{ "cveId": "CVE-2026-89815", "url": "https://patchblox.com/security/cve/CVE-2026-89815", "summary": "CVE-2026-89815 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2026-89815, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "drm/ttm: Drop tt-\u003Erestore after successful restore", "description": "In the Linux kernel, the following vulnerability has been resolved: drm/ttm: Drop tt-\u003Erestore after successful restore ttm_pool_restore_and_alloc() can successfully complete the restore process via ttm_pool_restore_commit(), but tt-\u003Erestore 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-\u003Epages, leading to the stack trace below. Fix this by freeing and dropping tt-\u003Erestore in ttm_pool_restore_and_alloc() upon successful completion of the restore. 20545 [\u00A0 309.784531] RIP: 0010:sg_alloc_append_table_from_pages\u002B0x38c/0x490 20547 [\u00A0 309.809570] RSP: 0018:ffffc9000623b838 EFLAGS: 00010206 20548 [\u00A0 309.814827] RAX: 0000000000001000 RBX: ffff88816e42a160 RCX: 0000000000000000 20549 [\u00A0 309.821986] RDX: 0000000000002000 RSI: 0000000000000003 RDI: 0000000000001000 20550 [\u00A0 309.829147] RBP: ffff88816e42a168 R08: 0000000000000002 R09: 000000007ffff000 20551 [\u00A0 309.836310] R10: ffffc9000623b928 R11: 0000000000000000 R12: 000000007ffff000 20552 [\u00A0 309.843471] R13: ffff88815ba5a100 R14: 0000000000000000 R15: 0000000000000001 20553 [\u00A0 309.850634] FS:\u00A0 00007f9ff305e700(0000) GS:ffff888276c94000(0000) knlGS:0000000000000000 20554 [\u00A0 309.858749] CS:\u00A0 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 20555 [\u00A0 309.864519] CR2: 00007f9fca701000 CR3: 00000001565e2005 CR4: 0000000008f70ef0 20556 [\u00A0 309.871678] PKRU: 55555558 20557 [\u00A0 309.874403] Call Trace: 20558 [\u00A0 309.876866]\u00A0 \u003CTASK\u003E 20559 [\u00A0 309.878988]\u00A0 sg_alloc_table_from_pages_segment\u002B0x60/0x100 20560 [\u00A0 309.884415]\u00A0 ? ttm_resource_manager_usage\u002B0x36/0x60 [ttm] 20561 [\u00A0 309.889845]\u00A0 ? xe_tt_map_sg\u002B0x7d/0xd0 [xe] 20562 [\u00A0 309.894045]\u00A0 xe_tt_map_sg\u002B0x7d/0xd0 [xe] 20563 [\u00A0 309.898037]\u00A0 xe_bo_move\u002B0x927/0xaa0 [xe] 20564 [\u00A0 309.902029]\u00A0 ttm_bo_handle_move_mem\u002B0xba/0x170 [ttm] 20565 [\u00A0 309.907022]\u00A0 ttm_bo_validate\u002B0xbe/0x190 [ttm] 20566 [\u00A0 309.911405]\u00A0 xe_bo_validate\u002B0x9a/0x120 [xe] 20567 [\u00A0 309.915663]\u00A0 xe_gpuvm_validate\u002B0xd9/0x140 [xe] 20568 [\u00A0 309.920206]\u00A0 drm_gpuvm_validate\u002B0x2f0/0x5b0 [drm_gpuvm] 20569 [\u00A0 309.925459]\u00A0 ? drm_exec_lock_obj\u002B0x63/0x210 [drm_exec] 20570 [\u00A0 309.930627]\u00A0 xe_vm_validate_rebind\u002B0x46/0xb0 [xe] 20571 [\u00A0 309.935428]\u00A0 xe_exec_fn\u002B0x20/0x40 [xe] 20572 [\u00A0 309.939249]\u00A0 drm_gpuvm_exec_lock\u002B0x78/0xc0 [drm_gpuvm] 20573 [\u00A0 309.944410]\u00A0 xe_validation_exec_lock\u002B0x5a/0xa0 [xe] 20574 [\u00A0 309.949385]\u00A0 xe_exec_ioctl\u002B0x806/0xc30 [xe] 20575 [\u00A0 309.953639]\u00A0 ? ttwu_queue_wakelist\u002B0xd9/0xf0 20576 [\u00A0 309.957935]\u00A0 ? __pfx_xe_exec_fn\u002B0x10/0x10 [xe] 20577 [\u00A0 309.962449]\u00A0 ? __wake_up_common\u002B0x73/0xa0 20578 [\u00A0 309.966482]\u00A0 ? __pfx_xe_exec_ioctl\u002B0x10/0x10 [xe] 20579 [\u00A0 309.971263]\u00A0 drm_ioctl_kernel\u002B0xa3/0x100 20580 [\u00A0 309.975209]\u00A0 drm_ioctl\u002B0x213/0x440 20581 [\u00A0 309.978637]\u00A0 ? __pfx_xe_exec_ioctl\u002B0x10/0x10 [xe] 20582 [\u00A0 309.983415]\u00A0 xe_drm_ioctl\u002B0x67/0xd0 [xe] 20583 [\u00A0 309.987408]\u00A0 __x64_sys_ioctl\u002B0x7f/0xd0", "published": "2026-09-16T11:16:46Z", "severity": "high", "cvss": 7.8, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "epss": 0.00173, "epssPercentile": 0.06807, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89815", "fixes": [ { "platform": "linux", "product": "bpftool6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "bpftool6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel-livepatch-6.18.54-121.166", "release": "amzn 2023", "fixedVersion": "1:1.0-0.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo-common-aarch64", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo-common-x86_64", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-devel", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-headers", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-modules-extra", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-modules-extra-common", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-tools", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-tools-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-tools-devel", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "linux", "release": "Debian 14", "fixedVersion": "7.2.6-1", "fix": "DEBIAN-CVE-2026-89815", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89815", "released": "2026-09-23T19:19:02Z" }, { "platform": "linux", "product": "microvm-kernel6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "perf6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "perf6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "python3-perf6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "python3-perf6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" } ], "noFixYet": [], "dataAsOf": "2026-11-09T13:31:49Z", "attribution": { "text": "Data: Patchblox Patch Radar", "url": "https://patchblox.com/security/patch-radar", "terms": "https://patchblox.com/security/patch-radar/use-the-data" } }