Vulnerability Analysis
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
Temporal Score:-
EPSS:0.32%
Threat Intelligence Signals
CISA KEV
YES
KEV Date Added
2026-09-18
Ransomware Use
Unknown
KEV Due Date
2026-09-21
VulnCheck In-the-Wild
No
Nuclei Template
No
EPSS Score
0.323%
EPSS Percentile
25.6th pct
GHSA ID
GitHub Severity
LOW
SSVC Exploitation
Active
SSVC Automatable
No
Vulnerability Class
—
Identity & Timeline
| Status | - |
| Assigning Authority | - |
| Discovered Via | - |
| Record Completeness | - |
| CVSS Version / Source | - |
| Reserved | - |
| Published | - |
| Patch Date (date_public) | - |
| Exploit DB Date | - |
| First GitHub PoC Date | - |
| Last Updated | - |
| Time to Patch (Days to fix) | - |
| Exploit Release Gap | - |
| PoC Release Gap | - |
| Exploit DB References | None identified |
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| No affected products specified. | ||
Social Buzz