dm-crypt: reject the lmk IV mode with AEAD ciphers

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99037
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 13:17:26 UTC
Updated2026-10-23 13:17:26 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dm-crypt: reject the lmk IV mode with AEAD ciphers A "capi:" table line that pairs an AEAD cipher with the lmk IV mode, for example "capi:gcm(aes)-lmk" with the integrity:28:aead option, causes an oops when it is loaded. lmk sets tfms_count to 64, but crypt_alloc_tfms_aead only allocates one transform, so crypt_setkey reads past the end of the tfms_aead array and calls crypto_aead_setkey on the values it finds there. lmk exists for compatibility with Loop-AES, which uses CBC, so refuse it with an AEAD cipher rather than allocate 64 AEAD transforms. The check cannot go in crypt_iv_lmk_ctr with the other lmk checks, because the IV constructor runs after crypt_set_key. Note that this is not a security bug because the memory corruption can only be triggered by root.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 33d2f09fcb357fd1861c4959d1d3505492bf91f8 9a0dab8a9d9975dec14a118b55cae2517aea5ca9 git Not specified
CNA Linux Linux affected 33d2f09fcb357fd1861c4959d1d3505492bf91f8 962ce265fbf5d87afeb78cf19c12e083ab0ffeb8 git Not specified
CNA Linux Linux affected 33d2f09fcb357fd1861c4959d1d3505492bf91f8 a1a875614dae43b43d311bb9e7a7a70eed78efe6 git Not specified
CNA Linux Linux affected 33d2f09fcb357fd1861c4959d1d3505492bf91f8 40ea7dfa8cd5f9aed72a55c9ca3008aee5880e6f git Not specified
CNA Linux Linux affected 33d2f09fcb357fd1861c4959d1d3505492bf91f8 3195e0daf590683992edb4eed32269e569e04924 git Not specified
CNA Linux Linux affected 4.12 Not specified
CNA Linux Linux unaffected 4.12 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.57 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.11 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/962ce265fbf5d87afeb78cf19c12e083ab0ffeb8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3195e0daf590683992edb4eed32269e569e04924 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a1a875614dae43b43d311bb9e7a7a70eed78efe6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/40ea7dfa8cd5f9aed72a55c9ca3008aee5880e6f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9a0dab8a9d9975dec14a118b55cae2517aea5ca9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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