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CVE-2025-39964

MEDIUMCVSS 3.1 · 5.5 · NIST NVD

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

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.

CISA KEV: known exploited

Added: 2026-09-18 · Due: 2026-09-21

Known ransomware use: Unknown

EPSS: 1.57% · Percentile: 75.2%

As of 2026-10-27

EPSS estimates exploitation probability over the next 30 days. KEV due dates apply to US federal civilian agencies. Confirm your affected versions in vendor advisories.

CWE: CWE-362 · Published: 2025-10-13T14:15:34.737 · Modified: 2026-10-19T21:10:00.160

Sources: NIST NVD, CISA KEV, FIRST EPSS. NVD and EPSS cached up to 6 hours; KEV up to 12 hours.

All CVSS assessments
  • CVSS 3.1: 5.5 (MEDIUM) · NIST NVD
    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  • CVSS 3.1: 7.8 (HIGH) · 416baaa9-dc9f-4396-8d5f-8c081fb06d67
    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References and fixes