Use After Free Affecting torvalds/linux package, versions [5.5, 5.10.235)[5.11.0, 5.15.179)[6.0.0, 6.1.131)[6.2.0, 6.6.79)[6.7.0, 6.12.16)[6.13.0, 6.13.4)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-10339387
- published12 Jun 2025
- disclosed26 Feb 2025
- creditMichael Hoefler
Introduced: 26 Feb 2025
CVE-2025-21756 (opens in a new tab)How to fix?
Upgrade torvalds/linux to version 5.10.235, 5.15.179, 6.1.131, 6.6.79, 6.12.16, 6.13.4 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free through socket unbinding during a transport reassignment. After freeing the vsock object, an attacker can leverage it to gain a better primitive and escalate privileges on the system. While there are limiting factors including AppArmor which ensures a crash before it can be leveraged, it is still possible to abuse the dangling pointer by using a skc_net overwrite to defeat kASLR and land at a known offset in the vsock object.