CVE-2026-31765— 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drm amdgpu驱动中AMDGPU_VA_RESERVED_TRAP_SIZE与KFD_CWSR_TBA_TMA_SIZE在64K页面系统上不匹配，可能导致内核崩溃。
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 34a1de0f79352086884553f78db271f957a98583< 6b2614a0ff05a2d2836311425091c8feca6f0c21 |
affected |
34a1de0f79352086884553f78db271f957a98583< 77c918eaa4c916751769242567407f61c6af142a |
affected | ||
34a1de0f79352086884553f78db271f957a98583< d3508cf822c4d96d3e492210314f8f6f2da7df58 |
affected | ||
34a1de0f79352086884553f78db271f957a98583< 4487571ef17a30d274600b3bd6965f497a881299 |
affected | ||
6.9 |
affected | ||
< 6.9 |
unaffected | ||
6.12.81≤ 6.12.* |
unaffected | ||
6.18.22≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-31765 基础信息
漏洞信息
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Vulnerability Title
drm/amdgpu: Change AMDGPU_VA_RESERVED_TRAP_SIZE to 64KB
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: Change AMDGPU_VA_RESERVED_TRAP_SIZE to 64KB
Currently, AMDGPU_VA_RESERVED_TRAP_SIZE is hardcoded to 8KB, while
KFD_CWSR_TBA_TMA_SIZE is defined as 2 * PAGE_SIZE. On systems with
4K pages, both values match (8KB), so allocation and reserved space
are consistent.
However, on 64K page-size systems, KFD_CWSR_TBA_TMA_SIZE becomes 128KB,
while the reserved trap area remains 8KB. This mismatch causes the
kernel to crash when running rocminfo or rccl unit tests.
Kernel attempted to read user page (2) - exploit attempt? (uid: 1001)
BUG: Kernel NULL pointer dereference on read at 0x00000002
Faulting instruction address: 0xc0000000002c8a64
Oops: Kernel access of bad area, sig: 11 [#1]
LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries
CPU: 34 UID: 1001 PID: 9379 Comm: rocminfo Tainted: G E
6.19.0-rc4-amdgpu-00320-gf23176405700 #56 VOLUNTARY
Tainted: [E]=UNSIGNED_MODULE
Hardware name: IBM,9105-42A POWER10 (architected) 0x800200 0xf000006
of:IBM,FW1060.30 (ML1060_896) hv:phyp pSeries
NIP: c0000000002c8a64 LR: c00000000125dbc8 CTR: c00000000125e730
REGS: c0000001e0957580 TRAP: 0300 Tainted: G E
MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE> CR: 24008268
XER: 00000036
CFAR: c00000000125dbc4 DAR: 0000000000000002 DSISR: 40000000
IRQMASK: 1
GPR00: c00000000125d908 c0000001e0957820 c0000000016e8100
c00000013d814540
GPR04: 0000000000000002 c00000013d814550 0000000000000045
0000000000000000
GPR08: c00000013444d000 c00000013d814538 c00000013d814538
0000000084002268
GPR12: c00000000125e730 c000007e2ffd5f00 ffffffffffffffff
0000000000020000
GPR16: 0000000000000000 0000000000000002 c00000015f653000
0000000000000000
GPR20: c000000138662400 c00000013d814540 0000000000000000
c00000013d814500
GPR24: 0000000000000000 0000000000000002 c0000001e0957888
c0000001e0957878
GPR28: c00000013d814548 0000000000000000 c00000013d814540
c0000001e0957888
NIP [c0000000002c8a64] __mutex_add_waiter+0x24/0xc0
LR [c00000000125dbc8] __mutex_lock.constprop.0+0x318/0xd00
Call Trace:
0xc0000001e0957890 (unreliable)
__mutex_lock.constprop.0+0x58/0xd00
amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x6fc/0xb60 [amdgpu]
kfd_process_alloc_gpuvm+0x54/0x1f0 [amdgpu]
kfd_process_device_init_cwsr_dgpu+0xa4/0x1a0 [amdgpu]
kfd_process_device_init_vm+0xd8/0x2e0 [amdgpu]
kfd_ioctl_acquire_vm+0xd0/0x130 [amdgpu]
kfd_ioctl+0x514/0x670 [amdgpu]
sys_ioctl+0x134/0x180
system_call_exception+0x114/0x300
system_call_vectored_common+0x15c/0x2ec
This patch changes AMDGPU_VA_RESERVED_TRAP_SIZE to 64 KB and
KFD_CWSR_TBA_TMA_SIZE to the AMD GPU page size. This means we reserve
64 KB for the trap in the address space, but only allocate 8 KB within
it. With this approach, the allocation size never exceeds the reserved
area.
(cherry picked from commit 31b8de5e55666f26ea7ece5f412b83eab3f56dbb)
来源: CVE Program / CVE List V5
CVSS Information
N/A
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drm amdgpu驱动中AMDGPU_VA_RESERVED_TRAP_SIZE与KFD_CWSR_TBA_TMA_SIZE在64K页面系统上不匹配，可能导致内核崩溃。
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-2026-31765 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-31765 补丁与修复 (4)
同批安全公告 · Linux · 2026-05-01 · 共 146 条
| CVE-2026-43011 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43037 | 9.8 CRITICAL | Linux kernel 缓冲区错误漏洞 |
| CVE-2026-31705 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43038 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43039 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31718 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43018 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31773 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31739 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31735 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31717 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43048 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31709 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31706 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31712 | 8.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31771 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31779 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43051 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31708 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31695 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 146 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-31765
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