crypto: authencesn - reject short ahash digests during instance creation

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Summary

CVECVE-2026-46033
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:22 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: crypto: authencesn - reject short ahash digests during instance creation authencesn requires either a zero authsize or an authsize of at least 4 bytes because the ESN encrypt/decrypt paths always move 4 bytes of high-order sequence number data at the end of the authenticated data. While crypto_authenc_esn_setauthsize() already rejects explicit non-zero authsizes in the range 1..3, crypto_authenc_esn_create() still copied auth->digestsize into inst->alg.maxauthsize without validating it. The AEAD core then initialized the tfm's default authsize from that value. As a result, selecting an ahash with digest size 1..3, such as cbcmac(cipher_null), exposed authencesn instances whose default authsize was invalid even though setauthsize() would have rejected the same value. AF_ALG could then trigger the ESN tail handling with a too-short tag and hit an out-of-bounds access. Reject authencesn instances whose ahash digest size is in the invalid non-zero range 1..3 so that no tfm can inherit an unsupported default authsize.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd b69933e97efea238ebbfcf70c2b1be1cd03f13e3 git Not specified
CNA Linux Linux affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd 67f1f0933cc3d78dde222842bcad2778ec7a0b88 git Not specified
CNA Linux Linux affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd b42821c15445f93daea3e76ada682b2b7181c476 git Not specified
CNA Linux Linux affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd 9aff81e8217e9de2929084b03b3c7f81988c112b git Not specified
CNA Linux Linux affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd 5db6ef9847717329f12c5ea8aba7e9f588a980c0 git Not specified
CNA Linux Linux affected 4.11 Not specified
CNA Linux Linux unaffected 4.11 semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5db6ef9847717329f12c5ea8aba7e9f588a980c0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9aff81e8217e9de2929084b03b3c7f81988c112b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b69933e97efea238ebbfcf70c2b1be1cd03f13e3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b42821c15445f93daea3e76ada682b2b7181c476 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/67f1f0933cc3d78dde222842bcad2778ec7a0b88 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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