CVE-2026-89643

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-89643

Key Details

CVE	CVE-2026-89643
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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] (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89643
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89643

Source

Reference

NVD

CVE