CVE-2026-47331: Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list

Routine

HIGH 7.8WATCHLISTMITIGATE

CVE-2026-47331 is a high-severity flaw (CVSS 7.8) affecting ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An unprivileged local user could trigger the race condition that can lead to a use-after-free (UAF) and, theoretically, arbitrary code execution.

Why this priority

High severity
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-05-28
Last modified	2026-10-26

Publisher (CNA): Canonical Ltd. · Vendor: canonical

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-28 19:16 UTCPublished CVE record published
2026-10-26 13:10 UTCUpdated Record last modified

canonical ubuntu linux MITIGATE

Affected: 24.04 · 25.10 · 26.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 24.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47331?

ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-47331 being exploited?

CVE-2026-47331 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47331 affect?

CVE-2026-47331 affects ubuntu linux. Severity is high (CVSS 7.8). Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An unprivileged local user could trigger the race condition that can lead to a use-after-free (UAF) and, theoretically, arbitrary co

How urgent is CVE-2026-47331?

Priority 33/100. High severity; On your watchlist

Software pages

Ubuntu vulnerabilities

Related CVEs

CVE-2026-47333 HIGH 7.8 MITIGATE Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si
CVE-2026-47328 MEDIUM 6.1 MITIGATE Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly attempt to free a pointer whic
CVE-2026-47332 MEDIUM 5.5 MITIGATE Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern
CVE-2026-47326 MEDIUM 5.5 MITIGATE Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a memory leak in the handling of big responses to Ap
CVE-2026-47334 MEDIUM 5.5 MITIGATE Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock

References

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