CVE-2026-52976 (GCVE-0-2026-52976)
Vulnerability from cvelistv5
Published
2026-06-24 16:28
Modified
2026-08-10 12:05
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/xe: Fix error cleanup in xe_exec_queue_create_ioctl() Two error handling issues exist in xe_exec_queue_create_ioctl(): 1. When xe_hw_engine_group_add_exec_queue() fails, the error path jumps to put_exec_queue which skips xe_exec_queue_kill(). If the VM is in preempt fence mode, xe_vm_add_compute_exec_queue() has already added the queue to the VM's compute exec queue list. Skipping the kill leaves the queue on that list, leading to a dangling pointer after the queue is freed. 2. When xa_alloc() fails after xe_hw_engine_group_add_exec_queue() has succeeded, the error path does not call xe_hw_engine_group_del_exec_queue() to remove the queue from the hw engine group list. The queue is then freed while still linked into the hw engine group, causing a use-after-free. Fix both by: - Changing the xe_hw_engine_group_add_exec_queue() failure path to jump to kill_exec_queue so that xe_exec_queue_kill() properly removes the queue from the VM's compute list. - Adding a del_hw_engine_group label before kill_exec_queue for the xa_alloc() failure path, which removes the queue from the hw engine group before proceeding with the rest of the cleanup. (cherry picked from commit 37c831f401746a45d510b312b0ed7a77b1e06ec8)
References
Impacted products
Vendor Product Version
Linux Linux Version: 7970cb36966c9b9183255dc097ae0446300eebcf
Version: 7970cb36966c9b9183255dc097ae0446300eebcf
Version: 7970cb36966c9b9183255dc097ae0446300eebcf
Version: 7970cb36966c9b9183255dc097ae0446300eebcf
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              "value": "AV:L - The vulnerable code is reached through the local DRM Xe `XE_EXEC_QUEUE_CREATE` ioctl on a GPU device/render node. It is not reachable by remote network traffic or adjacent/physical input.\nAC:L - The attacker controls the ioctl sequence and can drive the relevant error cleanup paths through local resource pressure or interruptible operations. No uncontrollable race or rare victim state is required for the dangling queue pointer to be created and later exercised.\nPR:L - The ioctl is registered with `DRM_RENDER_ALLOW`, with no root, DRM master, or authentication requirement, so an unprivileged local GPU client that can open the render node can reach it. This is basic local user access, not real administrator privilege.\nUI:N - Exploitation only requires the attacker to issue ioctls from their own process. No victim user action is needed.\nS:U - The bug is within the kernel DRM Xe driver and impacts kernel resources under the same OS security authority. It does not cross a VM, hypervisor, or IOMMU security boundary by itself.\nC:H - The cleanup bug leaves a freed `struct xe_exec_queue` linked into VM or hardware-engine-group lists, creating a use-after-free. Under the required kernel scoring guidance, UAF memory corruption is treated as enabling high confidentiality impact.\nI:H - The stale list entry is later dereferenced through queue fields and operation pointers, making this kernel heap use-after-free potentially exploitable for control-flow or memory corruption. Under the required guidance, UAF implies high integrity impact.\nA:H - The dangling pointer can be reached by later VM or engine-group list traversal and can cause kernel oops, panic, or hang. A local attacker can trigger the condition repeatedly, so availability impact is high."
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