October 29, 2026

CVE Watchtower

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CVE-2025-39964NVD

Vulnerability Summary

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 Level
HIGH(7.8)
Published Date
Oct 13, 2025
Last Modified
Oct 19, 2026
Exploitation Status
ACTIVE
EPSS Score (30-Day)
1.57%Probability
Root Weakness (CWE)
CWE-362: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v3.1 Base Metrics — Score 7.8 (HIGH)
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Linux Linux Kernel >= 2.6.38 and < 5.10.245
  • Linux Linux Kernel >= 5.11 and < 5.15.194
  • Linux Linux Kernel >= 5.16 and < 6.1.154
  • Linux Linux Kernel >= 6.2 and < 6.6.108
  • Linux Linux Kernel >= 6.7 and < 6.12.49
  • Linux Linux Kernel >= 6.13 and < 6.16.9
  • Linux Linux Kernel
  • Siemens Simatic S7-1500 Cpu 1518-4 Pn\/dp Mfp Firmware >= 3.1.6
  • Siemens Simatic S7-1500 Cpu 1518f-4 Pn\/dp Mfp Firmware >= 3.1.6
Patched Versions
  • Linux Linux Kernel 5.10.245
  • Linux Linux Kernel 5.15.194
  • Linux Linux Kernel 6.1.154
  • Linux Linux Kernel 6.6.108
  • Linux Linux Kernel 6.12.49
  • Linux Linux Kernel 6.16.9
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🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
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External References