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crypto: authencesn - reject short ahash digests during instance creation

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-46033

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-46033

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "f15f05b0a5de667c821a9727c33bce9d1d9b26dd",
        "lessThan": "77f59fb2d3aa33e90ec6cbbf45dcfb20ab82b1a9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f15f05b0a5de667c821a9727c33bce9d1d9b26dd",
        "lessThan": "2f31cd1e64a079c845bca31d2da7b3c90a311726",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f15f05b0a5de667c821a9727c33bce9d1d9b26dd",
        "lessThan": "d4c6a6d08e70bb1083c7c405fc7faacbf19aebc0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f15f05b0a5de667c821a9727c33bce9d1d9b26dd",
        "lessThan": "b69933e97efea238ebbfcf70c2b1be1cd03f13e3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f15f05b0a5de667c821a9727c33bce9d1d9b26dd",
        "lessThan": "67f1f0933cc3d78dde222842bcad2778ec7a0b88",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f15f05b0a5de667c821a9727c33bce9d1d9b26dd",
        "lessThan": "b42821c15445f93daea3e76ada682b2b7181c476",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f15f05b0a5de667c821a9727c33bce9d1d9b26dd",
        "lessThan": "9aff81e8217e9de2929084b03b3c7f81988c112b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f15f05b0a5de667c821a9727c33bce9d1d9b26dd",
        "lessThan": "5db6ef9847717329f12c5ea8aba7e9f588a980c0",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "crypto/authencesn.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.140",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.86",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.27",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "crypto/authencesn.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46033

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28376 · Revision 1
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