Double Free Affecting torvalds/linux package, versions [5.14.19,5.15)[5.15.3,5.16)[5.16,6.1.191)[6.2,6.6.74)[6.7,6.12.11)
Threat Intelligence
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-20698606
- published10 Oct 2026
- disclosed31 Jan 2025
- creditUnknown
Introduced: 31 Jan 2025
CVE-2025-21673 (opens in a new tab)How to fix?
Upgrade torvalds/linux to version 5.15, 5.16, 6.1.191, 6.6.74, 6.12.11 or higher.
Overview
Affected versions of this package are vulnerable to Double Free in the cifs_put_tcp_session process. An attacker can cause kernel memory corruption, information disclosure, and potential privilege escalation by forcing repeated reconnects and manipulating DFS referral targets over the network, leading to a double free of the hostname field. This can result in arbitrary kernel memory exposure to userspace and system instability or crash.
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