{"id":"CVE-2026-68264","title":"drm/xe/pt: Reset current_op in xe_pt_update_ops_init()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/pt: Reset current_op in xe_pt_update_ops_init()\n\nxe_pt_update_ops_init() fails to reset current_op to 0. On the\nvm_bind path, ops_execute() calls xe_pt_update_op…","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","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 < be5c39730ab8f1dfe59983bf7d8e3705541d1fee","Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 < 157b1e3384d7d37f59c0c2b2ff2af8f557db1daa","Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 < 90e4fd331b980259c40118d05b89b0ec514e7c48","Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 < 6384271ac1ac0099198d15df79212a19ebdb929d","Linux 6.12"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:46:21.749060Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:05.337Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68264","references":[{"url":"https://git.kernel.org/stable/c/be5c39730ab8f1dfe59983bf7d8e3705541d1fee"},{"url":"https://git.kernel.org/stable/c/157b1e3384d7d37f59c0c2b2ff2af8f557db1daa"},{"url":"https://git.kernel.org/stable/c/90e4fd331b980259c40118d05b89b0ec514e7c48"},{"url":"https://git.kernel.org/stable/c/6384271ac1ac0099198d15df79212a19ebdb929d"}],"tags":["cve.org"],"epss":0.00138,"epssPercentile":0.02846,"ingestedAt":"2026-10-16T17:24:46.851Z","slug":"CVE-2026-68264","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/pt: Reset current_op in xe_pt_update_ops_init()\n\nxe_pt_update_ops_init() fails to reset current_op to 0. On the\nvm_bind path, ops_execute() calls xe_pt_update_ops_prepare() inside\nthe xe_validation_guard() / drm_exec_until_all_locked() loop. When\nthat loop retries due to lock contention or OOM eviction\n(drm_exec_retry_on_contention() / xe_validation_retry_on_oom()),\nxe_pt_update_ops_prepare() runs again on the same vops, and each\ncall to bind_op_prepare() increments current_op without resetting it.\n\nAfter N retries current_op exceeds the array size allocated by\nxe_vma_ops_alloc(), causing an out-of-bounds write into\nSLUB-poisoned memory and a subsequent UAF crash in\nxe_migrate_update_pgtables_cpu() when reading the corrupted pt_op->bind.\n\nAlso reset needs_svm_lock and needs_invalidation which are derived in\nthe same prepare pass and would otherwise cause wrong migrate ops\nselection and redundant TLB invalidation on retry.\n\nFix this by resetting current_op, needs_svm_lock and needs_invalidation\nin xe_pt_update_ops_init().\n\nv2 (Matt):\n   - Add details in commit message.\n   - Add Fixes tag and Cc to stable@vger.kernel.org\n\n(cherry picked from commit 046045543e530605c441063535e7dca0075369a6)\n\n## Affected\n\n- `Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 < be5c39730ab8f1dfe59983bf7d8e3705541d1fee`\n- `Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 < 157b1e3384d7d37f59c0c2b2ff2af8f557db1daa`\n- `Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 < 90e4fd331b980259c40118d05b89b0ec514e7c48`\n- `Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 < 6384271ac1ac0099198d15df79212a19ebdb929d`\n- `Linux 6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}