Improper Restriction of Operations within the Bounds of a Memory Buffer Affecting torvalds/linux package, versions [5.3,6.1.191)[6.2,6.6.141)[6.7,6.12.91)[6.13,6.18.33)[6.19,7.0.10)
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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Start learning- Snyk IDSNYK-UNMANAGED-TORVALDSLINUX-20790522
- published11 Oct 2026
- disclosed19 Jul 2026
- creditUnknown
Introduced: 19 Jul 2026
CVE-2026-63856 (opens in a new tab)How to fix?
Upgrade torvalds/linux to version 6.1.191, 6.6.141, 6.12.91, 6.18.33, 7.0.10 or higher.
Overview
Affected versions of this package are vulnerable to Improper Restriction of Operations within the Bounds of a Memory Buffer via the amdgpu_vcn process. An attacker can cause memory corruption and denial of GPU service by submitting a crafted command stream with an unsupported 64-bit user fence to the VCN encoder or decoder rings through the AMDGPU DRM ioctl interface. This can lead to corruption of adjacent GPU buffers, disclosure of their contents, and potential GPU faults or resets, impacting all local consumers including the display stack.
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