Bug 2401539 (CVE-2023-53545)

Summary: CVE-2023-53545 kernel: drm/amdgpu: unmap and remove csa_va properly
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A locking violation was found in the Linux kernel's AMD GPU driver in the context save area cleanup path. A local user can trigger this issue when closing GPU contexts, causing the driver to unmap and remove virtual memory mappings without first reserving the root page directory buffer object. This violates kernel locking rules and triggers lockdep warnings, potentially leading to system instability and denial of service.
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Description OSIDB Bzimport 2025-10-04 16:06:16 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: unmap and remove csa_va properly

Root PD BO should be reserved before unmap and remove
a bo_va from VM otherwise lockdep will complain.

v2: check fpriv->csa_va is not NULL instead of amdgpu_mcbp (christian)

[14616.936827] WARNING: CPU: 6 PID: 1711 at drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1762 amdgpu_vm_bo_del+0x399/0x3f0 [amdgpu]
[14616.937096] Call Trace:
[14616.937097]  <TASK>
[14616.937102]  amdgpu_driver_postclose_kms+0x249/0x2f0 [amdgpu]
[14616.937187]  drm_file_free+0x1d6/0x300 [drm]
[14616.937207]  drm_close_helper.isra.0+0x62/0x70 [drm]
[14616.937220]  drm_release+0x5e/0x100 [drm]
[14616.937234]  __fput+0x9f/0x280
[14616.937239]  ____fput+0xe/0x20
[14616.937241]  task_work_run+0x61/0x90
[14616.937246]  exit_to_user_mode_prepare+0x215/0x220
[14616.937251]  syscall_exit_to_user_mode+0x2a/0x60
[14616.937254]  do_syscall_64+0x48/0x90
[14616.937257]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
Comment 1 Alexander B 2025-10-06 13:05:45 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100445-CVE-2023-53545-8d50@gregkh/T