Buffer Overflow Affecting torvalds/linux package, versions [5.19,6.6.79)[6.7,6.12.16)[6.13,6.13.4)
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-20698706
- published10 Oct 2026
- disclosed7 Mar 2025
- creditUnknown
Introduced: 7 Mar 2025
CVE-2025-21836 (opens in a new tab)How to fix?
Upgrade torvalds/linux to version 6.6.79, 6.12.16, 6.13.4 or higher.
Overview
Affected versions of this package are vulnerable to Buffer Overflow via the io_uring process. An attacker can gain arbitrary read and write access to kernel memory, potentially leading to privilege escalation or system compromise, by reusing a legacy buffer group that has been emptied and then upgraded through IORING_REGISTER_PBUF_RING and subsequent memory mapping.
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