In the Linux kernel, the following vulnerability has been resolved: perf/aux: Fix page UAF in map_range() map_range() reads rb->aux_pages[], rb->aux_nr_pages and rb->aux_pgoff via perf_mmap_to_page() while holding only event->mmap_mutex. Those fields are serialized by rb->aux_mutex, and mmap_mutex is per event. Thus, two events sharing one rb via PERF_EVENT_IOC_SET_OUTPUT can race rb_alloc_aux() with map_range(), leading to a page-UAF scenario as follows: CPU 0 CPU 1 ===== ===== rb_alloc_aux() map_range() [1]: allocate rb->aux_pages[0] [2]: rb->aux_nr_pages++ [3]: perf_mmap_to_page() returns rb->aux_pages[0] [4]: map it as VM_PFNMAP [5]: rb->aux_pgoff = 1 munmap the page [6]: free rb->aux_pages[0] Pages mapped as VM_PFNMAP have no refcount protection, so CPU 1 holds a mapping to a freed physical frame. Fix this by taking rb->aux_mutex across the page walk in map_range().

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-54343 advisory.

    - scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (Maurizio Lombardi)     [RHEL-213198] {CVE-2026-63887}
    - perf/aux: Fix page UAF in map_range() (CKI Backport Bot) [RHEL-218475] {CVE-2026-64300}
    - net/sched: act_api: use RCU with deferred freeing for action lifecycle (CKI Backport Bot) [RHEL-218188]     {CVE-2026-53264}
    - KVM: x86/mmu: Ensure hugepage is in by slot before checking max mapping level (Aidan Wallace)     [RHEL-213472] {CVE-2026-63807}
    - accel/ivpu: Fix signed integer truncation in IPC receive (CKI Backport Bot) [RHEL-190054]     {CVE-2026-53202}
    - netfilter: nf_tables: use list_del_rcu for netlink hooks (Florian Westphal) [RHEL-185311]     {CVE-2026-46324}
    - netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO (Florian Westphal) [RHEL-185311]     {CVE-2026-45841}
    - nfnetlink_osf: validate individual option lengths in fingerprints (Florian Westphal) [RHEL-185311]     {CVE-2026-23397}
    - netfilter: nft_ct: fix use-after-free in timeout object destroy (Florian Westphal) [RHEL-185311]     {CVE-2026-31665}
    - netfilter: xt_multiport: validate range encoding in checkentry (Florian Westphal) [RHEL-185311]     {CVE-2026-31681}
    - netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator (Florian Westphal) [RHEL-185311]     {CVE-2026-43085}
    - netfilter: nf_tables: reject immediate NF_QUEUE verdict (Florian Westphal) [RHEL-185311]     {CVE-2026-43024}
    - netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP (Florian     Westphal) [RHEL-185311] {CVE-2026-31424}
    - netfilter: ctnetlink: ignore explicit helper on new expectations (Florian Westphal) [RHEL-185311]     {CVE-2026-43025}
    - netfilter: ctnetlink: zero expect NAT fields when CTA_EXPECT_NAT absent (Florian Westphal) [RHEL-185311]     {CVE-2026-43026}
    - netfilter: x_tables: ensure names are nul-terminated (Florian Westphal) [RHEL-185311] {CVE-2026-43028}
    - netfilter: nfnetlink_log: account for netlink header size (Florian Westphal) [RHEL-185311]     {CVE-2026-31416}
    - netfilter: ctnetlink: use netlink policy range checks (Florian Westphal) [RHEL-185311] {CVE-2026-31495}
    - netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() (Florian Westphal) [RHEL-185311]     {CVE-2026-31674}
    - netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD (Florian Westphal)     [RHEL-185311] {CVE-2026-31428}
    - netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry (Florian Westphal)     [RHEL-185311] {CVE-2026-43114}
    - nf_tables: nft_dynset: fix possible stateful expression memleak in error path (Florian Westphal)     [RHEL-185311] {CVE-2026-23399}
    - netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case (Florian Westphal) [RHEL-185311]     {CVE-2026-23456}
    - netfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp() (Florian Westphal)     [RHEL-185311] {CVE-2026-23457}
    - netfilter: conntrack: add missing netlink policy validations (Florian Westphal) [RHEL-185311]     {CVE-2026-31407}
    - netfilter: ctnetlink: fix use-after-free in ctnetlink_dump_exp_ct() (Florian Westphal) [RHEL-185311]     {CVE-2026-23458}
    - netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path (Florian Westphal) [RHEL-185311]     {CVE-2026-43451}
    - netfilter: nft_set_pipapo: fix stack out-of-bounds read in pipapo_drop() (Florian Westphal)     [RHEL-185311] {CVE-2026-43453}
    - netfilter: nf_tables: unconditionally bump set->nelems before insertion (Florian Westphal) [RHEL-185311]     {CVE-2026-23272}
    - netfilter: nf_conntrack_h323: fix OOB read in decode_choice() (Florian Westphal) [RHEL-185311]     {CVE-2026-43233}
    - netfilter: nf_tables: always walk all pending catchall elements (Florian Westphal) [RHEL-185311]     {CVE-2026-23278}

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-2026:54343 advisory.

    * kernel: accel/ivpu: Fix signed integer truncation in IPC receive (CVE-2026-53202)
      * kernel: net/sched: act_api: use RCU with deferred freeing for action lifecycle (CVE-2026-53264)
      * kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-63887)
      * kernel: perf/aux: Fix page UAF in map_range() (CVE-2026-64300)
      * kernel: af_unix: set gc_in_progress to true in unix_gc() (CVE-2026-53361)


    Bug Fix(es) and Enhancement(s):

      * netfilter: CVE backports for AlmaLinux 10.2.z (JIRA:AlmaLinux-185311)
      * tlbflush - Windows Driver Verifier catches FLTMGR/Ntfs crashes during KVM 42-VM soak test on AMD EPYC     Turin [almalinux-10.2.z] (JIRA:AlmaLinux-214436)

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-2026:54343 advisory.

    * kernel: accel/ivpu: Fix signed integer truncation in IPC receive (CVE-2026-53202)

    * kernel: net/sched: act_api: use RCU with deferred freeing for action lifecycle (CVE-2026-53264)

    * kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-63887)

    * kernel: perf/aux: Fix page UAF in map_range() (CVE-2026-64300)

    Bug Fix(es) and Enhancement(s):

    * netfilter: CVE backports for Rocky Linux 10.2.z (JIRA:Rocky Linux-185311)

    * tlbflush - Windows Driver Verifier catches FLTMGR/Ntfs crashes during KVM 42-VM soak test on AMD EPYC     Turin [rhel-10.2.z] (JIRA:Rocky Linux-214436)

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-2026:54343 advisory.

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

    Security Fix(es):

    * kernel: accel/ivpu: Fix signed integer truncation in IPC receive (CVE-2026-53202)

    * kernel: net/sched: act_api: use RCU with deferred freeing for action lifecycle (CVE-2026-53264)

    * kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-63887)

    * kernel: perf/aux: Fix page UAF in map_range() (CVE-2026-64300)

    Bug Fix(es) and Enhancement(s):

    * netfilter: CVE backports for RHEL 10.2.z (JIRA:RHEL-185311)

    * tlbflush - Windows Driver Verifier catches FLTMGR/Ntfs crashes during KVM 42-VM soak test on AMD EPYC     Turin [rhel-10.2.z] (JIRA:RHEL-214436)

    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.

  - perf/aux: Fix page UAF in map_range() map_range() reads rb->aux_pages[], rb->aux_nr_pages and     rb->aux_pgoff via perf_mmap_to_page() while holding only event->mmap_mutex. Those fields are serialized by     rb->aux_mutex, and mmap_mutex is per event. Thus, two events sharing one rb via PERF_EVENT_IOC_SET_OUTPUT     can race rb_alloc_aux() with map_range(), leading to a page-UAF scenario as follows: CPU 0 CPU 1 =====     ===== rb_alloc_aux() map_range() [1]: allocate rb->aux_pages[0] [2]: rb->aux_nr_pages++ [3]:
    perf_mmap_to_page() returns rb->aux_pages[0] [4]: map it as VM_PFNMAP [5]: rb->aux_pgoff = 1 munmap the     page [6]: free rb->aux_pages[0] Pages mapped as VM_PFNMAP have no refcount protection, so CPU 1 holds a     mapping to a freed physical frame. Fix this by taking rb->aux_mutex across the page walk in map_range().
    (CVE-2026-64300)

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

ID	Name	Product	Family	Type	Severity
335462	Oracle Linux 10 : kernel (ELSA-2026-54343)	Nessus	Oracle Linux Local Security Checks	Local	critical
335441	AlmaLinux 10 : kernel (ALSA-2026:54343)	Nessus	Alma Linux Local Security Checks	Local	critical
335186	RockyLinux 10 : kernel (RLSA-2026:54343)	Nessus	Rocky Linux Local Security Checks	Local	critical
334954	RHEL 10 : kernel (RHSA-2026:54343)	Nessus	Red Hat Local Security Checks	Local	critical
329840	Linux Distros Unpatched Vulnerability : CVE-2026-64300	Nessus	Misc.	Local	high

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