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crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

Type: advisorySource: Official CVE ListKnown exploited1 source record

In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencies in the internal socket state. Disallow this by adding a new ctx->write field that indiciates exclusive ownership for writing.

Announced Source revision 1
Original source ↗

CVE-2025-39964

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-2025-39964

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": "8ff590903d5fc7f5a0a988c38267a3d08e6393a2",
        "lessThan": "0f28c4adbc4a97437874c9b669fd7958a8c6d6ce",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8ff590903d5fc7f5a0a988c38267a3d08e6393a2",
        "lessThan": "e4c1ec11132ec466f7362a95f36a506ce4dc08c9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8ff590903d5fc7f5a0a988c38267a3d08e6393a2",
        "lessThan": "1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8ff590903d5fc7f5a0a988c38267a3d08e6393a2",
        "lessThan": "7c4491b5644e3a3708f3dbd7591be0a570135b84",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8ff590903d5fc7f5a0a988c38267a3d08e6393a2",
        "lessThan": "9aee87da5572b3a14075f501752e209801160d3d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8ff590903d5fc7f5a0a988c38267a3d08e6393a2",
        "lessThan": "45bcf60fe49b37daab1acee57b27211ad1574042",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8ff590903d5fc7f5a0a988c38267a3d08e6393a2",
        "lessThan": "1b34cbbf4f011a121ef7b2d7d6e6920a036d5285",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "crypto/af_alg.c",
      "include/crypto/if_alg.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.38"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.38",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.245",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.194",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.154",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.108",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.49",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.16.9",
        "versionType": "semver",
        "lessThanOrEqual": "6.16.*"
      },
      {
        "status": "unaffected",
        "version": "6.17",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "crypto/af_alg.c",
      "include/crypto/if_alg.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-39964

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2025-39964 · Unrated

Kernel · Known exploited (CISA KEV)

Event
#27077 · Revision 1
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Publisher date
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