CVE-2026-68264

Received Received - Intake

Buffer Overflow in Linux Kernel DRM/XE Driver

Publication date: 2026-08-10

Last updated on: 2026-08-17

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: drm/xe/pt: Reset current_op in xe_pt_update_ops_init() xe_pt_update_ops_init() fails to reset current_op to 0. On the vm_bind path, ops_execute() calls xe_pt_update_ops_prepare() inside the xe_validation_guard() / drm_exec_until_all_locked() loop. When that loop retries due to lock contention or OOM eviction (drm_exec_retry_on_contention() / xe_validation_retry_on_oom()), xe_pt_update_ops_prepare() runs again on the same vops, and each call to bind_op_prepare() increments current_op without resetting it. After N retries current_op exceeds the array size allocated by xe_vma_ops_alloc(), causing an out-of-bounds write into SLUB-poisoned memory and a subsequent UAF crash in xe_migrate_update_pgtables_cpu() when reading the corrupted pt_op->bind. Also reset needs_svm_lock and needs_invalidation which are derived in the same prepare pass and would otherwise cause wrong migrate ops selection and redundant TLB invalidation on retry. Fix this by resetting current_op, needs_svm_lock and needs_invalidation in xe_pt_update_ops_init(). v2 (Matt): - Add details in commit message. - Add Fixes tag and Cc to stable@vger.kernel.org (cherry picked from commit 046045543e530605c441063535e7dca0075369a6)

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-10

Last Modified

2026-08-17

Generated

2026-08-30

AI Q&A

2026-08-10

EPSS Evaluated

2026-08-29

NVD

CVE-2026-68264

EUVD

EUVD-2026-55365

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This is a Linux kernel vulnerability in the DRM/XE driver where xe_pt_update_ops_init() fails to reset current_op to 0. During the vm_bind path, repeated retries due to lock contention or OOM eviction cause current_op to increment without reset, leading to an out-of-bounds write into SLUB-poisoned memory. This results in a use-after-free (UAF) crash when xe_migrate_update_pgtables_cpu() reads corrupted pt_op->bind.

Detection Guidance

This vulnerability is specific to the Linux kernel's DRM/Xe driver and may not have direct network detection methods. Monitor kernel logs for crashes or errors related to xe_migrate_update_pgtables_cpu or SLUB poisoning. Check for out-of-bounds write events in kernel logs.

Impact Analysis

This vulnerability can cause system crashes due to memory corruption, leading to potential denial-of-service conditions. If exploited, it may allow attackers to execute arbitrary code with kernel privileges, compromising system integrity and confidentiality.

Compliance Impact

This vulnerability is a memory corruption issue in the Linux kernel's DRM/XE subsystem that could lead to a use-after-free (UAF) crash. While it does not directly impact compliance with GDPR or HIPAA, such kernel vulnerabilities may indirectly affect compliance by compromising system stability, data integrity, or security controls that rely on stable kernel operations.

Mitigation Strategies

Apply the kernel patch that resets current_op, needs_svm_lock, and needs_invalidation in xe_pt_update_ops_init(). Update to a Linux kernel version that includes the fix. If immediate patching is not possible, disable the affected DRM/Xe driver module if not required.

Hi! I’m here to help you understand CVE-2026-68264. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70