CVE-2026-31431

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-place This mostly reverts commit 72548b093ee3 except for the copying of the associated data. There is no benefit in operating in-place in algif_aead since the source and destination come from different mappings. Get rid of all the complexity added for in-place operation and just copy the AD directly.

Proof of Concept (POC) Links

Explore how this vulnerability can be reproduced or exploited.

http://www.openwall.com/lists/oss-security/2026/04/29/23 http://www.openwall.com/lists/oss-security/2026/04/29/26 http://www.openwall.com/lists/oss-security/2026/04/30/18 http://www.openwall.com/lists/oss-security/2026/04/30/5 https://copy.fail https://websec.net/blog/cve-2026-31431-linux-algifaead-page-cache-write-to-root-69f38a4ccddd2db1f520f170 https://github.com/theori-io/copy-fail-CVE-2026-31431 https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-31431 https://xint.io/blog/copy-fail-linux-distributions#the-fix-6