CVE-2026-28529

HIGH

cryptodev-linux <= 1.14 get_userbuf Use After Free LPE

Title source: cna

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 (4)

[Exploit] https://nasm.re/posts/cryptodev-linux-vuln/

[Exploit] https://gist.github.com/n4sm/0fd2479e0c23e0fa2f192cd8fda45750

[Patch] https://github.com/cryptodev-linux/cryptodev-linux/pull/104

[Third Party Advisory] https://www.vulncheck.com/advisories/cryptodev-linux-get-userbuf-use-after-free-lpe

Scores

CVSS v4 8.5

EPSS 0.0002

EPSS Percentile 4.5%

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact total

Details

CWE

CWE-416

Status published

Products (1)

cryptodev-linux/cryptodev-linux < 1.14

Published Mar 25, 2026

Tracked Since Mar 25, 2026