CVE-2026-80919

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: fix recursive ww_mutex acquire in amdgpu_devcoredump_format

When dumping IB contents from a hung job, amdgpu_devcoredump_format()

acquired the VM root PD's reservation via amdgpu_vm_lock_by_pasid() and

then, for each IB, called amdgpu_bo_reserve() on the BO backing the IB.

Both reservations are reservation_ww_class_mutex objects and neither

used a ww_acquire_ctx, which trips lockdep:

WARNING: possible recursive locking detected

--------------------------------------------

kworker/u128:0 is trying to acquire lock:

ffff88838b16e1f0 (reservation_ww_class_mutex){+.+.}-{4:4},

at: amdgpu_devcoredump_format+0x1594/0x23f0 [amdgpu]

but task is already holding lock:

ffff8882f82681f0 (reservation_ww_class_mutex){+.+.}-{4:4},

at: amdgpu_devcoredump_format+0x1594/0x23f0 [amdgpu]

Possible unsafe locking scenario:

CPU0

----

lock(reservation_ww_class_mutex);

lock(reserv

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References