{"id":"CVE-2026-68264","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-68264","summary":"drm/xe/pt: Reset current_op in xe_pt_update_ops_init()","details":"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_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)","published":"2026-08-10T12:01:38.686Z","modified":"2026-08-14T04:03:56.479308500Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.12.103"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/157b1e3384d7d37f59c0c2b2ff2af8f557db1daa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6384271ac1ac0099198d15df79212a19ebdb929d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/90e4fd331b980259c40118d05b89b0ec514e7c48"},{"type":"WEB","url":"https://git.kernel.org/stable/c/be5c39730ab8f1dfe59983bf7d8e3705541d1fee"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68264.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68264"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-14T04:03:56.479308500Z"}}