CVE-2026-43237— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于amdgpu_gem_va_ioctl函数中围栏选择过早且引用管理不当，可能导致引用计数下溢和崩溃。
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 70773bef4e091ff6d2a91e3dfb4f29013eb81f1f< e9e477d3197f7d8955a042c0d7f53f78f13218ba |
affected |
70773bef4e091ff6d2a91e3dfb4f29013eb81f1f< 0399b8416ecf64ef86ad23401fe23eabdb07831a |
affected | ||
70773bef4e091ff6d2a91e3dfb4f29013eb81f1f< bd8150a1b3370a9f7761c5814202a3fe5a79f44f |
affected | ||
6.16 |
affected | ||
< 6.16 |
unaffected | ||
6.18.16≤ 6.18.* |
unaffected | ||
6.19.6≤ 6.19.* |
unaffected | ||
7.0≤ * |
unaffected |
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一、 漏洞 CVE-2026-43237 基础信息
漏洞信息
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Vulnerability Title
drm/amdgpu: Refactor amdgpu_gem_va_ioctl for Handling Last Fence Update and Timeline Management v4
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: Refactor amdgpu_gem_va_ioctl for Handling Last Fence Update and Timeline Management v4
This commit simplifies the amdgpu_gem_va_ioctl function, key updates
include:
- Moved the logic for managing the last update fence directly into
amdgpu_gem_va_update_vm.
- Introduced checks for the timeline point to enable conditional
replacement or addition of fences.
v2: Addressed review comments from Christian.
v3: Updated comments (Christian).
v4: The previous version selected the fence too early and did not manage its
reference correctly, which could lead to stale or freed fences being used.
This resulted in refcount underflows and could crash when updating GPU
timelines.
The fence is now chosen only after the VA mapping work is completed, and its
reference is taken safely. After exporting it to the VM timeline syncobj, the
driver always drops its local fence reference, ensuring balanced refcounting
and avoiding use-after-free on dma_fence.
Crash signature:
[ 205.828135] refcount_t: underflow; use-after-free.
[ 205.832963] WARNING: CPU: 30 PID: 7274 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110
...
[ 206.074014] Call Trace:
[ 206.076488] <TASK>
[ 206.078608] amdgpu_gem_va_ioctl+0x6ea/0x740 [amdgpu]
[ 206.084040] ? __pfx_amdgpu_gem_va_ioctl+0x10/0x10 [amdgpu]
[ 206.089994] drm_ioctl_kernel+0x86/0xe0 [drm]
[ 206.094415] drm_ioctl+0x26e/0x520 [drm]
[ 206.098424] ? __pfx_amdgpu_gem_va_ioctl+0x10/0x10 [amdgpu]
[ 206.104402] amdgpu_drm_ioctl+0x4b/0x80 [amdgpu]
[ 206.109387] __x64_sys_ioctl+0x96/0xe0
[ 206.113156] do_syscall_64+0x66/0x2d0
...
[ 206.553351] BUG: unable to handle page fault for address: ffffffffc0dfde90
...
[ 206.553378] RIP: 0010:dma_fence_signal_timestamp_locked+0x39/0xe0
...
[ 206.553405] Call Trace:
[ 206.553409] <IRQ>
[ 206.553415] ? __pfx_drm_sched_fence_free_rcu+0x10/0x10 [gpu_sched]
[ 206.553424] dma_fence_signal+0x30/0x60
[ 206.553427] drm_sched_job_done.isra.0+0x123/0x150 [gpu_sched]
[ 206.553434] dma_fence_signal_timestamp_locked+0x6e/0xe0
[ 206.553437] dma_fence_signal+0x30/0x60
[ 206.553441] amdgpu_fence_process+0xd8/0x150 [amdgpu]
[ 206.553854] sdma_v4_0_process_trap_irq+0x97/0xb0 [amdgpu]
[ 206.554353] edac_mce_amd(E) ee1004(E)
[ 206.554270] amdgpu_irq_dispatch+0x150/0x230 [amdgpu]
[ 206.554702] amdgpu_ih_process+0x6a/0x180 [amdgpu]
[ 206.555101] amdgpu_irq_handler+0x23/0x60 [amdgpu]
[ 206.555500] __handle_irq_event_percpu+0x4a/0x1c0
[ 206.555506] handle_irq_event+0x38/0x80
[ 206.555509] handle_edge_irq+0x92/0x1e0
[ 206.555513] __common_interrupt+0x3e/0xb0
[ 206.555519] common_interrupt+0x80/0xa0
[ 206.555525] </IRQ>
[ 206.555527] <TASK>
...
[ 206.555650] RIP: 0010:dma_fence_signal_timestamp_locked+0x39/0xe0
...
[ 206.555667] Kernel panic - not syncing: Fatal exception in interrupt
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于amdgpu_gem_va_ioctl函数中围栏选择过早且引用管理不当，可能导致引用计数下溢和崩溃。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-43237 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-43237 补丁与修复 (3)
同批安全公告 · Linux · 2026-05-06 · 共 224 条
| CVE-2026-43186 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43185 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43125 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43208 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43198 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43114 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43117 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43083 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43197 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43232 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43215 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43112 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43113 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43110 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43187 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43283 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43172 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43239 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43176 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43249 | 8.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 224 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-43237
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