In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix RxGK token loading to check bounds rxrpc_preparse_xdr_yfs_rxgk() reads the raw key length and ticket length from the XDR token as u32 values and passes each through round_up(x, 4) before using the rounded value for validation and allocation. When the raw length is >= 0xfffffffd, round_up() wraps to 0, so the bounds check and kzalloc both use 0 while the subsequent memcpy still copies the original ~4 GiB value, producing a heap buffer overflow reachable from an unprivileged add_key() call. Fix this by: (1) Rejecting raw key lengths above AFSTOKEN_GK_KEY_MAX and raw ticket lengths above AFSTOKEN_GK_TOKEN_MAX before rounding, consistent with the caps that the RxKAD path already enforces via AFSTOKEN_RK_TIX_MAX. (2) Sizing the flexible-array allocation from the validated raw key length via struct_size_t() instead of the rounded value. (3) Caching the raw lengths so that the later field assignments and memcpy calls do not re-read from the token, eliminating a class of TOCTOU re-parse. The control path (valid token with lengths within bounds) is unaffected.

The remote AlmaLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:27288 advisory.

    * kernel: can: isotp: fix tx.buf use-after-free in isotp_sendmsg() (CVE-2026-31474)
      * kernel: mptcp: fix slab-use-after-free in __inet_lookup_established (CVE-2026-31669)
      * kernel: rxrpc: Fix RxGK token loading to check bounds (CVE-2026-31641)
      * kernel: xen/privcmd: fix double free via VMA splitting (CVE-2026-31787)
      * kernel: Buffer overflow in drivers/xen/sys-hypervisor.c (CVE-2026-31786)
      * kernel: net: mana: fix use-after-free in add_adev() error path (CVE-2026-43056)
      * kernel: Bluetooth: hci_sync: fix stack buffer overflow in hci_le_big_create_sync (CVE-2026-31772)
      * kernel: bnxt_en: Fix RSS context delete logic (CVE-2026-43260)
      * kernel: crypto: caam - fix overflow on long hmac keys (CVE-2026-43330)
      * kernel: net/sched: act_pedit: extend the writable skb range per key (CVE-2026-46331)
      * kernel: Bluetooth: hci_event: fix potential UAF in SSP passkey handlers (CVE-2026-46056)
      * kernel: wifi: mac80211: drop stray 'static' from fast-RX rx_result (CVE-2026-46152)
      * kernel: wifi: mac80211: remove station if connection prep fails (CVE-2026-46125)
      * kernel: exit: prevent preemption of oopsing TASK_DEAD task (CVE-2026-46173)
      * kernel: wifi: mac80211: use safe list iteration in radar detect work (CVE-2026-46166)


    Bug Fix(es) and Enhancement(s):

      * AlmaLinux10.0 - s390/ap: Expose ap_bindings_complete_count counter via sysfs [almalinux-10.2.z]     (JIRA:AlmaLinux-166047)
      * AlmaLinux9.5 crash due to lpfc NULL ndlp->vport [almalinux-10.2.z] (JIRA:AlmaLinux-171774)
      * objtool static_call check blocks build of out-of-tree livepatch modules on AlmaLinux 10.2 GA kernels ?     missing upstream revert f495054bd12e (JIRA:AlmaLinux-178495)
      * ibmveth Adapter Freeze with Small MSS [almalinux-10.2.z] (JIRA:AlmaLinux-179723)
      * rbd: eliminate a race in lock_dwork draining on unmap [almalinux-10.2.z] (JIRA:AlmaLinux-183127)
      * AlmaLinux10.0 - s390/mm: Add missing secure storage access fixups [almalinux-10.2.z]     (JIRA:AlmaLinux-183319)
      * [AlmaLinux10.2.z] Enable Pretimeout Watchdog Panic Functionality on x86 (JIRA:AlmaLinux-182299)

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 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:27288 advisory.

    * kernel: can: isotp: fix tx.buf use-after-free in isotp_sendmsg() (CVE-2026-31474)

    * kernel: mptcp: fix slab-use-after-free in __inet_lookup_established (CVE-2026-31669)

    * kernel: rxrpc: Fix RxGK token loading to check bounds (CVE-2026-31641)

    * kernel: xen/privcmd: fix double free via VMA splitting (CVE-2026-31787)

    * kernel: Buffer overflow in drivers/xen/sys-hypervisor.c (CVE-2026-31786)

    * kernel: net: mana: fix use-after-free in add_adev() error path (CVE-2026-43056)

    * kernel: Bluetooth: hci_sync: fix stack buffer overflow in hci_le_big_create_sync (CVE-2026-31772)

    * kernel: bnxt_en: Fix RSS context delete logic (CVE-2026-43260)

    * kernel: crypto: caam - fix overflow on long hmac keys (CVE-2026-43330)

    * kernel: net/sched: act_pedit: extend the writable skb range per key (CVE-2026-46331)

    * kernel: Bluetooth: hci_event: fix potential UAF in SSP passkey handlers (CVE-2026-46056)

    * kernel: wifi: mac80211: drop stray 'static' from fast-RX rx_result (CVE-2026-46152)

    * kernel: wifi: mac80211: remove station if connection prep fails (CVE-2026-46125)

    * kernel: exit: prevent preemption of oopsing TASK_DEAD task (CVE-2026-46173)

    * kernel: wifi: mac80211: use safe list iteration in radar detect work (CVE-2026-46166)

    Bug Fix(es) and Enhancement(s):

    * Rocky Linux10.0 - s390/ap: Expose ap_bindings_complete_count counter via sysfs [rhel-10.2.z] (JIRA:Rocky     Linux-166047)

    * Rocky Linux9.5 crash due to lpfc NULL ndlp->vport [rhel-10.2.z] (JIRA:Rocky Linux-171774)

    * objtool static_call check blocks build of out-of-tree livepatch modules on Rocky Linux 10.2 GA kernels ?     missing upstream revert f495054bd12e (JIRA:Rocky Linux-178495)

    * ibmveth Adapter Freeze with Small MSS [rhel-10.2.z] (JIRA:Rocky Linux-179723)

    * rbd: eliminate a race in lock_dwork draining on unmap [rhel-10.2.z] (JIRA:Rocky Linux-183127)

    * Rocky Linux10.0 - s390/mm: Add missing secure storage access fixups [rhel-10.2.z] (JIRA:Rocky     Linux-183319)

    * [Rocky Linux10.2.z] Enable Pretimeout Watchdog Panic Functionality on x86 (JIRA:Rocky Linux-182299)

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-2026:27288 advisory.

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

    Security Fix(es):

    * kernel: can: isotp: fix tx.buf use-after-free in isotp_sendmsg() (CVE-2026-31474)

    * kernel: mptcp: fix slab-use-after-free in __inet_lookup_established (CVE-2026-31669)

    * kernel: rxrpc: Fix RxGK token loading to check bounds (CVE-2026-31641)

    * kernel: xen/privcmd: fix double free via VMA splitting (CVE-2026-31787)

    * kernel: Buffer overflow in drivers/xen/sys-hypervisor.c (CVE-2026-31786)

    * kernel: net: mana: fix use-after-free in add_adev() error path (CVE-2026-43056)

    * kernel: Bluetooth: hci_sync: fix stack buffer overflow in hci_le_big_create_sync (CVE-2026-31772)

    * kernel: bnxt_en: Fix RSS context delete logic (CVE-2026-43260)

    * kernel: crypto: caam - fix overflow on long hmac keys (CVE-2026-43330)

    * kernel: net/sched: act_pedit: extend the writable skb range per key (CVE-2026-46331)

    * kernel: Bluetooth: hci_event: fix potential UAF in SSP passkey handlers (CVE-2026-46056)

    * kernel: wifi: mac80211: drop stray 'static' from fast-RX rx_result (CVE-2026-46152)

    * kernel: wifi: mac80211: remove station if connection prep fails (CVE-2026-46125)

    * kernel: exit: prevent preemption of oopsing TASK_DEAD task (CVE-2026-46173)

    * kernel: wifi: mac80211: use safe list iteration in radar detect work (CVE-2026-46166)

    Bug Fix(es) and Enhancement(s):

    * RHEL10.0 - s390/ap: Expose ap_bindings_complete_count counter via sysfs [rhel-10.2.z] (JIRA:RHEL-166047)

    * RHEL9.5 crash due to lpfc NULL ndlp->vport [rhel-10.2.z] (JIRA:RHEL-171774)

    * objtool static_call check blocks build of out-of-tree livepatch modules on RHEL 10.2 GA kernels ?     missing upstream revert f495054bd12e (JIRA:RHEL-178495)

    * ibmveth Adapter Freeze with Small MSS [rhel-10.2.z] (JIRA:RHEL-179723)

    * rbd: eliminate a race in lock_dwork draining on unmap [rhel-10.2.z] (JIRA:RHEL-183127)

    * RHEL10.0 - s390/mm: Add missing secure storage access fixups [rhel-10.2.z] (JIRA:RHEL-183319)

    * [RHEL10.2.z] Enable Pretimeout Watchdog Panic Functionality on x86 (JIRA:RHEL-182299)

    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.

  - rxrpc: Fix RxGK token loading to check bounds rxrpc_preparse_xdr_yfs_rxgk() reads the raw key length and     ticket length from the XDR token as u32 values and passes each through round_up(x, 4) before using the     rounded value for validation and allocation. When the raw length is >= 0xfffffffd, round_up() wraps to 0,     so the bounds check and kzalloc both use 0 while the subsequent memcpy still copies the original ~4 GiB     value, producing a heap buffer overflow reachable from an unprivileged add_key() call. Fix this by: (1)     Rejecting raw key lengths above AFSTOKEN_GK_KEY_MAX and raw ticket lengths above AFSTOKEN_GK_TOKEN_MAX     before rounding, consistent with the caps that the RxKAD path already enforces via AFSTOKEN_RK_TIX_MAX.
    (2) Sizing the flexible-array allocation from the validated raw key length via struct_size_t() instead of     the rounded value. (3) Caching the raw lengths so that the later field assignments and memcpy calls do not     re-read from the token, eliminating a class of TOCTOU re-parse. The control path (valid token with lengths     within bounds) is unaffected. (CVE-2026-31641)

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

ID	Name	Product	Family	Severity
323100	AlmaLinux 10 : kernel (ALSA-2026:27288)	Nessus	Alma Linux Local Security Checks	high
321956	RockyLinux 10 : kernel (RLSA-2026:27288)	Nessus	Rocky Linux Local Security Checks	high
321829	RHEL 10 : kernel (RHSA-2026:27288)	Nessus	Red Hat Local Security Checks	high
310512	Linux Distros Unpatched Vulnerability : CVE-2026-31641	Nessus	Misc.	high

Detections

Analytics

CVE-2026-31641

high

Tenable Plugins

high

high

high

high