apparmor: fix: limit the number of levels of policy namespaces

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Summary

CVECVE-2026-23405
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-01 09:16:16 UTC
Updated2026-04-01 14:23:37 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: apparmor: fix: limit the number of levels of policy namespaces Currently the number of policy namespaces is not bounded relying on the user namespace limit. However policy namespaces aren't strictly tied to user namespaces and it is possible to create them and nest them arbitrarily deep which can be used to exhaust system resource. Hard cap policy namespaces to the same depth as user namespaces.

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.045290000 (date 2026-04-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c88d4c7b049e87998ac0a9f455aa545cc895ef92 3f8699b3ee0c04b4b9bc27b82cd89a40e81e1d2e git Not specified
CNA Linux Linux affected c88d4c7b049e87998ac0a9f455aa545cc895ef92 853ce31ca72097d23991a06876a2ccb5cb64b603 git Not specified
CNA Linux Linux affected c88d4c7b049e87998ac0a9f455aa545cc895ef92 d42b2b6bb77ca40ee34ab74ad79305840b5f315d git Not specified
CNA Linux Linux affected c88d4c7b049e87998ac0a9f455aa545cc895ef92 7b6495ead2c611647f6b11441a852324e3eb8616 git Not specified
CNA Linux Linux affected c88d4c7b049e87998ac0a9f455aa545cc895ef92 306039414932c80f8420695a24d4fe10c84ccfb2 git Not specified
CNA Linux Linux affected 2.6.36 Not specified
CNA Linux Linux unaffected 2.6.36 semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.77 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.18 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.8 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7b6495ead2c611647f6b11441a852324e3eb8616 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/853ce31ca72097d23991a06876a2ccb5cb64b603 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/306039414932c80f8420695a24d4fe10c84ccfb2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d42b2b6bb77ca40ee34ab74ad79305840b5f315d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3f8699b3ee0c04b4b9bc27b82cd89a40e81e1d2e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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