Vulnerability Intelligence Report
crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg
CVE-2025-39964
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
SSVC: Active Exploitation
CVSS Base Score
7.8
HIGH
Exploitability:1.9
Impact Score:5.9
EPSS Probability:0.32%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
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Weaknesses (CWE)
CWE-362 ↗CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Linux | Linux | 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 0f28c4adbc4a97437874c9b669fd7958a8c6d6ce (affected), 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < e4c1ec11132ec466f7362a95f36a506ce4dc08c9 (affected), 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 (affected), 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 7c4491b5644e3a3708f3dbd7591be0a570135b84 (affected), 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 9aee87da5572b3a14075f501752e209801160d3d (affected), 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 45bcf60fe49b37daab1acee57b27211ad1574042 (affected), 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 (affected) |
| Linux | Linux | 2.6.38 (affected), 0 < 2.6.38 (unaffected), 5.10.245 <= 5.10.* (unaffected), 5.15.194 <= 5.15.* (unaffected), 6.1.154 <= 6.1.* (unaffected), 6.6.108 <= 6.6.* (unaffected), 6.12.49 <= 6.12.* (unaffected), 6.16.9 <= 6.16.* (unaffected), 6.17 <= * (unaffected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | kernel.org · Vendor · USA |
| Reserved | 2025-04-16T07:20:57 |
| Published | 2025-10-13T13:48:30 |
| Last Updated | 2026-09-19T03:56:17 |
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