What’s Vulnerable › Vulnerabilities

CVE-2026-28529: cryptodev-linux <= 1.14 get_userbuf Use After Free LPE

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-25 · updated 2026-08-17
• Weakness: CWE-416

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.

Affected products

• cryptodev-linux: through 1.14

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

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