Improper Input Validation Affecting torvalds/linux package, versions [6.11,6.18.57)[6.19,7.0.12)
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-UNMANAGED-TORVALDSLINUX-20790632
- published11 Oct 2026
- disclosed19 Jul 2026
- creditUnknown
Introduced: 19 Jul 2026
CVE-2026-63941 (opens in a new tab)How to fix?
Upgrade torvalds/linux to version 6.18.57, 7.0.12 or higher.
Overview
Affected versions of this package are vulnerable to Improper Input Validation through improper validation of the ZCR_EL2 register during SVE context restoration in nested virtualization environments. An attacker can achieve arbitrary kernel memory disclosure, memory corruption, or host code execution by manipulating the ZCR_EL1 accessor to set an uncapped vector length, resulting in out-of-bounds access to the host kernel's SVE state buffer. This is only exploitable if nested virtualization and SVE are enabled, and the attacker has control over both the L1 guest hypervisor and the L2 guest workload.
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