CVE-2026-28529

Description

cryptodev-linux version 1.14 and prior contain a page reference handling flaw in the get_userbuf function of the /dev/crypto device driver that allows local users to trigger use-after-free conditions. Attackers with access to the /dev/crypto interface can repeatedly decrement reference counts of controlled pages to achieve local privilege escalation.

References

• https://gist.github.com/n4sm/0fd2479e0c23e0fa2f192cd8fda45750
• https://github.com/cryptodev-linux/cryptodev-linux/pull/104
• https://nasm.re/posts/cryptodev-linux-vuln/
• https://www.vulncheck.com/advisories/cryptodev-linux-get-userbuf-use-after-free-lpe