CVE-2026-31479

{"id": "CVE-2026-31479", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31479", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:10:03.706925Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "8f33b4f054fc29a4774d8d10116ef460faeb84a8", "lessThan": "ccd41f110c608b3cc347b9be881c3e72cd634b2b", "versionType": "git"}, {"status": "affected", "version": "8f33b4f054fc29a4774d8d10116ef460faeb84a8", "lessThan": "5eda8001ebb5269755608d678dd1f3928ab077c9", "versionType": "git"}, {"status": "affected", "version": "8f33b4f054fc29a4774d8d10116ef460faeb84a8", "lessThan": "e6ba1749549e87b83c0c4885d84b543687c3740e", "versionType": "git"}, {"status": "affected", "version": "8f33b4f054fc29a4774d8d10116ef460faeb84a8", "lessThan": "bfe9e314d7574d1c5c851972e7aee342733819d2", "versionType": "git"}], "programFiles": ["drivers/gpu/drm/xe/xe_pt.c", "drivers/gpu/drm/xe/xe_vm.c", "drivers/gpu/drm/xe/xe_vm_types.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"status": "unaffected", "version": "0", "lessThan": "6.8", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.80", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.21", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.11", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/gpu/drm/xe/xe_pt.c", "drivers/gpu/drm/xe/xe_vm.c", "drivers/gpu/drm/xe/xe_vm_types.h"], "defaultStatus": "affected"}]}], "published": "2026-04-22T14:16:44.993", "references": [{"url": "https://git.kernel.org/stable/c/5eda8001ebb5269755608d678dd1f3928ab077c9", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/bfe9e314d7574d1c5c851972e7aee342733819d2", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ccd41f110c608b3cc347b9be881c3e72cd634b2b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e6ba1749549e87b83c0c4885d84b543687c3740e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-662"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: always keep track of remap prev/next\n\nDuring 3D workload, user is reporting hitting:\n\n[ 413.361679] WARNING: drivers/gpu/drm/xe/xe_vm.c:1217 at vm_bind_ioctl_ops_unwind+0x1e2/0x2e0 [xe], CPU#7: vkd3d_queue/9925\n[ 413.361944] CPU: 7 UID: 1000 PID: 9925 Comm: vkd3d_queue Kdump: loaded Not tainted 7.0.0-070000rc3-generic #202603090038 PREEMPT(lazy)\n[ 413.361949] RIP: 0010:vm_bind_ioctl_ops_unwind+0x1e2/0x2e0 [xe]\n[ 413.362074] RSP: 0018:ffffd4c25c3df930 EFLAGS: 00010282\n[ 413.362077] RAX: 0000000000000000 RBX: ffff8f3ee817ed10 RCX: 0000000000000000\n[ 413.362078] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\n[ 413.362079] RBP: ffffd4c25c3df980 R08: 0000000000000000 R09: 0000000000000000\n[ 413.362081] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8f41fbf99380\n[ 413.362082] R13: ffff8f3ee817e968 R14: 00000000ffffffef R15: ffff8f43d00bd380\n[ 413.362083] FS: 00000001040ff6c0(0000) GS:ffff8f4696d89000(0000) knlGS:00000000330b0000\n[ 413.362085] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033\n[ 413.362086] CR2: 00007ddfc4747000 CR3: 00000002e6262005 CR4: 0000000000f72ef0\n[ 413.362088] PKRU: 55555554\n[ 413.362089] Call Trace:\n[ 413.362092] <TASK>\n[ 413.362096] xe_vm_bind_ioctl+0xa9a/0xc60 [xe]\n\nWhich seems to hint that the vma we are re-inserting for the ops unwind\nis either invalid or overlapping with something already inserted in the\nvm. It shouldn't be invalid since this is a re-insertion, so must have\nworked before. Leaving the likely culprit as something already placed\nwhere we want to insert the vma.\n\nFollowing from that, for the case where we do something like a rebind in\nthe middle of a vma, and one or both mapped ends are already compatible,\nwe skip doing the rebind of those vma and set next/prev to NULL. As well\nas then adjust the original unmap va range, to avoid unmapping the ends.\nHowever, if we trigger the unwind path, we end up with three va, with\nthe two ends never being removed and the original va range in the middle\nstill being the shrunken size.\n\nIf this occurs, one failure mode is when another unwind op needs to\ninteract with that range, which can happen with a vector of binds. For\nexample, if we need to re-insert something in place of the original va.\nIn this case the va is still the shrunken version, so when removing it\nand then doing a re-insert it can overlap with the ends, which were\nnever removed, triggering a warning like above, plus leaving the vm in a\nbad state.\n\nWith that, we need two things here:\n\n 1) Stop nuking the prev/next tracking for the skip cases. Instead\n relying on checking for skip prev/next, where needed. That way on the\n unwind path, we now correctly remove both ends.\n\n 2) Undo the unmap va shrinkage, on the unwind path. With the two ends\n now removed the unmap va should expand back to the original size again,\n before re-insertion.\n\nv2:\n - Update the explanation in the commit message, based on an actual IGT of\n triggering this issue, rather than conjecture.\n - Also undo the unmap shrinkage, for the skip case. With the two ends\n now removed, the original unmap va range should expand back to the\n original range.\nv3:\n - Track the old start/range separately. vma_size/start() uses the va\n info directly.\n\n(cherry picked from commit aec6969f75afbf4e01fd5fb5850ed3e9c27043ac)"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/xe: siempre mantener un registro de prev/next de reasignaci\u00f3n\n\nDurante una carga de trabajo 3D, el usuario informa que se encuentra con:\n\n[ 413.361679] WARNING: drivers/gpu/drm/xe/xe_vm.c:1217 at vm_bind_ioctl_ops_unwind+0x1e2/0x2e0 [xe], CPU#7: vkd3d_queue/9925\n[ 413.361944] CPU: 7 UID: 1000 PID: 9925 Comm: vkd3d_queue Kdump: loaded Not tainted 7.0.0-070000rc3-generic #202603090038 PREEMPT(lazy)\n[ 413.361949] RIP: 0010:vm_bind_ioctl_ops_unwind+0x1e2/0x2e0 [xe]\n[ 413.362074] RSP: 0018:ffffd4c25c3df930 EFLAGS: 00010282\n[ 413.362077] RAX: 0000000000000000 RBX: ffff8f3ee817ed10 RCX: 0000000000000000\n[ 413.362078] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\n[ 413.362079] RBP: ffffd4c25c3df980 R08: 0000000000000000 R09: 0000000000000000\n[ 413.362081] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8f41fbf99380\n[ 413.362082] R13: ffff8f3ee817e968 R14: 00000000ffffffef R15: ffff8f43d00bd380\n[ 413.362083] FS: 00000001040ff6c0(0000) GS:ffff8f4696d89000(0000) knlGS:00000000330b0000\n[ 413.362085] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033\n[ 413.362086] CR2: 00007ddfc4747000 CR3: 00000002e6262005 CR4: 0000000000f72ef0\n[ 413.362088] PKRU: 55555554\n[ 413.362089] Call Trace:\n[ 413.362092] [TASK]\n[ 413.362096] xe_vm_bind_ioctl+0xa9a/0xc60 [xe]\n\nLo que parece sugerir que el vma que estamos reinsertando para el desenrollado de operaciones es inv\u00e1lido o se superpone con algo ya insertado en la vm. No deber\u00eda ser inv\u00e1lido ya que esto es una reinserci\u00f3n, por lo que debe haber funcionado antes. Dejando al culpable probable como algo ya colocado donde queremos insertar el vma.\n\nA partir de eso, para el caso en el que hacemos algo como un rebind en medio de un vma, y uno o ambos extremos mapeados ya son compatibles, omitimos hacer el rebind de esos vma y establecemos next/prev en NULL. As\u00ed como luego ajustamos el rango va de desmapeo original, para evitar desmapear los extremos. Sin embargo, si activamos la ruta de desenrollado, terminamos con tres va, con los dos extremos nunca siendo eliminados y el rango va original en el medio a\u00fan siendo del tama\u00f1o reducido.\n\nSi esto ocurre, un modo de fallo es cuando otra operaci\u00f3n de desenrollado necesita interactuar con ese rango, lo que puede ocurrir con un vector de enlaces. Por ejemplo, si necesitamos reinsertar algo en lugar del va original. En este caso, el va sigue siendo la versi\u00f3n reducida, por lo que al eliminarlo y luego hacer una reinserci\u00f3n puede superponerse con los extremos, que nunca fueron eliminados, lo que activa una advertencia como la anterior, adem\u00e1s de dejar la vm en un estado defectuoso.\n\nCon eso, necesitamos dos cosas aqu\u00ed:\n\n1) Dejar de anular el seguimiento de prev/next para los casos de omisi\u00f3n. En su lugar, confiar en la verificaci\u00f3n de skip prev/next, donde sea necesario. De esa manera, en la ruta de desenrollado, ahora eliminamos correctamente ambos extremos.\n\n2) Deshacer la reducci\u00f3n del va de desmapeo, en la ruta de desenrollado. Con los dos extremos ahora eliminados, el va de desmapeo deber\u00eda expandirse de nuevo al tama\u00f1o original, antes de la reinserci\u00f3n.\n\nv2:\n - Actualizar la explicaci\u00f3n en el mensaje de commit, basada en una IGT real que activa este problema, en lugar de conjeturas.\n - Tambi\u00e9n deshacer la reducci\u00f3n del desmapeo, para el caso de omisi\u00f3n. Con los dos extremos ahora eliminados, el rango va de desmapeo original deber\u00eda expandirse de nuevo al rango original.\nv3:\n - Rastrear el inicio/rango antiguo por separado. vma_size/start() utiliza la informaci\u00f3n del va directamente.\n\n(seleccionado de la confirmaci\u00f3n aec6969f75afbf4e01fd5fb5850ed3e9c27043ac)"}], "lastModified": "2026-11-11T23:10:00.263", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5D6E7FC1-C351-46F7-8992-750C075964CD", "versionEndExcluding": "6.12.80", "versionStartIncluding": "6.8.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "ED39847A-3B46-4729-B7CA-B2C30B9FA8FE", "versionEndExcluding": "6.18.21", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4CA2E747-A9EC-4518-9AA2-B4247FC748B7", "versionEndExcluding": "6.19.11", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "41E47F32-BA80-4333-96FD-4D25082B0FDD"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}