Use After Free Affecting torvalds/linux package, versions [6.1,6.1.191)[6.2,6.6.117)[6.7,6.12.58)[6.13,6.17.8)
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-20700919
- published10 Oct 2026
- disclosed9 Dec 2025
- creditUnknown
Introduced: 9 Dec 2025
CVE-2025-40328 (opens in a new tab)How to fix?
Upgrade torvalds/linux to version 6.1.191, 6.6.117, 6.12.58, 6.17.8 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free in the smb2_close_cached_fid process. An attacker can cause kernel memory disclosure, arbitrary kernel memory writes, and potential control-flow hijack by racing the reference count decrement and lock acquisition, leading to use of freed objects. This can be triggered remotely by a malicious SMB server when a victim mounts and accesses an attacker-controlled SMB share.
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