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CVE-2026-89643— audit: avoid dropping live tree ref on fsnotify rule autoremove

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于审计规则自动删除时错误释放活动树引用，可能导致释放后重用，进而引发空指针取消引用或系统崩溃。

CVSS 9.8 · Critical EPSS 0.70% · P52

Possible ATT&CK Techniques 1 AI

T1210.001

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 34d99af52ad40bd498ba66970579a5bc1fb1a3bc< 9cac21f8eb82675ed19fb955b8bbb9dd14cc3d58 affected
34d99af52ad40bd498ba66970579a5bc1fb1a3bc< b322cc7adcd2e6ec1594d187533a126506ab545c affected
34d99af52ad40bd498ba66970579a5bc1fb1a3bc< 695c85dc345a4e0292739f004c261bedef3f27e6 affected
34d99af52ad40bd498ba66970579a5bc1fb1a3bc< 01b0ec8c397be65ff710777c97017ca1de56ef8e affected
34d99af52ad40bd498ba66970579a5bc1fb1a3bc< cf37b61b5420fd4600fe78cf8c24da6e4d9bfe28 affected
34d99af52ad40bd498ba66970579a5bc1fb1a3bc< 636a99bab36ba27515363d325866c0273ac83b3e affected
34d99af52ad40bd498ba66970579a5bc1fb1a3bc< 583cf579b32d99e3fe4e9c8ecc4d852e3708fbec affected
34d99af52ad40bd498ba66970579a5bc1fb1a3bc< 783f0f0974c156aca630f4ffff248671082a098d affected
… +10 more rows
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I. Basic Information for CVE-2026-89643

Vulnerability Information
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Vulnerability Title
audit: avoid dropping live tree ref on fsnotify rule autoremove
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: audit: avoid dropping live tree ref on fsnotify rule autoremove audit_del_rule() is used for both netlink deletion templates and internal fsnotify autoremove. The former passes a parsed template which owns a temporary tree reference; the latter passes the installed entry itself. The unconditional audit_put_tree() at the end of audit_del_rule() assumes the template case. For mixed AUDIT_DIR plus AUDIT_EXE rules, an fsnotify autoremove event therefore drops the installed rule's live tree reference. Repeating this across rules sharing the same tree can free the tree while another rule still references it, and a later autoremove dereferences the freed pathname while comparing rules. Move the temporary-tree put to audit_rule_change(), the caller that owns deletion templates. Keep it in the AUDIT_DEL_RULE cleanup so both successful deletion and -ENOENT still release the parser-owned tree. [PM: dropped unnecessary comment for line length reasons]
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于审计规则自动删除时错误释放活动树引用，可能导致释放后重用，进而引发空指针取消引用或系统崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 34d99af52ad40bd498ba66970579a5bc1fb1a3bc ~ 9cac21f8eb82675ed19fb955b8bbb9dd14cc3d58 -
Linux Linux 4.3 -

II. Public POCs for CVE-2026-89643

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III. Intelligence Information for CVE-2026-89643

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Patches & Fixes for CVE-2026-89643 (8)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89688 9.8 CRITICAL nfsd: drop the stateid, not the stateowner, on seqid_op replay retry
CVE-2026-89655 9.8 CRITICAL ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock
CVE-2026-89658 9.8 CRITICAL NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup
CVE-2026-89660 9.8 CRITICAL NFSD: Prevent client use-after-free during admin state revocation
CVE-2026-89659 9.8 CRITICAL NFSD: Prevent client use-after-free during delegation revoke
CVE-2026-89662 9.8 CRITICAL NFSD: Prevent lock owner use-after-free during client teardown
CVE-2026-89669 9.8 CRITICAL nfsd: initialize copy-notify stateid before publishing it
CVE-2026-89674 9.8 CRITICAL nfsd: fix XDR length calculation in nfsd4_ff_encode_layoutget
CVE-2026-89675 9.8 CRITICAL nfsd: fix UAF in async copy cancel and shutdown
CVE-2026-89676 9.8 CRITICAL nfsd: fix stale s2s_cp_stateids IDR entry for async COPY
CVE-2026-89677 9.8 CRITICAL nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file()
CVE-2026-89681 9.8 CRITICAL nfsd: fix layout fence worker double-reference race
CVE-2026-89686 9.8 CRITICAL nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke
CVE-2026-89703 9.8 CRITICAL nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations
CVE-2026-89479 9.8 CRITICAL sctp: stop processing a packet once its association is deleted
CVE-2026-89478 9.8 CRITICAL sctp: drop a chunk if its transport was removed
CVE-2026-89702 9.8 CRITICAL nfsd: size fh_verify server sockaddr slot by xpt_locallen
CVE-2026-89482 9.8 CRITICAL nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89708 9.8 CRITICAL nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown
CVE-2026-89712 9.8 CRITICAL NFSD: restart ssc_expire_umount walk after dropping nfsd_ssc_lock

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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