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CVE-2025-39964

HIGH · CVSS 7.8 · Analyzed

Published: 2025-10-13 · Updated: 2026-10-19 · Source: NVD

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Vulnerability overview

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.

Severity and scoring

CVSS score
7.8 · HIGH
CVSS version
3.1
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-362

CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.

Known exploitation and remediation

Listed in CISA’s Known Exploited Vulnerabilities catalog.

Affected product
Linux · Kernel
Added to catalog
2026-09-18
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA remediation due date
2026-09-21

CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.

Verify affected versions and patch availability in the vendor advisory before making changes.

Affected products and versions

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 2.6.38

    Before (exclusive): 5.10.245

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 5.11

    Before (exclusive): 5.15.194

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 5.16

    Before (exclusive): 6.1.154

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 6.2

    Before (exclusive): 6.6.108

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 6.7

    Before (exclusive): 6.12.49

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 6.13

    Before (exclusive): 6.16.9

  • cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*

  • cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*

  • cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*

  • cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*

  • cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*

  • cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*

  • cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware:*:*:*:*:*:*:*:*

    From (inclusive): 3.1.6

  • cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518f-4_pn\/dp_mfp_firmware:*:*:*:*:*:*:*:*

    From (inclusive): 3.1.6

These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.

Advisories and references

Explore official sources

Read the official NVD record ↗

Explore the CISA catalog ↗

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