Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') Affecting torvalds/linux package, versions [2.6.38,5.10.245)[5.11,5.15.194)[5.16,6.1.154)[6.2,6.6.108)[6.7,6.12.49)[6.13,6.16.9)
Threat Intelligence
Snyk has reported that there have been attempts or successful attacks targeting this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-TORVALDSLINUX-20700609
- published10 Oct 2026
- disclosed13 Oct 2025
- creditUnknown
Introduced: 13 Oct 2025
CVE-2025-39964 (opens in a new tab)How to fix?
Upgrade torvalds/linux to version 5.10.245, 5.15.194, 6.1.154, 6.6.108, 6.12.49, 6.16.9 or higher.
Overview
Affected versions of this package are vulnerable to Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') through concurrent access to the af_alg_sendmsg process. An attacker can achieve arbitrary kernel memory disclosure, controlled kernel memory writes, privilege escalation, and system crashes by issuing multiple simultaneous writes to the same AF_ALG socket, causing unpredictable data interleaving and inconsistencies in internal socket state.
Note: The Linux kernel project assigns a CVE to every bug fix it ships, whether or not the bug has been shown to be exploitable. This advisory was generated from that process and has not been individually assessed for exploitability. See the kernel's CVE process documentation: https://github.com/torvalds/linux/blob/master/Documentation/process/cve.rst