CVE-2026-31686— 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kasan_free_pxd函数假设页表始终按struct page对齐，但某些架构不满足此条件，可能导致双重释放。
可能的 ATT&CK 技术 1 AI
T1203 · Exploitation for Client Execution影响版本矩阵 20
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 0207df4fa1a869281ddbf72db6203dbf036b3e1a< 7d7b2d5c107a1f6302cf0006d859985e7c3ddd1c |
affected |
0207df4fa1a869281ddbf72db6203dbf036b3e1a< 3298bdf5a878ded06351eb293856fa84e050029e |
affected | ||
0207df4fa1a869281ddbf72db6203dbf036b3e1a< 2277246ea265cdca64ce6fdea4b26cd6ff0ec4db |
affected | ||
0207df4fa1a869281ddbf72db6203dbf036b3e1a< cec74b2ab7dff866b1d77eaa545b9e8fd14a1f87 |
affected | ||
0207df4fa1a869281ddbf72db6203dbf036b3e1a< a05f77cb227c39c5069aea6f12762a29d1e6c103 |
affected | ||
0207df4fa1a869281ddbf72db6203dbf036b3e1a< f6204f7ff6aff62ce6242a76982c5ba3a9ded707 |
affected | ||
0207df4fa1a869281ddbf72db6203dbf036b3e1a< 85d98614e089a67dc6faa8ca766fe10a639f82b4 |
affected | ||
0207df4fa1a869281ddbf72db6203dbf036b3e1a< b38237a2ea9c6c19836eee2c57037e1f9f103576 |
affected | ||
| … +12 条更多 | |||
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一、 漏洞 CVE-2026-31686 基础信息
漏洞信息
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Vulnerability Title
mm/kasan: fix double free for kasan pXds
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mm/kasan: fix double free for kasan pXds
kasan_free_pxd() assumes the page table is always struct page aligned.
But that's not always the case for all architectures. E.g. In case of
powerpc with 64K pagesize, PUD table (of size 4096) comes from slab cache
named pgtable-2^9. Hence instead of page_to_virt(pxd_page()) let's just
directly pass the start of the pxd table which is passed as the 1st
argument.
This fixes the below double free kasan issue seen with PMEM:
radix-mmu: Mapped 0x0000047d10000000-0x0000047f90000000 with 2.00 MiB pages
==================================================================
BUG: KASAN: double-free in kasan_remove_zero_shadow+0x9c4/0xa20
Free of addr c0000003c38e0000 by task ndctl/2164
CPU: 34 UID: 0 PID: 2164 Comm: ndctl Not tainted 6.19.0-rc1-00048-gea1013c15392 #157 VOLUNTARY
Hardware name: IBM,9080-HEX POWER10 (architected) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_012) hv:phyp pSeries
Call Trace:
dump_stack_lvl+0x88/0xc4 (unreliable)
print_report+0x214/0x63c
kasan_report_invalid_free+0xe4/0x110
check_slab_allocation+0x100/0x150
kmem_cache_free+0x128/0x6e0
kasan_remove_zero_shadow+0x9c4/0xa20
memunmap_pages+0x2b8/0x5c0
devm_action_release+0x54/0x70
release_nodes+0xc8/0x1a0
devres_release_all+0xe0/0x140
device_unbind_cleanup+0x30/0x120
device_release_driver_internal+0x3e4/0x450
unbind_store+0xfc/0x110
drv_attr_store+0x78/0xb0
sysfs_kf_write+0x114/0x140
kernfs_fop_write_iter+0x264/0x3f0
vfs_write+0x3bc/0x7d0
ksys_write+0xa4/0x190
system_call_exception+0x190/0x480
system_call_vectored_common+0x15c/0x2ec
---- interrupt: 3000 at 0x7fff93b3d3f4
NIP: 00007fff93b3d3f4 LR: 00007fff93b3d3f4 CTR: 0000000000000000
REGS: c0000003f1b07e80 TRAP: 3000 Not tainted (6.19.0-rc1-00048-gea1013c15392)
MSR: 800000000280f033 <SF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE> CR: 48888208 XER: 00000000
<...>
NIP [00007fff93b3d3f4] 0x7fff93b3d3f4
LR [00007fff93b3d3f4] 0x7fff93b3d3f4
---- interrupt: 3000
The buggy address belongs to the object at c0000003c38e0000
which belongs to the cache pgtable-2^9 of size 4096
The buggy address is located 0 bytes inside of
4096-byte region [c0000003c38e0000, c0000003c38e1000)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3c38c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:c0000003bfd63e01
flags: 0x63ffff800000040(head|node=6|zone=0|lastcpupid=0x7ffff)
page_type: f5(slab)
raw: 063ffff800000040 c000000140058980 5deadbeef0000122 0000000000000000
raw: 0000000000000000 0000000080200020 00000000f5000000 c0000003bfd63e01
head: 063ffff800000040 c000000140058980 5deadbeef0000122 0000000000000000
head: 0000000000000000 0000000080200020 00000000f5000000 c0000003bfd63e01
head: 063ffff800000002 c00c000000f0e301 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
[ 138.953636] [ T2164] Memory state around the buggy address:
[ 138.953643] [ T2164] c0000003c38dff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 138.953652] [ T2164] c0000003c38dff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 138.953661] [ T2164] >c0000003c38e0000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 138.953669] [ T2164] ^
[ 138.953675] [ T2164] c0000003c38e0080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 138.953684] [ T2164] c0000003c38e0100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 138.953692] [ T2164] ==================================================================
[ 138.953701] [ T2164] Disabling lock debugging due to kernel taint
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kasan_free_pxd函数假设页表始终按struct page对齐，但某些架构不满足此条件，可能导致双重释放。
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-2026-31686 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-31686 补丁与修复 (9)
同批安全公告 · Linux · 2026-04-27 · 共 5 条
| CVE-2026-31687 | Linux kernel 安全漏洞 | |
| CVE-2026-31689 | Linux kernel 安全漏洞 | |
| CVE-2026-31690 | Linux kernel 安全漏洞 | |
| CVE-2026-31691 | Linux kernel 安全漏洞 |
IV. Related Vulnerabilities
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