In the Linux kernel, the following vulnerability has been resolved: md: fix array_state=clear sysfs deadlock When "clear" is written to array_state, md_attr_store() breaks sysfs active protection so the array can delete itself from its own sysfs store method. However, md_attr_store() currently drops the mddev reference before calling sysfs_unbreak_active_protection(). Once do_md_stop(..., 0) has made the mddev eligible for delayed deletion, the temporary kobject reference taken by sysfs_break_active_protection() can become the last kobject reference protecting the md kobject. That allows sysfs_unbreak_active_protection() to drop the last kobject reference from the current sysfs writer context. kobject teardown then recurses into kernfs removal while the current sysfs node is still being unwound, and lockdep reports recursive locking on kn->active with kernfs_drain() in the call chain. Reproducer on an existing level: 1. Create an md0 linear array and activate it: mknod /dev/md0 b 9 0 echo none > /sys/block/md0/md/metadata_version echo linear > /sys/block/md0/md/level echo 1 > /sys/block/md0/md/raid_disks echo "$(cat /sys/class/block/sdb/dev)" > /sys/block/md0/md/new_dev echo "$(($(cat /sys/class/block/sdb/size) / 2))" > \ /sys/block/md0/md/dev-sdb/size echo 0 > /sys/block/md0/md/dev-sdb/slot echo active > /sys/block/md0/md/array_state 2. Wait briefly for the array to settle, then clear it: sleep 2 echo clear > /sys/block/md0/md/array_state The warning looks like: WARNING: possible recursive locking detected bash/588 is trying to acquire lock: (kn->active#65) at __kernfs_remove+0x157/0x1d0 but task is already holding lock: (kn->active#65) at sysfs_unbreak_active_protection+0x1f/0x40 ... Call Trace: kernfs_drain __kernfs_remove kernfs_remove_by_name_ns sysfs_remove_group sysfs_remove_groups __kobject_del kobject_put md_attr_store kernfs_fop_write_iter vfs_write ksys_write Restore active protection before mddev_put() so the extra sysfs kobject reference is dropped while the mddev is still held alive. The actual md kobject deletion is then deferred until after the sysfs write path has fully returned.

The remote Oracle Linux 10 / 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-500150 advisory.

    - x86/bugs: Make Safe-RET robust against interrupt injection (Borislav Petkov (AMD))  [Orabug: 39844812]     {CVE-2026-68480}
    - KVM: x86: Check for invalid/obsolete root *after* making MMU pages available (Sean Christopherson)     [Orabug: 39844799]  {CVE-2026-64561}
    - net: openvswitch: reject oversized nested action attrs (Asim Viladi Oglu Manizada)  [Orabug: 39816011]     {CVE-2026-64531}
    - xfrm: hold dev ref until after transport_finish NF_HOOK (Qi Tang)  [Orabug: 39262397]  {CVE-2026-31663}
    - KVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry (Hyunwoo Kim)     [Orabug: 39531622]  {CVE-2026-46316}
    - ipv6: account for fraggap on the paged allocation path (Wongi Lee)  [Orabug: 39686467]  {CVE-2026-53362}
    - KVM: x86: Fix shadow paging use-after-free due to unexpected role (Paolo Bonzini) [Orabug:
    39673856,39686459] {CVE-2026-53359}
    - net/sched: fix pedit partial COW leading to page cache corruption (Rajat Gupta) [Orabug:
    39567285,39668752] {CVE-2026-46331}
    - net_sched: act_pedit: use RCU in tcf_pedit_dump() (Eric Dumazet) [Orabug: 39567285] {CVE-2026-46331}
    - eventpoll: fix ep_remove struct eventpoll / struct file UAF (Christian Brauner) [Orabug: 39466882]     {CVE-2026-46242}
    - eventpoll: move epi_fget() up (Christian Brauner) [Orabug: 39466882] {CVE-2026-46242}
    - eventpoll: rename ep_remove_safe() back to ep_remove() (Christian Brauner) [Orabug: 39466882]     {CVE-2026-46242}
    - eventpoll: drop vestigial __ prefix from ep_remove_{file,epi}() (Christian Brauner) [Orabug: 39466882]     {CVE-2026-46242}
    - eventpoll: kill __ep_remove() (Christian Brauner) [Orabug: 39466882] {CVE-2026-46242}
    - eventpoll: split __ep_remove() (Christian Brauner) [Orabug: 39466882] {CVE-2026-46242}
    - eventpoll: use hlist_is_singular_node() in __ep_remove() (Christian Brauner) [Orabug: 39466882]     {CVE-2026-46242}
    - md: fix array_state=clear sysfs deadlock (Yu Kuai) [Orabug: 39190489,39668924] {CVE-2026-53125}
    - md: avoid repeated calls to del_gendisk (Xiao Ni) [Orabug: 39190489,39668918] {CVE-2025-68373}
    - net: skbuff: fix missing zerocopy reference in pskb_carve helpers (Minh Nguyen) [Orabug:
    39619387,39639984,39656679] {CVE-2026-52943}
    - net/mlx5: Fix crash when moving to switchdev mode (Patrisious Haddad) [Orabug: 38667152,39344020]     {CVE-2026-43467}
    - net/mlx5: Fix double unregister of HCA_PORTS component (Gerd Bayer) [Orabug: 38667152,39590860]     {CVE-2025-68790}
    - net/mlx5: Fix IPsec cleanup over MPV device (Patrisious Haddad) [Orabug: 38667152,38730559]     {CVE-2025-40238}
    - net/mlx5: HWS, fix complex rules rehash error flow (Yevgeny Kliteynik) [Orabug: 38667152,39590850]     {CVE-2025-39768}
    - macsec: sync features on RTM_NEWLINK (Stanislav Fomichev) [Orabug: 38667152,39590858] {CVE-2025-39874}
    - net: dev_ioctl: take ops lock in hwtstamp lower paths (Carolina Jubran) [Orabug: 38667152,39590854]     {CVE-2025-39908}
    - team: replace team lock with rtnl lock (Stanislav Fomichev) [Orabug: 38667152,39590857] {CVE-2025-39733}
    - net: prevent a NULL deref in rtnl_create_link() (Eric Dumazet) [Orabug: 38667152,39590851]     {CVE-2025-38271}
    - virtio-pci: Fix result size returned for the admin command completion (Israel Rukshin) [Orabug:
    38667152,39590859] {CVE-2025-38314}

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.

  - md: fix array_state=clear sysfs deadlock When clear is written to array_state, md_attr_store() breaks     sysfs active protection so the array can delete itself from its own sysfs store method. However,     md_attr_store() currently drops the mddev reference before calling sysfs_unbreak_active_protection(). Once     do_md_stop(..., 0) has made the mddev eligible for delayed deletion, the temporary kobject reference taken     by sysfs_break_active_protection() can become the last kobject reference protecting the md kobject. That     allows sysfs_unbreak_active_protection() to drop the last kobject reference from the current sysfs writer     context. kobject teardown then recurses into kernfs removal while the current sysfs node is still being     unwound, and lockdep reports recursive locking on kn->active with kernfs_drain() in the call chain.
    Reproducer on an existing level: 1. Create an md0 linear array and activate it: mknod /dev/md0 b 9 0 echo     none > /sys/block/md0/md/metadata_version echo linear > /sys/block/md0/md/level echo 1 >     /sys/block/md0/md/raid_disks echo $(cat /sys/class/block/sdb/dev) > /sys/block/md0/md/new_dev echo     $(($(cat /sys/class/block/sdb/size) / 2)) > \ /sys/block/md0/md/dev-sdb/size echo 0 >     /sys/block/md0/md/dev-sdb/slot echo active > /sys/block/md0/md/array_state 2. Wait briefly for the array     to settle, then clear it: sleep 2 echo clear > /sys/block/md0/md/array_state The warning looks like:
    WARNING: possible recursive locking detected bash/588 is trying to acquire lock: (kn->active#65) at
    __kernfs_remove+0x157/0x1d0 but task is already holding lock: (kn->active#65) at     sysfs_unbreak_active_protection+0x1f/0x40 ... Call Trace: kernfs_drain __kernfs_remove     kernfs_remove_by_name_ns sysfs_remove_group sysfs_remove_groups __kobject_del kobject_put md_attr_store     kernfs_fop_write_iter vfs_write ksys_write Restore active protection before mddev_put() so the extra sysfs     kobject reference is dropped while the mddev is still held alive. The actual md kobject deletion is then     deferred until after the sysfs write path has fully returned. (CVE-2026-53125)

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

ID	Name	Product	Family	Type	Severity
340681	Ubuntu 24.04 LTS / 26.04 LTS / Pro Realtime 24.04 LTS : Linux kernel (NVIDIA) vulnerabilities (USN-8663-1)	Nessus	Ubuntu Local Security Checks	Local	high
340045	Ubuntu 26.04 LTS : Linux kernel (NVIDIA BaseOS) vulnerabilities (USN-8664-1)	Nessus	Ubuntu Local Security Checks	Local	high
334160	Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-500150)	Nessus	Oracle Linux Local Security Checks	Local	medium
322701	Linux Distros Unpatched Vulnerability : CVE-2026-53125	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

Detections

Analytics

CVE-2026-53125

medium

Tenable Plugins

high

high

medium

medium

high