CVE-2026-47326 PUBLISHED

Memory leak in Ubuntu Linux AppArmor large notification response allocation

Assigner: canonical
Reserved: 19.05.2026 Published: 28.05.2026 Updated: 28.05.2026

Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a memory leak in the handling of big responses to AppArmor notifications. The bug can be triggered by an unprivileged local user. The memory leak could lead to resource exhaustion.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 5.5

Attack Vector	Local	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Canonical
Product	Ubuntu Linux
Versions	Default: unaffected affected from 6.8.0 to 6.8.0-124.124 (excl.) affected from 6.17.0 to 6.17.0-35.35 (excl.) affected from 7.0.0 to 7.0.0-22.22 (excl.)

Credits

Tristan Madani (@TristanInSec), Talence Security finder

References

https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/commit/?id=8d858ecb7e2e216ca2987302a04c266f2355fefe

Problem Types

CWE-401 Missing release of memory after effective lifetime CWE