CVE-2025-68793 (GCVE-0-2025-68793)
Vulnerability from cvelistv5
Published
2026-01-13 15:29
Modified
2026-10-19 18:05
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: fix a job->pasid access race in gpu recovery Avoid a possible UAF in GPU recovery due to a race between the sched timeout callback and the tdr work queue. The gpu recovery function calls drm_sched_stop() and later drm_sched_start(). drm_sched_start() restarts the tdr queue which will eventually free the job. If the tdr queue frees the job before time out callback completes, the job will be freed and we'll get a UAF when accessing the pasid. Cache it early to avoid the UAF. Example KASAN trace: [ 493.058141] BUG: KASAN: slab-use-after-free in amdgpu_device_gpu_recover+0x968/0x990 [amdgpu] [ 493.067530] Read of size 4 at addr ffff88b0ce3f794c by task kworker/u128:1/323 [ 493.074892] [ 493.076485] CPU: 9 UID: 0 PID: 323 Comm: kworker/u128:1 Tainted: G E 6.16.0-1289896.2.zuul.bf4f11df81c1410bbe901c4373305a31 #1 PREEMPT(voluntary) [ 493.076493] Tainted: [E]=UNSIGNED_MODULE [ 493.076495] Hardware name: TYAN B8021G88V2HR-2T/S8021GM2NR-2T, BIOS V1.03.B10 04/01/2019 [ 493.076500] Workqueue: amdgpu-reset-dev drm_sched_job_timedout [gpu_sched] [ 493.076512] Call Trace: [ 493.076515] <TASK> [ 493.076518] dump_stack_lvl+0x64/0x80 [ 493.076529] print_report+0xce/0x630 [ 493.076536] ? _raw_spin_lock_irqsave+0x86/0xd0 [ 493.076541] ? __pfx__raw_spin_lock_irqsave+0x10/0x10 [ 493.076545] ? amdgpu_device_gpu_recover+0x968/0x990 [amdgpu] [ 493.077253] kasan_report+0xb8/0xf0 [ 493.077258] ? amdgpu_device_gpu_recover+0x968/0x990 [amdgpu] [ 493.077965] amdgpu_device_gpu_recover+0x968/0x990 [amdgpu] [ 493.078672] ? __pfx_amdgpu_device_gpu_recover+0x10/0x10 [amdgpu] [ 493.079378] ? amdgpu_coredump+0x1fd/0x4c0 [amdgpu] [ 493.080111] amdgpu_job_timedout+0x642/0x1400 [amdgpu] [ 493.080903] ? pick_task_fair+0x24e/0x330 [ 493.080910] ? __pfx_amdgpu_job_timedout+0x10/0x10 [amdgpu] [ 493.081702] ? _raw_spin_lock+0x75/0xc0 [ 493.081708] ? __pfx__raw_spin_lock+0x10/0x10 [ 493.081712] drm_sched_job_timedout+0x1b0/0x4b0 [gpu_sched] [ 493.081721] ? __pfx__raw_spin_lock_irq+0x10/0x10 [ 493.081725] process_one_work+0x679/0xff0 [ 493.081732] worker_thread+0x6ce/0xfd0 [ 493.081736] ? __pfx_worker_thread+0x10/0x10 [ 493.081739] kthread+0x376/0x730 [ 493.081744] ? __pfx_kthread+0x10/0x10 [ 493.081748] ? __pfx__raw_spin_lock_irq+0x10/0x10 [ 493.081751] ? __pfx_kthread+0x10/0x10 [ 493.081755] ret_from_fork+0x247/0x330 [ 493.081761] ? __pfx_kthread+0x10/0x10 [ 493.081764] ret_from_fork_asm+0x1a/0x30 [ 493.081771] </TASK> (cherry picked from commit 20880a3fd5dd7bca1a079534cf6596bda92e107d)
References
Impacted products
Vendor Product Version
Linux Linux Version: a72002cb181f350734108228b24c5d10d358f95a
Version: a72002cb181f350734108228b24c5d10d358f95a
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix a job-\u003epasid access race in gpu recovery\n\nAvoid a possible UAF in GPU recovery due to a race between\nthe sched timeout callback and the tdr work queue.\n\nThe gpu recovery function calls drm_sched_stop() and\nlater drm_sched_start().  drm_sched_start() restarts\nthe tdr queue which will eventually free the job.  If\nthe tdr queue frees the job before time out callback\ncompletes, the job will be freed and we\u0027ll get a UAF\nwhen accessing the pasid.  Cache it early to avoid the\nUAF.\n\nExample KASAN trace:\n[  493.058141] BUG: KASAN: slab-use-after-free in amdgpu_device_gpu_recover+0x968/0x990 [amdgpu]\n[  493.067530] Read of size 4 at addr ffff88b0ce3f794c by task kworker/u128:1/323\n[  493.074892]\n[  493.076485] CPU: 9 UID: 0 PID: 323 Comm: kworker/u128:1 Tainted: G            E       6.16.0-1289896.2.zuul.bf4f11df81c1410bbe901c4373305a31 #1 PREEMPT(voluntary)\n[  493.076493] Tainted: [E]=UNSIGNED_MODULE\n[  493.076495] Hardware name: TYAN B8021G88V2HR-2T/S8021GM2NR-2T, BIOS V1.03.B10 04/01/2019\n[  493.076500] Workqueue: amdgpu-reset-dev drm_sched_job_timedout [gpu_sched]\n[  493.076512] Call Trace:\n[  493.076515]  \u003cTASK\u003e\n[  493.076518]  dump_stack_lvl+0x64/0x80\n[  493.076529]  print_report+0xce/0x630\n[  493.076536]  ? _raw_spin_lock_irqsave+0x86/0xd0\n[  493.076541]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n[  493.076545]  ? amdgpu_device_gpu_recover+0x968/0x990 [amdgpu]\n[  493.077253]  kasan_report+0xb8/0xf0\n[  493.077258]  ? amdgpu_device_gpu_recover+0x968/0x990 [amdgpu]\n[  493.077965]  amdgpu_device_gpu_recover+0x968/0x990 [amdgpu]\n[  493.078672]  ? __pfx_amdgpu_device_gpu_recover+0x10/0x10 [amdgpu]\n[  493.079378]  ? amdgpu_coredump+0x1fd/0x4c0 [amdgpu]\n[  493.080111]  amdgpu_job_timedout+0x642/0x1400 [amdgpu]\n[  493.080903]  ? pick_task_fair+0x24e/0x330\n[  493.080910]  ? __pfx_amdgpu_job_timedout+0x10/0x10 [amdgpu]\n[  493.081702]  ? _raw_spin_lock+0x75/0xc0\n[  493.081708]  ? __pfx__raw_spin_lock+0x10/0x10\n[  493.081712]  drm_sched_job_timedout+0x1b0/0x4b0 [gpu_sched]\n[  493.081721]  ? __pfx__raw_spin_lock_irq+0x10/0x10\n[  493.081725]  process_one_work+0x679/0xff0\n[  493.081732]  worker_thread+0x6ce/0xfd0\n[  493.081736]  ? __pfx_worker_thread+0x10/0x10\n[  493.081739]  kthread+0x376/0x730\n[  493.081744]  ? __pfx_kthread+0x10/0x10\n[  493.081748]  ? __pfx__raw_spin_lock_irq+0x10/0x10\n[  493.081751]  ? __pfx_kthread+0x10/0x10\n[  493.081755]  ret_from_fork+0x247/0x330\n[  493.081761]  ? __pfx_kthread+0x10/0x10\n[  493.081764]  ret_from_fork_asm+0x1a/0x30\n[  493.081771]  \u003c/TASK\u003e\n\n(cherry picked from commit 20880a3fd5dd7bca1a079534cf6596bda92e107d)"
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              "value": "AV:L - The vulnerability is reached through local AMDGPU command submission via a DRM render or primary device node; no network or physical protocol reaches this path.\nAC:L - The attacker controls job submission and can deliberately hang the GPU while maintaining concurrent submissions or heap spraying; the race is repeatable and requires no victim-controlled condition.\nPR:L - DRM_IOCTL_AMDGPU_CS is marked DRM_RENDER_ALLOW, and normal contexts require no capability; only ordinary unprivileged access to the AMDGPU render node is needed.\nUI:N - After the attacker submits the hanging job, the scheduler timeout, recovery, object freeing, and stale access occur automatically without another user\u0027s participation.\nS:U - The vulnerable DRM client and the affected host kernel remain under the same security authority; this is standard local kernel compromise rather than a VM or IOMMU boundary escape.\nC:H - This is a kernel slab use-after-free involving an attacker-created, variable-sized amdgpu_job allocation that can be reclaimed through heap spraying, making high-impact kernel memory disclosure defensible.\nI:H - Reclaiming the freed job with attacker-influenced allocations can support UAF exploitation and potential kernel memory manipulation or control-flow hijacking, resulting in complete integrity loss.\nA:H - The UAF was observed by KASAN in GPU recovery and can cause an oops or panic; repeated malicious hangs and recovery failures can also deny the GPU to all system users."
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    "dateUpdated": "2026-10-19T18:05:07.405Z",
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If\\nthe tdr queue frees the job before time out callback\\ncompletes, the job will be freed and we\u0027ll get a UAF\\nwhen accessing the pasid.  Cache it early to avoid the\\nUAF.\\n\\nExample KASAN trace:\\n[  493.058141] BUG: KASAN: slab-use-after-free in amdgpu_device_gpu_recover+0x968/0x990 [amdgpu]\\n[  493.067530] Read of size 4 at addr ffff88b0ce3f794c by task kworker/u128:1/323\\n[  493.074892]\\n[  493.076485] CPU: 9 UID: 0 PID: 323 Comm: kworker/u128:1 Tainted: G            E       6.16.0-1289896.2.zuul.bf4f11df81c1410bbe901c4373305a31 #1 PREEMPT(voluntary)\\n[  493.076493] Tainted: [E]=UNSIGNED_MODULE\\n[  493.076495] Hardware name: TYAN B8021G88V2HR-2T/S8021GM2NR-2T, BIOS V1.03.B10 04/01/2019\\n[  493.076500] Workqueue: amdgpu-reset-dev drm_sched_job_timedout [gpu_sched]\\n[  493.076512] Call Trace:\\n[  493.076515]  \u003cTASK\u003e\\n[  493.076518]  dump_stack_lvl+0x64/0x80\\n[  493.076529]  print_report+0xce/0x630\\n[  493.076536]  ? _raw_spin_lock_irqsave+0x86/0xd0\\n[  493.076541]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\\n[  493.076545]  ? amdgpu_device_gpu_recover+0x968/0x990 [amdgpu]\\n[  493.077253]  kasan_report+0xb8/0xf0\\n[  493.077258]  ? amdgpu_device_gpu_recover+0x968/0x990 [amdgpu]\\n[  493.077965]  amdgpu_device_gpu_recover+0x968/0x990 [amdgpu]\\n[  493.078672]  ? __pfx_amdgpu_device_gpu_recover+0x10/0x10 [amdgpu]\\n[  493.079378]  ? amdgpu_coredump+0x1fd/0x4c0 [amdgpu]\\n[  493.080111]  amdgpu_job_timedout+0x642/0x1400 [amdgpu]\\n[  493.080903]  ? pick_task_fair+0x24e/0x330\\n[  493.080910]  ? __pfx_amdgpu_job_timedout+0x10/0x10 [amdgpu]\\n[  493.081702]  ? _raw_spin_lock+0x75/0xc0\\n[  493.081708]  ? __pfx__raw_spin_lock+0x10/0x10\\n[  493.081712]  drm_sched_job_timedout+0x1b0/0x4b0 [gpu_sched]\\n[  493.081721]  ? __pfx__raw_spin_lock_irq+0x10/0x10\\n[  493.081725]  process_one_work+0x679/0xff0\\n[  493.081732]  worker_thread+0x6ce/0xfd0\\n[  493.081736]  ? __pfx_worker_thread+0x10/0x10\\n[  493.081739]  kthread+0x376/0x730\\n[  493.081744]  ? __pfx_kthread+0x10/0x10\\n[  493.081748]  ? __pfx__raw_spin_lock_irq+0x10/0x10\\n[  493.081751]  ? __pfx_kthread+0x10/0x10\\n[  493.081755]  ret_from_fork+0x247/0x330\\n[  493.081761]  ? __pfx_kthread+0x10/0x10\\n[  493.081764]  ret_from_fork_asm+0x1a/0x30\\n[  493.081771]  \u003c/TASK\u003e\\n\\n(cherry picked from commit 20880a3fd5dd7bca1a079534cf6596bda92e107d)\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.3\", \"versionStartIncluding\": \"6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"6.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:11:29.613Z\"}}}",
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