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CVE-2025-39931 (GCVE-0-2025-39931)

Vulnerability from cvelistv5 – Published: 2025-10-04 07:30 – Updated: 2026-09-08 08:42
VLAI
Title
crypto: af_alg - Set merge to zero early in af_alg_sendmsg
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Set merge to zero early in af_alg_sendmsg If an error causes af_alg_sendmsg to abort, ctx->merge may contain a garbage value from the previous loop. This may then trigger a crash on the next entry into af_alg_sendmsg when it attempts to do a merge that can't be done. Fix this by setting ctx->merge to zero near the start of the loop.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 28f6f37abca7c5c9eb3959c66310f1d4d98b8aaf (git)
Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < db2b42425dfbde4983b0c20fb7cfa05f70e6a745 (git)
Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 6241b9e2809b12da9130894cf5beddf088dc1b8a (git)
Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 2374c11189ef704a3e4863646369f1b8e6a27d71 (git)
Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 24c1106504c625fabd3b7229611af617b4c27ac7 (git)
Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 045ee26aa3920a47ec46d7fcb302420bf01fd753 (git)
Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 9574b2330dbd2b5459b74d3b5e9619d39299fc6f (git)
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Linux Linux Affected: 2.6.38
Unaffected: 0 , < 2.6.38 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.154 , ≤ 6.1.* (semver)
Unaffected: 6.6.108 , ≤ 6.6.* (semver)
Unaffected: 6.12.49 , ≤ 6.12.* (semver)
Unaffected: 6.16.9 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:53:41+00:00",
      "cve": "CVE-2025-39931",
      "id": "CVE-2025-39931",
      "initial_release_date": "2025-10-04T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: crypto: af_alg - Set merge to zero early in af_alg_sendmsg",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39931.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.