CVE-2026-28529

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.

CVSS v4.0

8.5 HIGHCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.17% chance of exploitation in the next 30 days, 7th percentile

Published

2026-03-25

Updated

2026-07-14

Proof-of-concept exploits (2)

• https://nasm.re/posts/cryptodev-linux-vuln/
• https://gist.github.com/n4sm/0fd2479e0c23e0fa2f192cd8fda45750

References

• CVE Record
• NVD entry

Related

• CVE-2026-2852
• CVE-2026-2853
• CVE-2026-28517
• CVE-2026-2854
• CVE-2026-28516
• CVE-2026-2855