE authenticator length check (Marc Dionne) [RHEL-178254] {CVE-2026-31635}
    - rxrpc: Fix integer overflow in rxgk_verify_response() (Marc Dionne) [RHEL-178254] {CVE-2026-31633}
    - rxrpc: Fix leak of rxgk context in rxgk_verify_response() (Marc Dionne) [RHEL-178254] {CVE-2026-31632}
    - rxrpc: Fix buffer overread in rxgk_do_verify_authenticator() (Marc Dionne) [RHEL-178254]     {CVE-2026-31631}
    - rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present (Marc Dionne) [RHEL-178254]     {CVE-2026-43500}

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 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 RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:47017 advisory.

    * kernel: net: bridge: use a stable FDB dst snapshot in RCU readers (CVE-2026-46086)

    * kernel: ipv6: fix possible UAF in icmpv6_rcv() (CVE-2026-53006)

    * kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)

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

    Bug Fix(es) and Enhancement(s):

    * rxrpc: Address CVE-2026-43500 [rhel-10.2.z] (JIRA:Rocky Linux-178254)

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 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 Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:47017 advisory.

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

    Security Fix(es):

    * kernel: net: bridge: use a stable FDB dst snapshot in RCU readers (CVE-2026-46086)

    * kernel: ipv6: fix possible UAF in icmpv6_rcv() (CVE-2026-53006)

    * kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)

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

    Bug Fix(es) and Enhancement(s):

    * rxrpc: Address CVE-2026-43500 [rhel-10.2.z] (JIRA:RHEL-178254)

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

  - iommu/vt-d: Avoid NULL pointer dereference or refcount corruption Commit 60f030f7418d (iommu/vt-d: Avoid     use of NULL after WARN_ON_ONCE) fixed a NULL pointer dereference in an unlikely situation partly. If     dev_pasid is not found in the dev_pasids list, it remains NULL. However, the teardown operations are     executed unconditionally, this lead to a NULL pointer dereference or refcount corruption. If the domain     was never attached to this IOMMU, info will be NULL, which would cause an immediate dereference when     checking --info->refcnt. Even if info is not NULL, decrementing the refcount without having removed a     valid PASID might unbalance the count. This could lead to premature dropping of the refcount to 0,     potentially causing a use-after-free for the remaining active devices sharing the domain. Fix it by     returning early if dev_pasid is NULL, before executing the teardown operations. Issue found by AI review     and suggested by Kevin Tian.
    https://sashiko.dev/#/patchset/20260421031347.1408890-1-zhenzhong.duan%40intel.com (CVE-2026-53281)

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

ID	Name	Product	Family	Type	Severity
331658	AlmaLinux 10 : kernel (ALSA-2026:47017)	Nessus	Alma Linux Local Security Checks	Local	medium
331609	AlmaLinux 9 : kernel (ALSA-2026:47040)	Nessus	Alma Linux Local Security Checks	Local	high
331544	Oracle Linux 9 : kernel (ELSA-2026-47040)	Nessus	Oracle Linux Local Security Checks	Local	high
331542	Oracle Linux 10 : kernel (ELSA-2026-47017)	Nessus	Oracle Linux Local Security Checks	Local	medium
331314	RockyLinux 9 : kernel (RLSA-2026:47040)	Nessus	Rocky Linux Local Security Checks	Local	high
330696	RockyLinux 10 : kernel (RLSA-2026:47017)	Nessus	Rocky Linux Local Security Checks	Local	medium
330427	RHEL 9 : kernel (RHSA-2026:47040)	Nessus	Red Hat Local Security Checks	Local	high
330349	RHEL 10 : kernel (RHSA-2026:47017)	Nessus	Red Hat Local Security Checks	Local	medium
329305	openSUSE 16: cluster-md-kmp-64kb / cluster-md-kmp-azure / cluster-md-kmp-default / etc (openSUSE-SU-2026:21388-1)	Nessus	SuSE Local Security Checks	Local	high
326000	SUSE SLED15: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:2800-1)	Nessus	SuSE Local Security Checks	Local	high
323508	Linux Distros Unpatched Vulnerability : CVE-2026-53281	Nessus	Misc.	Local	medium
322020	Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1866)	Nessus	Amazon Linux Local Security Checks	Local	high

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CVE-2026-53281

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