184 lines
13 KiB
JSON
184 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-68263",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-30T09:28:09.378Z",
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"datePublished": "2026-08-10T12:01:37.571Z",
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"dateUpdated": "2026-08-17T05:01:55.726Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-17T05:01:55.726Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/imagination: Fix double call to drm_sched_entity_fini()\n\nCall sequence of double call:\npvr_context_destroy\n pvr_context_kill_queues\n pvr_queue_kill\n drm_sched_entity_destroy\n drm_sched_entity_fini // here\n pvr_context_put\n kref_put(..., pvr_context_release)\n pvr_context_destroy_queues\n pvr_queue_destroy\n drm_sched_entity_fini // here\n\nCall to drm_sched_entity_destroy() from pvr_context_kill_queues() calls\ndrm_sched_entity_flush() + drm_sched_entity_fini().\ndrm_sched_entity_flush() ensures all pending jobs are completed and\ndrm_sched_entity_fini() ensures no further submission is allowed as\nper expectation from pvr_context_kill_queues(). Double call to\ndrm_sched_entity_fini() is misuse of the API so keep call only in\npvr_context_create() failure path.\n\nStack trace for issue with addition of refcounting for DRM entity\nstats in commit fd177135f0e6 (\"drm/sched: Account entity GPU time\"):\n\n[ 789.490527] ------------[ cut here ]------------\n[ 789.490559] refcount_t: underflow; use-after-free.\n[ 789.490657] WARNING: lib/refcount.c:28 at refcount_warn_saturate+0xf4/0x144, CPU#0: kworker/u16:1/440\n[ 789.490695] Modules linked in: powervr drm_gpuvm drm_exec gpu_sched drm_shmem_helper xhci_plat_hcd xhci_hcd dwc3 usbcore usb_common snd_soc_simple_card snd_soc_simple_card_utils sa2ul sha512 sha256 dwc3_am62 sha1 authenc rti_wdt libsha512 at24 sch_fq_codel fuse dm_mod ipv6\n[ 789.490798] CPU: 0 UID: 0 PID: 440 Comm: kworker/u16:1 Not tainted 7.0.0-rc7-02049-g5e2c0700091b #22 PREEMPT\n[ 789.490809] Hardware name: Texas Instruments AM625 SK (DT)\n[ 789.490815] Workqueue: powervr-sched pvr_queue_fence_release_work [powervr]\n[ 789.490868] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ 789.490876] pc : refcount_warn_saturate+0xf4/0x144\n[ 789.490884] lr : refcount_warn_saturate+0xf4/0x144\n[ 789.490892] sp : ffff8000822cbcc0\n[ 789.490895] x29: ffff8000822cbcc0 x28: 0000000000000000 x27: 0000000000000000\n[ 789.490909] x26: 0000000000000000 x25: ffff800081b1e338 x24: ffff000004541405\n[ 789.490922] x23: ffff000004bea950 x22: ffff00000042e400 x21: ffff000007123e30\n[ 789.490935] x20: ffff000007123000 x19: ffff000007a80d50 x18: fffffffffffe7768\n[ 789.490948] x17: 74736574202c6e6f x16: 697461746e656d65 x15: ffff800081b269f0\n[ 789.490962] x14: 0000000000000030 x13: ffff800081b26a70 x12: 0000000000000211\n[ 789.490975] x11: 00000000000000c0 x10: 0000000000000b50 x9 : ffff8000822cbb30\n[ 789.490988] x8 : ffff0000014e7bb0 x7 : ffff00007725e780 x6 : 0000000372a05f49\n[ 789.491001] x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000010\n[ 789.491013] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000014e7000\n[ 789.491027] Call trace:\n[ 789.491032] refcount_warn_saturate+0xf4/0x144 (P)\n[ 789.491043] drm_sched_entity_fini+0x164/0x18c [gpu_sched]\n[ 789.491081] pvr_queue_destroy+0x64/0x134 [powervr]\n[ 789.491110] pvr_context_destroy_queues+0x34/0x64 [powervr]\n[ 789.491138] pvr_context_release+0x70/0xac [powervr]\n[ 789.491166] pvr_context_put.part.0+0x5c/0x7c [powervr]\n[ 789.491193] pvr_context_put+0x14/0x24 [powervr]\n[ 789.491221] pvr_queue_fence_release_work+0x20/0x38 [powervr]\n[ 789.491249] process_one_work+0x160/0x4c4\n[ 789.491264] worker_thread+0x188/0x310\n[ 789.491276] kthread+0x130/0x13c\n[ 789.491287] ret_from_fork+0x10/0x20\n[ 789.491300] ---[ end trace 0000000000000000 ]---"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is reached only through the PowerVR DRM render node (/dev/dri/renderD*) via the DRM_IOCTL_PVR_CREATE_CONTEXT / SUBMIT_JOBS / DESTROY_CONTEXT ioctls or by closing the DRM file descriptor, which requires local access to the device.\nAC:L - pvr_context_destroy() unconditionally calls drm_sched_entity_destroy() (fini #1) and pvr_context_release() then calls drm_sched_entity_fini() again, so the extra stats kref put happens deterministically on every context teardown; the attacker also controls job submission, so keeping a job reference alive over the free window is trivially arranged.\nPR:L - All involved ioctls are marked DRM_RENDER_ALLOW, so any unprivileged local user (or sandboxed app on Android/embedded systems) that can open the render node — the normal configuration for graphics clients — can drive the path; no capability is required.\nUI:N - The attacker performs the whole sequence itself with open(), a few ioctls and close(); no action by another user or administrator is needed.\nS:U - The corruption stays within kernel memory managed by the same kernel security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The duplicate drm_sched_entity_stats_put() frees the kref'd drm_sched_entity_stats slab object while in-flight jobs still hold pointers to it, so subsequent scheduler accesses read freed memory that an unprivileged process can reallocate and spray, allowing disclosure of arbitrary kernel data.\nI:H - After the premature free, drm_sched_entity_stats_job_add_gpu_time() takes stats->lock and writes stats->runtime into reclaimed memory, giving a use-after-free write into an attacker-groomable kmalloc object that can be leveraged for privilege escalation.\nA:H - The refcount underflow triggers a WARNING splat and the resulting use-after-free on the entity stats object corrupts kernel heap state from the scheduler workqueue, readily causing an oops or panic."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/imagination/pvr_context.c",
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"drivers/gpu/drm/imagination/pvr_queue.c",
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"drivers/gpu/drm/imagination/pvr_queue.h"
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"drivers/gpu/drm/imagination/pvr_context.c",
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"drivers/gpu/drm/imagination/pvr_queue.c",
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"drivers/gpu/drm/imagination/pvr_queue.h"
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}
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],
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"title": "drm/imagination: Fix double call to drm_sched_entity_fini()",
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