Unknown

CVE-2026-98862 — audit: fix exe mark UAF in kill_rules()

In the Linux kernel, the following vulnerability has been resolved: audit: fix exe mark UAF in kill_rules() kill_rules() removes mixed AUDIT_DIR and AUDIT_EXE rules when an audit tree is pruned. It drops entry->rule.exe before removing the rule from the RCU-visible filter lists. After a rule has been installed with AUDIT_ADD_RULE, which requires CAP_AUDIT_CONTROL, removing the watched directory can race with another task that is still evaluating the rule. In that case, fsnotify can free the executable mark before the reader reaches audit_mark_compare(), causing a use-after-free. KASAN reports: BUG: KASAN: slab-use-after-free in audit_mark_compare+0x8d/0xa0 Unlink the published rules from the RCU-visible lists and retain them on tree->rules for cleanup. If any rule has an executable mark, wait for a single RCU grace period before removing the marks and scheduling the entries for freeing. Otherwise, call_rcu() already provides the required deferred freeing without a synchronous wait.

Published Oct 18, 2026 · Updated Oct 18, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

No scoring signals.

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and < 304960900991157e6883bdf0b39782b690545ee8≥ 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and < 88633025f20ba9c32ccdb3efc86eafdf98cb825c≥ 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and < f2cc5462b78559c7628a9f8ac9a9592e7783183a≥ 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and < aa650d87a498844060eecb1d336f4d46f4d1b0b3version 4.3	Vulnerable	CVE Program (cve.org) e CISA ADP

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 18, 2026
Affected products added · linux/linux
Oct 18, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 18, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 18, 2026 · NIST National Vulnerability Database
CVE published
Oct 18, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 18, 2026 – Oct 18, 2026

References

4 on the record

git.kernel.org/stable/c/304960900991157e6883bdf0b39782b690545ee8
NIST National Vulnerability Database
git.kernel.org/stable/c/88633025f20ba9c32ccdb3efc86eafdf98cb825c
NIST National Vulnerability Database
git.kernel.org/stable/c/aa650d87a498844060eecb1d336f4d46f4d1b0b3
NIST National Vulnerability Database
git.kernel.org/stable/c/f2cc5462b78559c7628a9f8ac9a9592e7783183a
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 17h
Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 17h
Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 17h
Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 17h
Unknown CVE-2026-98857 ipvs: bound LBLCR and LBLC cache growth 17h
Unknown CVE-2026-98858 io_uring: fix task_work add use-after-free with SQPOLL 17h

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-98862 is "audit: fix exe mark UAF in kill_rules()", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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