Use After Free Affecting torvalds/linux package, versions [4.13,6.1.191)[6.2,6.6.160)[6.7,6.12.113)[6.13,6.17.3)
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-20700652
- published10 Oct 2026
- disclosed12 Nov 2025
- creditUnknown
Introduced: 12 Nov 2025
CVE-2025-40158 (opens in a new tab)How to fix?
Upgrade torvalds/linux to version 6.1.191, 6.6.160, 6.12.113, 6.17.3 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free in the ip6_output process. An attacker can cause kernel memory disclosure, arbitrary kernel memory writes, out-of-device packet leakage, and potentially achieve control-flow hijack or denial of service by sending crafted IPv6 packets to a vulnerable system acting as a router, gateway, or container/cloud host. This is only exploitable if the system is forwarding IPv6 packets and the attacker can trigger a race condition between packet processing and network device teardown.
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