CVE-2026-74482— 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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于mm/huge_memory.c中的__folio_split()函数在拆分后释放folio时未正确持有inode引用，仍对mapping进行解引用，导致释放后重用，可能引发系统崩溃。
可能的 ATT&CK 技术 1 AI
T1211 · Exploitation for Stealth影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | baa355fd331424526e742d41d9b90d5f9d10f716< bc2f5eabaaf60ec18da70b619a8fba1bfb7dea3a |
affected |
baa355fd331424526e742d41d9b90d5f9d10f716< f87c08060818ebb19bafed37c38244538da25097 |
affected | ||
baa355fd331424526e742d41d9b90d5f9d10f716< 6f5c272d71845a669e4c8ee5c72b376e29a0e6e5 |
affected | ||
baa355fd331424526e742d41d9b90d5f9d10f716< be106f7855f03d3128ed0ce70ba74b484a90b473 |
affected | ||
baa355fd331424526e742d41d9b90d5f9d10f716< e3dd774dbfd0b5bc2dbd0995221751b1234f8205 |
affected | ||
baa355fd331424526e742d41d9b90d5f9d10f716< 10065fb891651d9541e7a5a2db84c1e656ece4f9 |
affected | ||
baa355fd331424526e742d41d9b90d5f9d10f716< d640efe94d86d3be893d4c19220362546a637e90 |
affected | ||
baa355fd331424526e742d41d9b90d5f9d10f716< e923bd21058ea02fd0dcd3549d151d143fd036e5 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-74482 基础信息
漏洞信息
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Vulnerability Title
mm/huge_memory: unlock i_mmap_rwsem before releasing after-split folios
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mm/huge_memory: unlock i_mmap_rwsem before releasing after-split folios
__folio_split() keeps dereferencing the mapping after the split:
shmem_uncharge(mapping->host) and remap_page() while the folios are still
frozen/locked, and i_mmap_unlock_read(mapping) at the very end, after the
after-split folios have been unlocked and freed.
Nothing holds an inode reference across that. The split relies on @folio
-- which the beyond-EOF drop loop never removes, as it starts at
folio_next(folio) -- staying locked and in the page cache to hold off
eviction. But the unlock loop unlocks @folio before i_mmap_unlock_read()
runs. If the caller's @lock_at is a tail beyond EOF, as memory_failure()
passes when splitting a poisoned tail of a shmem THP that reaches past
i_size during truncation, it too is gone from the page cache; so once
@folio is unlocked no locked, in-cache folio pins the inode, and a
concurrent final iput() can evict and RCU-free it before
i_mmap_unlock_read() touches i_mmap_rwsem:
BUG: KASAN: slab-use-after-free in __up_read+0x634/0x790
i_mmap_unlock_read include/linux/fs.h:537 [inline]
__folio_split+0x732/0x1640 mm/huge_memory.c:4100
try_to_split_thp_page+0xab/0x390 mm/memory-failure.c:1675
memory_failure+0x1394/0x26e0 mm/memory-failure.c:2470
Freed by task 4601:
shmem_free_in_core_inode+0x54/0xb0 mm/shmem.c:5177
evict+0x57f/0xac0 fs/inode.c:870
Do every mapping dereference while @folio still pins the inode: drop
i_mmap_rwsem right after remap_page(), before the loop that unlocks and
frees the after-split folios, and clear @mapping so the exit path does not
unlock it again. shmem_uncharge() and remap_page() already run before
that point, so after this nothing past the unlock loop touches the inode
or the mapping.
This is now a rule the split depends on, alongside keeping @folio frozen
until the page cache is updated: no inode or mapping dereference once the
after-split folios start being unlocked.
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于mm/huge_memory.c中的__folio_split()函数在拆分后释放folio时未正确持有inode引用，仍对mapping进行解引用，导致释放后重用，可能引发系统崩溃。
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-2026-74482 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-74482 补丁与修复 (8)
同批安全公告 · Linux · 2026-08-15 · 共 844 条
| CVE-2026-74280 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74279 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74475 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72421 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74309 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72407 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72408 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72493 | 9.9 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72046 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74376 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72217 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72299 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74384 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72210 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72211 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72209 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72317 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74267 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72206 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72207 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 844 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-74482
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