EUVD-2026-80415
GHSA-w5c5-94w7-pxg8
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local render-node access (PR:L, AV:L); AC:H because a specific backup→successful-restore→re-entry sequence must be triggered; stale handles yield memory corruption spanning C/I/A.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
Lifecycle Timeline
5DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
drm/ttm: Drop tt->restore after successful restore
ttm_pool_restore_and_alloc() can successfully complete the restore process via ttm_pool_restore_commit(), but tt->restore is not dropped afterward. As a result, subsequent backup/restore flows observe what appears to be a completed restore, while in reality shmem handles are still installed in tt->pages, leading to the stack trace below.
Fix this by freeing and dropping tt->restore in ttm_pool_restore_and_alloc() upon successful completion of the restore.
20545 [ 309.784531] RIP: 0010:sg_alloc_append_table_from_pages+0x38c/0x490 20547 [ 309.809570] RSP: 0018:ffffc9000623b838 EFLAGS: 00010206 20548 [ 309.814827] RAX: 0000000000001000 RBX: ffff88816e42a160 RCX: 0000000000000000 20549 [ 309.821986] RDX: 0000000000002000 RSI: 0000000000000003 RDI: 0000000000001000 20550 [ 309.829147] RBP: ffff88816e42a168 R08: 0000000000000002 R09: 000000007ffff000 20551 [ 309.836310] R10: ffffc9000623b928 R11: 0000000000000000 R12: 000000007ffff000 20552 [ 309.843471] R13: ffff88815ba5a100 R14: 0000000000000000 R15: 0000000000000001 20553 [ 309.850634] FS: 00007f9ff305e700(0000) GS:ffff888276c94000(0000) knlGS:0000000000000000 20554 [ 309.858749] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 20555 [ 309.864519] CR2: 00007f9fca701000 CR3: 00000001565e2005 CR4: 0000000008f70ef0 20556 [ 309.871678] PKRU: 55555558 20557 [ 309.874403] Call Trace: 20558 [ 309.876866] <TASK> 20559 [ 309.878988] sg_alloc_table_from_pages_segment+0x60/0x100 20560 [ 309.884415] ? ttm_resource_manager_usage+0x36/0x60 [ttm] 20561 [ 309.889845] ? xe_tt_map_sg+0x7d/0xd0 [xe] 20562 [ 309.894045] xe_tt_map_sg+0x7d/0xd0 [xe] 20563 [ 309.898037] xe_bo_move+0x927/0xaa0 [xe] 20564 [ 309.902029] ttm_bo_handle_move_mem+0xba/0x170 [ttm] 20565 [ 309.907022] ttm_bo_validate+0xbe/0x190 [ttm] 20566 [ 309.911405] xe_bo_validate+0x9a/0x120 [xe] 20567 [ 309.915663] xe_gpuvm_validate+0xd9/0x140 [xe] 20568 [ 309.920206] drm_gpuvm_validate+0x2f0/0x5b0 [drm_gpuvm] 20569 [ 309.925459] ? drm_exec_lock_obj+0x63/0x210 [drm_exec] 20570 [ 309.930627] xe_vm_validate_rebind+0x46/0xb0 [xe] 20571 [ 309.935428] xe_exec_fn+0x20/0x40 [xe] 20572 [ 309.939249] drm_gpuvm_exec_lock+0x78/0xc0 [drm_gpuvm] 20573 [ 309.944410] xe_validation_exec_lock+0x5a/0xa0 [xe] 20574 [ 309.949385] xe_exec_ioctl+0x806/0xc30 [xe] 20575 [ 309.953639] ? ttwu_queue_wakelist+0xd9/0xf0 20576 [ 309.957935] ? __pfx_xe_exec_fn+0x10/0x10 [xe] 20577 [ 309.962449] ? __wake_up_common+0x73/0xa0 20578 [ 309.966482] ? __pfx_xe_exec_ioctl+0x10/0x10 [xe] 20579 [ 309.971263] drm_ioctl_kernel+0xa3/0x100 20580 [ 309.975209] drm_ioctl+0x213/0x440 20581 [ 309.978637] ? __pfx_xe_exec_ioctl+0x10/0x10 [xe] 20582 [ 309.983415] xe_drm_ioctl+0x67/0xd0 [xe] 20583 [ 309.987408] __x64_sys_ioctl+0x7f/0xd0
AnalysisAI
Memory corruption in the Linux kernel's TTM pool for Intel Xe graphics allows a local attacker with access to the DRM render node to trigger a stale restore state, leading to kernel crashes or potential privilege escalation. The flaw affects Linux 6.15 through the fix in 7.2.5/7.3-rc1 and requires the TTM backup/restore path (memory pressure or suspend/resume) to be exercised; no public exploit code or active exploitation has been identified at time of analysis.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires local access to a host running an affected Linux kernel (6.15 through the fix in 7.2.5 / 7.3-rc1) with an Intel GPU using the xe driver and the TTM pool backup/restore (shrinker or suspend/resume) machinery active. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H = 7.8 High) is internally consistent in describing a local, low-privilege memory-management flaw with full-triad impact, but the AC:L rating is optimistic: triggering the bug requires the TTM pool backup/restore path (memory-pressure-driven shrink or suspend/resume of GPU buffer objects) to actually run and complete a restore, then be re-entered - a state-dependent sequence rather than a trivially reproducible primitive, so AC:H is more defensible. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released patch by upgrading to Linux kernel 7.2.5 or 7.3-rc1 (or later), which include commit 941ac10529b3be5965a88d432a161ab459672ba8 for stable and commit a46ab76b6cf5478e2ac7b942a377c7a1827b436a for mainline. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every Linux host running kernel 6.15 or later with Intel Xe graphics, confirm exposure by checking the running kernel version and whether /dev/dri/renderD* is reachable by non-privileged accounts, and tighten render-node permissions to trusted groups only; on unpatched systems that cannot be rebooted immediately, reduce unnecessary suspend/resume cycling and memory pressure where operationally feasible. …
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