crash_dump: release keyring reference at the correct time

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93106
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:04 UTC
Updated2026-09-17 17:18:04 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: crash_dump: release keyring reference at the correct time restore_dm_crypt_keys_to_thread_keyring() gets a reference to the user keyring before restoring the saved dm-crypt keys. The same keyring reference is then passed to add_key_to_keyring() for each saved key, but add_key_to_keyring() drops that reference on every call. This is only balanced when exactly one key is restored. With multiple keys, the keyring reference is dropped too many times and may trigger a refcount underflow or use-after-free. When more than five keys are restored, a refcount underflow/use-after-free warning can be triggered. The early error paths after lookup_user_key() also return without dropping the keyring reference. Keep ownership of the keyring reference in restore_dm_crypt_keys_to_thread_keyring(), drop it once on all exit paths, and make add_key_to_keyring() only use the reference without consuming it.

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.098600000 (date 2026-09-18)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 62f17d9df6924cf805de5ae970470615c1c8d9f2 b0f7343a002f9c8b8378011f60482c76f3216dfd git Not specified
CNA Linux Linux affected 62f17d9df6924cf805de5ae970470615c1c8d9f2 ed566979f99c5516cad45a76ae25e2a4928ffb67 git Not specified
CNA Linux Linux affected 62f17d9df6924cf805de5ae970470615c1c8d9f2 ada2e5a44e99113e08ad9b7b71396c6c572204da git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ada2e5a44e99113e08ad9b7b71396c6c572204da 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ed566979f99c5516cad45a76ae25e2a4928ffb67 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b0f7343a002f9c8b8378011f60482c76f3216dfd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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