CVE-2026-99090— drm/amdgpu: serialize vblank counter reads against GPU reset

Quick assessment

Affected

Linux Linux

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： drm/amdgpu：在 GPU 复位期间对垂直消隐（vblank）计数器的读取进行序列化垂直消隐计数器的回调函数在读取显示寄存器以及扫描输出（scanout）位置时，并未持有信号量。在 GPU 恢复过程中，显示提交（display commit）任务可能会调用该回调，而此时复位流程已持有该信号量以执行写操作。随后的硬件访问会触发中的断言，并在启用 lockdep 时设置标记。修复方案是：在访问硬件之前，尝试以读模式获取复位信号量，并在读取计数器及扫描输出位

AI Predicted 5.5 Difficulty: Hard Updated Oct 26, 2026

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Updated Oct 26, 2026

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Vulnerability Information

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Vulnerability Title

drm/amdgpu: serialize vblank counter reads against GPU reset

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: serialize vblank counter reads against GPU reset The vblank counter callback reads display registers and scanout position without holding reset_domain->sem. During GPU recovery, display commit work can call the callback while reset owns the semaphore for writing. The hardware access then triggers the lockdep_assert_held() in amdgpu_device_skip_hw_access() and sets TAINT_WARN when lockdep is enabled. Try to acquire the reset semaphore for reading before accessing the hardware, and hold it across the counter and scanout-position reads. If reset is already in progress, return DRM's cached software vblank count instead. This avoids blocking behind reset and avoids accessing display hardware while it is being reset. The cached count is less accurate than the hardware count, but is used only when reset prevents a safe hardware read. This addresses the reset-time warning from this vblank path; it does not suppress or fix unrelated lockdep warnings. (cherry picked from commit 51a4359f7431a4be5e42803c8bdaf7e0e5be2934)

Source: CVE Program / CVE List V5

CVSS Information

N/A

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linux	Linux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 037796d9ca1da97978deaefd88ca5649f6cb69f5	-
Linux	Linux	6.6.160 ~ 6.6.*	-

II. Public POCs for CVE-2026-99090

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-99090

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Patches & Fixes for CVE-2026-99090 (5)

https://www.cve.org/CVERecord?id=CVE-2026-99090

Same Patch Batch · Linux · 2026-10-26 · 12 CVEs total

CVE-2026-99099		x86/CPU/AMD: Fix AMD TLBI Erratum #1718
CVE-2026-99097		tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()
CVE-2026-99098		dm-integrity: fix buffer overflow in inline mode with large tag size
CVE-2026-99095		drm/vc4: drain the hangcheck timer and works on V3D unbind
CVE-2026-99096		io_uring/register: don't exempt disabled rings from task restrictions
CVE-2026-99094		Bluetooth: btintel_pcie: fix TX descriptor bounds check
CVE-2026-99093		mm: don't schedule deferred kernel page table freeing while booting
CVE-2026-99092		riscv: patch: fix handling of bpf-jit execmem addresses
CVE-2026-99091		Bluetooth: MGMT: Fix status of pending commands flushed on power off
CVE-2026-99089		ASoC: samsung: i2s: enable op_clk in probe to balance runtime PM
CVE-2026-99088		net: openvswitch: validate transport header presence in set_ipv6_addr

IV. Related Vulnerabilities

Same product: Linux

Same vendor: Linux