CVE-2026-46033 (GCVE-0-2026-46033)
Vulnerability from cvelistv5
Published
2026-05-27 12:56
Modified
2026-08-21 12:12
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: f15f05b0a5de667c821a9727c33bce9d1d9b26dd
Version: f15f05b0a5de667c821a9727c33bce9d1d9b26dd
Version: f15f05b0a5de667c821a9727c33bce9d1d9b26dd
Version: f15f05b0a5de667c821a9727c33bce9d1d9b26dd
Version: f15f05b0a5de667c821a9727c33bce9d1d9b26dd
Version: f15f05b0a5de667c821a9727c33bce9d1d9b26dd
Version: f15f05b0a5de667c821a9727c33bce9d1d9b26dd
Version: f15f05b0a5de667c821a9727c33bce9d1d9b26dd
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: authencesn - reject short ahash digests during instance creation\n\nauthencesn requires either a zero authsize or an authsize of at least\n4 bytes because the ESN encrypt/decrypt paths always move 4 bytes of\nhigh-order sequence number data at the end of the authenticated data.\n\nWhile crypto_authenc_esn_setauthsize() already rejects explicit\nnon-zero authsizes in the range 1..3, crypto_authenc_esn_create()\nstill copied auth-\u003edigestsize into inst-\u003ealg.maxauthsize without\nvalidating it.  The AEAD core then initialized the tfm\u0027s default\nauthsize from that value.\n\nAs a result, selecting an ahash with digest size 1..3, such as\ncbcmac(cipher_null), exposed authencesn instances whose default\nauthsize was invalid even though setauthsize() would have rejected the\nsame value.  AF_ALG could then trigger the ESN tail handling with a\ntoo-short tag and hit an out-of-bounds access.\n\nReject authencesn instances whose ahash digest size is in the invalid\nnon-zero range 1..3 so that no tfm can inherit an unsupported default\nauthsize."
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