In the Linux kernel, the following vulnerability has been resolved: slab: Avoid race on slab->obj_exts in alloc_slab_obj_exts If two competing threads enter alloc_slab_obj_exts() and one of them fails to allocate the object extension vector, it might override the valid slab->obj_exts allocated by the other thread with OBJEXTS_ALLOC_FAIL. This will cause the thread that lost this race and expects a valid pointer to dereference a NULL pointer later on. Update slab->obj_exts atomically using cmpxchg() to avoid slab->obj_exts overrides by racing threads. Thanks for Vlastimil and Suren's help with debugging.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1495 advisory.

    In the Linux kernel, the following vulnerability has been resolved:

    net/sched: sch_qfq: Fix null-deref in agg_dequeue (CVE-2025-40083)

    In the Linux kernel, the following vulnerability has been resolved:

    btrfs: fix memory leak of qgroup_list in btrfs_add_qgroup_relation (CVE-2025-40209)

    In the Linux kernel, the following vulnerability has been resolved:

    ACPI: video: Fix use-after-free in acpi_video_switch_brightness() (CVE-2025-40211)

    In the Linux kernel, the following vulnerability has been resolved:

    mm: prevent poison consumption when splitting THP (CVE-2025-40230)

    In the Linux kernel, the following vulnerability has been resolved:

    vsock: fix lock inversion in vsock_assign_transport() (CVE-2025-40231)

    In the Linux kernel, the following vulnerability has been resolved:

    btrfs: directly free partially initialized fs_info in btrfs_check_leaked_roots() (CVE-2025-40235)

    In the Linux kernel, the following vulnerability has been resolved:

    fs/notify: call exportfs_encode_fid with s_umount (CVE-2025-40237)

    In the Linux kernel, the following vulnerability has been resolved:

    net/mlx5: Fix IPsec cleanup over MPV device (CVE-2025-40238)

    In the Linux kernel, the following vulnerability has been resolved:

    sctp: avoid NULL dereference when chunk data buffer is missing (CVE-2025-40240)

    In the Linux kernel, the following vulnerability has been resolved:

    virtio-net: fix received length check in big packets (CVE-2025-40292)

    In the Linux kernel, the following vulnerability has been resolved:

    iommufd: Don't overflow during division for dirty tracking (CVE-2025-40293)

    In the Linux kernel, the following vulnerability has been resolved:

    net: bridge: fix use-after-free due to MST port state bypass (CVE-2025-40297)

    In the Linux kernel, the following vulnerability has been resolved:

    media: videobuf2: forbid remove_bufs when legacy fileio is active (CVE-2025-40302)

    In the Linux kernel, the following vulnerability has been resolved:

    btrfs: ensure no dirty metadata is written back for an fs with errors (CVE-2025-40303)

    In the Linux kernel, the following vulnerability has been resolved:

    fbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds (CVE-2025-40304)

    In the Linux kernel, the following vulnerability has been resolved:

    exfat: validate cluster allocation bits of the allocation bitmap (CVE-2025-40307)

    In the Linux kernel, the following vulnerability has been resolved:

    ntfs3: pretend $Extend records as regular files (CVE-2025-40313)

    In the Linux kernel, the following vulnerability has been resolved:

    regmap: slimbus: fix bus_context pointer in regmap init calls (CVE-2025-40317)

    In the Linux kernel, the following vulnerability has been resolved:

    bpf: Sync pending IRQ work before freeing ring buffer (CVE-2025-40319)

    In the Linux kernel, the following vulnerability has been resolved:

    smb: client: fix potential cfid UAF in smb2_query_info_compound (CVE-2025-40320)

    In the Linux kernel, the following vulnerability has been resolved:

    fbdev: bitblit: bound-check glyph index in bit_putcs* (CVE-2025-40322)

    In the Linux kernel, the following vulnerability has been resolved:

    fbcon: Set fb_display[i]->mode to NULL when the mode is released (CVE-2025-40323)

    In the Linux kernel, the following vulnerability has been resolved:

    NFSD: Fix crash in nfsd4_read_release() (CVE-2025-40324)

    In the Linux kernel, the following vulnerability has been resolved:

    smb: client: fix potential UAF in smb2_close_cached_fid() (CVE-2025-40328)

    In the Linux kernel, the following vulnerability has been resolved:

    drm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb (CVE-2025-40329)

    In the Linux kernel, the following vulnerability has been resolved:

    sctp: Prevent TOCTOU out-of-bounds write (CVE-2025-40331)

    In the Linux kernel, the following vulnerability has been resolved:

    futex: Don't leak robust_list pointer on exec race (CVE-2025-40341)

    In the Linux kernel, the following vulnerability has been resolved:

    arch_topology: Fix incorrect error check in topology_parse_cpu_capacity() (CVE-2025-40346)

    In the Linux kernel, the following vulnerability has been resolved:

    slab: Avoid race on slab->obj_exts in alloc_slab_obj_exts (CVE-2025-40348)

    In the Linux kernel, the following vulnerability has been resolved:

    net/mlx5e: RX, Fix generating skb from non-linear xdp_buff for striding RQ (CVE-2025-40350)

    In the Linux kernel, the following vulnerability has been resolved:

    arm64: mte: Do not warn if the page is already tagged in copy_highpage() (CVE-2025-40353)

    In the Linux kernel, the following vulnerability has been resolved:

    net/smc: fix general protection fault in __smc_diag_dump (CVE-2025-40357)

    In the Linux kernel, the following vulnerability has been resolved:

    perf/x86/intel: Fix KASAN global-out-of-bounds warning (CVE-2025-40359)

    In the Linux kernel, the following vulnerability has been resolved:

    drm/sysfb: Do not dereference NULL pointer in plane reset (CVE-2025-40360)

    In the Linux kernel, the following vulnerability has been resolved:

    ceph: fix multifs mds auth caps issue (CVE-2025-40362)

    In the Linux kernel, the following vulnerability has been resolved:

    net: ipv6: fix field-spanning memcpy warning in AH output (CVE-2025-40363)

    In the Linux kernel, the following vulnerability has been resolved:

    gpiolib: fix invalid pointer access in debugfs (CVE-2025-68167)

    In the Linux kernel, the following vulnerability has been resolved:

    x86/fpu: Ensure XFD state on signal delivery (CVE-2025-68171)

    In the Linux kernel, the following vulnerability has been resolved:

    ftrace: Fix softlockup in ftrace_module_enable (CVE-2025-68173)

    In the Linux kernel, the following vulnerability has been resolved:

    cpufreq/longhaul: handle NULL policy in longhaul_exit (CVE-2025-68177)

    In the Linux kernel, the following vulnerability has been resolved:

    blk-cgroup: fix possible deadlock while configuring policy (CVE-2025-68178)

    In the Linux kernel, the following vulnerability has been resolved:

    ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)

    In the Linux kernel, the following vulnerability has been resolved:

    nfs4_setup_readdir(): insufficient locking for ->d_parent->d_inode dereferencing (CVE-2025-68185)

    In the Linux kernel, the following vulnerability has been resolved:

    ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up (CVE-2025-68186)

    In the Linux kernel, the following vulnerability has been resolved:

    tcp: use dst_dev_rcu() in tcp_fastopen_active_disable_ofo_check() (CVE-2025-68188)

    In the Linux kernel, the following vulnerability has been resolved:

    udp_tunnel: use netdev_warn() instead of netdev_WARN() (CVE-2025-68191)

    In the Linux kernel, the following vulnerability has been resolved:

    tty: serial: ip22zilog: Use platform device for probing (CVE-2025-68311)

    In the Linux kernel, the following vulnerability has been resolved:

    x86/CPU/AMD: Add RDSEED fix for Zen5 (CVE-2025-68313)

    In the Linux kernel, the following vulnerability has been resolved:

    io_uring/zctx: check chained notif contexts (CVE-2025-68317)

    In the Linux kernel, the following vulnerability has been resolved:

    page_pool: always add GFP_NOWARN for ATOMIC allocations (CVE-2025-68321)

Tenable has extracted the preceding description block directly from the tested product 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 / 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-50006 advisory.

    - xfrm: delete x->tunnel as we delete x (Sabrina Dubroca)   {CVE-2025-40215}

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

  - slab: Avoid race on slab->obj_exts in alloc_slab_obj_exts If two competing threads enter     alloc_slab_obj_exts() and one of them fails to allocate the object extension vector, it might override the     valid slab->obj_exts allocated by the other thread with OBJEXTS_ALLOC_FAIL. This will cause the thread     that lost this race and expects a valid pointer to dereference a NULL pointer later on. Update     slab->obj_exts atomically using cmpxchg() to avoid slab->obj_exts overrides by racing threads. Thanks for     Vlastimil and Suren's help with debugging. (CVE-2025-40348)

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

ID	Name	Product	Family	Severity
304297	Amazon Linux 2023 : bpftool6.12, kernel6.12, kernel6.12-devel (ALAS2023-2026-1495)	Nessus	Amazon Linux Local Security Checks	high
284515	Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-50006)	Nessus	Oracle Linux Local Security Checks	high
278925	Linux Distros Unpatched Vulnerability : CVE-2025-40348	Nessus	Misc.	medium

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