drm/ttm: Drop tt->restore after successful restore
CVSS score
7.8
EPSS probability
%0.2
Risk score
0.0
Published
1 mo ago
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Vulnerability description
DayBreach CVE AI Research
CVE-2026-89815 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.
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
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 7.8 | CVSS V3_1 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | CVE CNA |
| 7.8 | CVSS V31 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-89815 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-89815 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
CVSS Vector Radar Chart
7.8 / 10Vulnerability Scoring Details
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HYama durumu bilinmiyor
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