FKIE_CVE-2026-46033

Vulnerability from fkie_nvd - Published: 2026-05-27 14:17 - Updated: 2026-05-27 14:48
Severity
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5db6ef9847717329f12c5ea8aba7e9f588a980c0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/67f1f0933cc3d78dde222842bcad2778ec7a0b88
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9aff81e8217e9de2929084b03b3c7f81988c112b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b42821c15445f93daea3e76ada682b2b7181c476
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b69933e97efea238ebbfcf70c2b1be1cd03f13e3
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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."
    }
  ],
  "id": "CVE-2026-46033",
  "lastModified": "2026-05-27T14:48:03.013",
  "metrics": {},
  "published": "2026-05-27T14:17:22.313",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5db6ef9847717329f12c5ea8aba7e9f588a980c0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/67f1f0933cc3d78dde222842bcad2778ec7a0b88"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9aff81e8217e9de2929084b03b3c7f81988c112b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b42821c15445f93daea3e76ada682b2b7181c476"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b69933e97efea238ebbfcf70c2b1be1cd03f13e3"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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