CVE•Published 2025-10-13•Modified 2026-10-15•1 article on news•5 live references•NVD data
CVE-2025-39964Linux · Linux_kernel
Vulnerability data via NVD (ingested)
CVSS v3.1
7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
69
Exploit Prediction Scoring System · top 31% of all CVEs
Weaknesses (CWE)
Description
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.
Timeline
Published 2025-10-13
Modified 2026-10-15
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2025-39964Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · OS
os:"Linux Kernel"Hosts Shodan identified as running Linux Kernel.
More intel sources (5)
Shodan report
vuln:CVE-2025-39964Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2025-39964Censys host search filtered to this CVE id.
grep.app
CVE-2025-39964Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2025-39964GitHub code search for direct mentions.
Google dork
"CVE-2025-39964" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub (7)
CVE-2025-399647 repos
Ostorlab/KEVunknown
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
opendr-io/causalityJupyter Notebook
The difference between exploitation prediction and detection is akin to the difference between detecting a missile launch or a detonation. Every avoided exploitation cycle saves hu…
liamromanis101/K8s-container_escape_auditShell
Look for possible escape vectors from a container
Rubby2001/CVE-POCSPython
n1k0oowang/CVE-2025-39964_EXPC
CVE-2025-39964 EXP
barmi/cve-patch-auditorGo
Audit CVE impact, patch status, remediation progress, and verification results across systems.
mc493/linux-kernel-zero-day-mitigation-zero-downtime-kernel-defense-Python
Zero-downtime Linux kernel zero-day defense case study. For the automated CLI and dual-witness notary framework, see mc493/kshield.