CVE-2026-31479

What it actually does

This is a local Linux kernel vulnerability in the Intel Xe DRM graphics driver affecting virtual memory area handling during GPU VM bind and unwind operations. Under certain 3D workload and rebinding conditions, the driver can lose correct tracking of adjacent remapped ranges and later reinsert a shrunken virtual address range that overlaps ranges that were not removed. The result is corruption or inconsistency in the GPU VM bookkeeping, kernel warnings, and a bad driver state. Because the affected code runs in kernel context and is reachable by a local user able to interact with the Xe DRM device, successful exploitation could potentially lead to denial of service, memory corruption, or privilege-impacting behavior consistent with the assigned local privilege escalation severity.

Why it matters to the business

Systems using affected Linux kernels with the Intel Xe DRM driver may be exposed to a local attack path where an unprivileged or low-privileged user with access to GPU interfaces can destabilize the host or potentially gain elevated control. The most likely operational impact is workstation, developer, gaming, rendering, VDI, or GPU-enabled workload instability, including kernel warnings, graphics failures, application crashes, or full system crashes. The CVSS score of 7.8 reflects high potential impact, but current public exploitation signals are low: EPSS is approximately 0.0013, unchanged over 30 days, there is no known CISA KEV listing, no ransomware association, and no public exploit maturity reported.

How an attack unfolds

An attacker first needs local access to a vulnerable Linux system and permission to open the affected DRM/Xe GPU device interface. They then issue a crafted sequence of GPU VM bind, unbind, or rebind operations that creates a partially skipped remap case where compatible previous or next virtual memory areas are not rebound. If a later operation in the same bind vector fails and the driver enters the unwind path, the vulnerable code may remove and reinsert the wrong virtual address range because previous and next range tracking was lost and the unmap range was previously shrunk. This can leave overlapping virtual memory areas in the driver’s VM state, triggering kernel warnings such as vm_bind_ioctl_ops_unwind and xe_vm_bind_ioctl stack traces. Depending on kernel build, hardware, memory layout, and reachable follow-on corruption, this may be limited to a crash or may be exploitable for stronger kernel-level impact. No named threat actors or active exploitation campaigns are currently reported for this issue.

How to fix it

Upgrade to a Linux kernel build that includes the upstream fix for the Xe DRM VM bind unwind tracking issue, specifically the patch derived from commit aec6969f75afbf4e01fd5fb5850ed3e9c27043ac or the equivalent vendor backport. Because no exact fixed package versions were provided, use distribution security advisories and kernel changelogs to identify the first fixed kernel for each platform. Prioritize systems that enable the Intel Xe DRM driver and allow local users, containers, desktop sessions, GPU workloads, game translation layers, rendering jobs, or VDI users to access DRM render nodes. If immediate patching is not possible, reduce exposure by limiting local shell access, restricting membership in groups that grant GPU device access, tightening permissions on /dev/dri/* where operationally feasible, disabling or avoiding the affected Xe driver on nonessential systems, or booting into a kernel without the vulnerable driver path. Mitigations may affect graphics acceleration or GPU workloads and should be tested before broad deployment.

How to confirm the fix worked

Confirm remediation by checking that the running kernel package is at or above the vendor-fixed version or that the kernel source includes the equivalent of commit aec6969f75afbf4e01fd5fb5850ed3e9c27043ac. Verify whether the affected driver is present and loaded by checking for the xe module and DRM devices. Review distribution changelogs for references to drm/xe VM bind, remap prev/next tracking, vm_bind_ioctl_ops_unwind, or undoing unmap range shrinkage. After patching and rebooting, confirm the system is running the updated kernel with uname or package-manager inventory and that no old vulnerable kernel remains selected by default. For functional validation, run representative GPU/3D workloads and check kernel logs for recurrence of xe_vm_bind_ioctl or vm_bind_ioctl_ops_unwind warnings.

Typical attack path

1. Obtain local code execution on a Linux system using an affected kernel and Intel Xe DRM driver.
2. Confirm access to the GPU DRM device interface, typically through normal local user graphics or render-device permissions.
3. Create GPU virtual memory mappings using the Xe VM bind ioctl path.
4. Trigger a rebind scenario in the middle of an existing virtual memory area where one or both adjacent ends are compatible and skipped.
5. Force an error condition that causes the VM bind operation vector to enter the unwind path.
6. Abuse the incorrect previous/next tracking and shrunken unmap range restoration to create overlapping or inconsistent VM ranges.
7. Attempt to convert the resulting kernel driver state corruption into denial of service, information exposure, or privilege-impacting kernel behavior.

How to detect it

Look for evidence in kernel logs rather than network telemetry, because exploitation is local and occurs through GPU driver ioctls. Review journalctl, dmesg, syslog, kern.log, audit logs, EDR process telemetry, and crash dumps for Xe DRM warnings, kernel stack traces, GPU VM bind failures, or crashes near local GPU-heavy processes. Useful log sources include the systemd journal with kernel facility, /var/log/kern.log, /var/log/messages, /var/crash, kdump/vmcore records, auditd records for access to /dev/dri/renderD* or /dev/dri/card*, and EDR records showing local processes repeatedly opening DRM devices before kernel warnings. Search for vm_bind_ioctl_ops_unwind, xe_vm_bind_ioctl, drivers/gpu/drm/xe/xe_vm.c, and WARNING lines involving the xe kernel module. Presence of these strings is not proof of malicious exploitation because legitimate 3D workloads can trigger the bug, but repeated occurrences, correlation with unusual local processes, or activity by untrusted users should be investigated. There are no known remote network indicators, named attacker tooling, or ransomware-specific artifacts associated with this vulnerability at this time.

• WARNING: drivers/gpu/drm/xe/xe_vm.c
• vm_bind_ioctl_ops_unwind
• xe_vm_bind_ioctl
• [xe]
• drm/xe
• Comm: vkd3d_queue
• /dev/dri/renderD
• /dev/dri/card
• Kdump: loaded Not tainted
• Call Trace:
• RIP: 0010:vm_bind_ioctl_ops_unwind

What your security team should do

• Inventory Linux systems with Intel Xe graphics support, loaded xe DRM modules, or exposed /dev/dri render devices.
• Prioritize patching multi-user workstations, GPU-enabled developer systems, VDI hosts, rendering hosts, and shared Linux servers where local users can run GPU workloads.
• Track vendor advisories for exact fixed kernel package versions because the provided data does not include per-distribution fixed versions.
• Deploy the fixed kernel and reboot; kernel driver fixes are not fully effective until the vulnerable running kernel is replaced.
• Temporarily restrict local GPU device access on high-risk shared systems if patching must be delayed.
• Monitor kernel logs for xe DRM warnings and VM bind unwind stack traces as signs of attempted triggering or workload-induced instability.
• Treat unexplained kernel crashes or graphics-driver warnings on exposed multi-user systems as potential security events, not only reliability issues.
• Because EPSS is low, no KEV listing exists, and no public exploit is reported, prioritize based on local-user exposure and GPU access rather than internet-facing risk.