Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: fix slab-use...
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: fix slab-use-after-free in amdgpu_userq_mgr_fini+0x70c
The issue was reproduced on NV10 using IGT pci_unplug test.
It is expected that amdgpu_driver_postclose_kms() is called prior to amdgpu_drm_release().
However, the bug is that amdgpu_fpriv was freed in amdgpu_driver_postclose_kms(), and then
later accessed in amdgpu_drm_release() via a call to amdgpu_userq_mgr_fini().
As a result, KASAN detected a use-after-free condition, as shown in the log below.
The proposed fix is to move the calls to amdgpu_eviction_fence_destroy() andamdgpu_userq_mgr_fini() into amdgpu_driver_postclose_kms(), so they are invoked beforeamdgpu_fpriv is freed.
This also ensures symmetry with the initialization path in amdgpu_driver_open_kms(),
where the following components are initialized:
amdgpu_userq_mgr_init()amdgpu_eviction_fence_init()amdgpu_ctx_mgr_init()
Correspondingly, in amdgpu_driver_postclose_kms() we should clean up using:
amdgpu_userq_mgr_fini()amdgpu_eviction_fence_destroy()amdgpu_ctx_mgr_fini()
This change eliminates the use-after-free and improves consistency in resource management between open and close paths.
[ +0.094367] ==================================================================
[ +0.000026] BUG: KASAN: slab-use-after-free in amdgpu_userq_mgr_fini+0x70c/0x730 [amdgpu]
[ +0.000866] Write of size 8 at addr ffff88811c068c60 by task amd_pci_unplug/1737
[ +0.000026] CPU: 3 UID: 0 PID: 1737 Comm: amd_pci_unplug Not tainted 6.14.0+ #2
[ +0.000008] Hardware name: ASUS System Product Name/ROG STRIX B550-F GAMING (WI-FI), BIOS 1401 12/03/2020
[ +0.000004] Call Trace:
[ +0.000004]
[ +0.000003] dump_stack_lvl+0x76/0xa0
[ +0.000010] print_report+0xce/0x600
[ +0.000009] ? amdgpu_userq_mgr_fini+0x70c/0x730 [amdgpu]
[ +0.000790] ? srso_return_thunk+0x5/0x5f
[ +0.000007] ? kasan_complete_mode_report_info+0x76/0x200
[ +0.000008] ? amdgpu_userq_mgr_fini+0x70c/0x730 [amdgpu]
[ +0.000684] kasan_report+0xbe/0x110
[ +0.000007] ? amdgpu_userq_mgr_fini+0x70c/0x730 [amdgpu]
[ +0.000601] __asan_report_store8_noabort+0x17/0x30
[ +0.000007] amdgpu_userq_mgr_fini+0x70c/0x730 [amdgpu]
[ +0.000801] ? __pfx_amdgpu_userq_mgr_fini+0x10/0x10 [amdgpu]
[ +0.000819] ? srso_return_thunk+0x5/0x5f
[ +0.000008] amdgpu_drm_release+0xa3/0xe0 [amdgpu]
[ +0.000604] __fput+0x354/0xa90
[ +0.000010] __fput_sync+0x59/0x80
[ +0.000005] __x64_sys_close+0x7d/0xe0
[ +0.000006] x64_sys_call+0x2505/0x26f0
[ +0.000006] do_syscall_64+0x7c/0x170
[ +0.000004] ? kasan_record_aux_stack+0xae/0xd0
[ +0.000005] ? srso_return_thunk+0x5/0x5f
[ +0.000004] ? kmem_cache_free+0x398/0x580
[ +0.000006] ? __fput+0x543/0xa90
[ +0.000006] ? srso_return_thunk+0x5/0x5f
[ +0.000004] ? __fput+0x543/0xa90
[ +0.000004] ? __kasan_check_read+0x11/0x20
[ +0.000007] ? srso_return_thunk+0x5/0x5f
[ +0.000004] ? __kasan_check_read+0x11/0x20
[ +0.000003] ? srso_return_thunk+0x5/0x5f
[ +0.000004] ? fpregs_assert_state_consistent+0x21/0xb0
[ +0.000006] ? srso_return_thunk+0x5/0x5f
[ +0.000004] ? syscall_exit_to_user_mode+0x4e/0x240
[ +0.000005] ? srso_return_thunk+0x5/0x5f
[ +0.000004] ? do_syscall_64+0x88/0x170
[ +0.000003] ? srso_return_thunk+0x5/0x5f
[ +0.000004] ? do_syscall_64+0x88/0x170
[ +0.000004] ? srso_return_thunk+0x5/0x5f
[ +0.000004] ? irqentry_exit+0x43/0x50
[ +0.000004] ? srso_return_thunk+0x5/0x5f
[ +0.000004] ? exc_page_fault+0x7c/0x110
[ +0.000006] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ +0.000005] RIP: 0033:0x7ffff7b14f67
[ +0.000005] Code: ff e8 0d 16 02 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 73 ba f7 ff
[ +0.000004] RSP: 002b:00007fffffffe358 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
[ +0.000006] RAX: ffffffffff
---truncated---
Impact
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is CVE-2025-38603? CVE-2025-38603 is a unknown-severity security vulnerability. No fixed version is listed yet.
- Is there a fix for CVE-2025-38603? No fixed version is listed for CVE-2025-38603 yet. Monitor the advisory for updates and apply mitigations in the interim.
- Is CVE-2025-38603 exploitable, and should I be worried? Whether CVE-2025-38603 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2025-38603 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.