Use After Free Affecting torvalds/linux package, versions [5.18.18,5.19)[5.19,6.6.145)[6.7,6.12.96)[6.13,6.18.39)[6.19,7.1.3)
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-20790641
- published11 Oct 2026
- disclosed19 Jul 2026
- creditUnknown
Introduced: 19 Jul 2026
CVE-2026-63816 (opens in a new tab)How to fix?
Upgrade torvalds/linux to version 5.19, 6.6.145, 6.12.96, 6.18.39, 7.1.3 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free in the f2fs_gc process. An attacker can achieve arbitrary kernel memory disclosure, heap corruption, and local privilege escalation by racing atomic write operations with garbage collection and inode eviction on F2FS filesystems. This is only exploitable if the attacker has local access and write permissions to files on an F2FS mount, and can trigger concurrent atomic writes and garbage collection.
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