Improper Cleanup on Thrown Exception Affecting torvalds/linux package, versions [5.7,6.1.191)[6.2,6.6.160)[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-20698614
- published10 Oct 2026
- disclosed12 Feb 2025
- creditUnknown
Introduced: 12 Feb 2025
CVE-2025-21696 (opens in a new tab)How to fix?
Upgrade torvalds/linux to version 6.1.191, 6.6.160, 6.12.11 or higher.
Overview
Affected versions of this package are vulnerable to Improper Cleanup on Thrown Exception in the mremap process when handling memory regions previously registered with userfaultfd as write-protected but without the UFFD_FEATURE_EVENT_REMAP feature. An attacker can cause a mismatch between virtual memory area flags and page table entry flags by remapping such regions, potentially leading to warnings or undefined behavior when changing memory protections.
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