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CVE-2025-39964

crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

CVSS 3.1 High 7.8Known exploited (CISA KEV)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Description

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.

Official description from the CVE record, published by Linux. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 3.1 High 7.8
Score published by Linux in the CVE record.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local

    The attacker needs local access to the system, or to trick a user into running something.

  • Attack complexity: Low

    No special conditions are needed. The attack can be repeated at will.

  • Privileges required: Low

    A basic user account is needed.

  • User interaction: None

    No action from any user is needed.

  • Scope: Unchanged

    The impact stays within the vulnerable component.

  • Confidentiality impact: High

    Serious or total effect on the secrecy of data.

  • Integrity impact: High

    Serious or total effect on the trustworthiness of data.

  • Availability impact: High

    Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS
Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.01607 (1.6% probability)
Percentile
76.1%
Scores of
Nov 10, 2026
Model
v2026.06.15
CISA Known Exploited Vulnerabilities
This CVE is listed in the CISA KEV catalog.
Name in the catalog
Linux Kernel Race Condition Vulnerability
Added to the catalog
Sep 18, 2026
Federal due date
Sep 21, 2026
CISA assessment as of Sep 18, 2026
Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
no
Technical impact
total
Weakness (CWE)
CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.
  • CWE-362Concurrent Execution using Shared Resource with Improper Synchronization
Affected products
Products listed in the CVE record, as the CNA published them.

  • Linux

    • affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 up to before 0f28c4adbc4a97437874c9b669fd7958a8c6d6ce
    • affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 up to before e4c1ec11132ec466f7362a95f36a506ce4dc08c9
    • affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 up to before 1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8
    • affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 up to before 7c4491b5644e3a3708f3dbd7591be0a570135b84
    • affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 up to before 9aee87da5572b3a14075f501752e209801160d3d
    • affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 up to before 45bcf60fe49b37daab1acee57b27211ad1574042
    • affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 up to before 1b34cbbf4f011a121ef7b2d7d6e6920a036d5285

  • Linux

    • affected: 2.6.38
    • unaffected: before 2.6.38
    • unaffected: 5.10.245 up to 5.10.*
    • unaffected: 5.15.194 up to 5.15.*
    • unaffected: 6.1.154 up to 6.1.*
    • unaffected: 6.6.108 up to 6.6.*
    • unaffected: 6.12.49 up to 6.12.*
    • unaffected: 6.16.9 up to 6.16.*
    • unaffected: 6.17 up to *
References
Links listed in the CVE record. They lead to other sites, which CubePath does not control.
Timeline
  1. ID reserved
  2. Record published
  3. Added to CISA KEV
  4. Record last updated

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:06 UTC. Sources and licenses