[PATCH v2 0/2] Reproducer for ghostlock

Test for CVE-2026-43499 (GhostLock), a stack use-after-free in the
rtmutex PI code, fixed in kernel v7.1:
3bfdc63936dd ("rtmutex: Use waiter::task instead of current in remove_waiter()")

Reproducer based on the Nebula Security writeup and open-sourced PoC
(https://nebusec.ai/research/ionstack-part-2/, https://github.com/NebuSec/CyberMeowfia).
Beware, this test will crash the system on a vulnerable kernel.

Assisted by Kimi K3 for the analysis and written mostly with Gemini Pro
3.1 Max.

Signed-off-by: Andrea Cervesato <andrea.cervesato-IBi9RG/[email protected]>
---
Changes in v2:
- fix build
- fix 32bit run
- Link to v1: https://lore.kernel.org/20260801-cve-ghostlock-v1-0-178f698f9702-IBi9RG/[email protected]

---
Andrea Cervesato (2):
      lapi/prctl: add more fallback definitions
      cve: add CVE-2026-43499 reproducer

 configure.ac              |   2 +
 include/lapi/prctl.h      |  25 +++++
 runtest/cve               |   1 +
 testcases/cve/.gitignore  |   1 +
 testcases/cve/Makefile    |   2 +-
 testcases/cve/ghostlock.c | 252 ++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 282 insertions(+), 1 deletion(-)
---
base-commit: 6891f922f21a56238d3225c9a83e08f4f7c1765b
change-id: 20260801-cve-ghostlock-6ee4b2f69fd6

Best regards,
-- 
Andrea Cervesato <andrea.cervesato-IBi9RG/[email protected]>


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