CVE-2026-45912— 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ext4文件系统在分裂extent过程中缓存extent，可能导致状态树中存在过时的extent条目。
可能的 ATT&CK 技术 1 AI
T1564.008 · Email Hiding Rules影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 107a7bd31ac003e42c0f966aa8e5b26947de6024< 8302b5b4aacdbb378f7b1216bb2ee782b5142415 |
affected |
107a7bd31ac003e42c0f966aa8e5b26947de6024< 692103feca376ae4298c92aa8828015d20f1d87b |
affected | ||
107a7bd31ac003e42c0f966aa8e5b26947de6024< 4c2d9dac4d328244f9365b0a1fa27ec802821820 |
affected | ||
107a7bd31ac003e42c0f966aa8e5b26947de6024< 93b2ebbbcb2e63cfc21a1946dfe91d3aa7952036 |
affected | ||
107a7bd31ac003e42c0f966aa8e5b26947de6024< 96007fd3c106aea773c1afae2d6f64cceb6da208 |
affected | ||
107a7bd31ac003e42c0f966aa8e5b26947de6024< 5b1f4290453314e11cd8e15c7baa8a9b76c19b23 |
affected | ||
107a7bd31ac003e42c0f966aa8e5b26947de6024< 9a2b95cdaf07785e2739199037bd9c0863ccc1be |
affected | ||
107a7bd31ac003e42c0f966aa8e5b26947de6024< 8b4b19a2f96348d70bfa306ef7d4a13b0bcbea79 |
affected | ||
| … +10 条更多 | |||
获取后续新漏洞提醒
登录后订阅
一、 漏洞 CVE-2026-45912 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
查看神龙十问 ↗
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
ext4: don't cache extent during splitting extent
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ext4: don't cache extent during splitting extent
Caching extents during the splitting process is risky, as it may result
in stale extents remaining in the status tree. Moreover, in most cases,
the corresponding extent block entries are likely already cached before
the split happens, making caching here not particularly useful.
Assume we have an unwritten extent, and then DIO writes the first half.
[UUUUUUUUUUUUUUUU] on-disk extent U: unwritten extent
[UUUUUUUUUUUUUUUU] extent status tree
|<- ->| ----> dio write this range
First, when ext4_split_extent_at() splits this extent, it truncates the
existing extent and then inserts a new one. During this process, this
extent status entry may be shrunk, and calls to ext4_find_extent() and
ext4_cache_extents() may occur, which could potentially insert the
truncated range as a hole into the extent status tree. After the split
is completed, this hole is not replaced with the correct status.
[UUUUUUU|UUUUUUUU] on-disk extent U: unwritten extent
[UUUUUUU|HHHHHHHH] extent status tree H: hole
Then, the outer calling functions will not correct this remaining hole
extent either. Finally, if we perform a delayed buffer write on this
latter part, it will re-insert the delayed extent and cause an error in
space accounting.
In adition, if the unwritten extent cache is not shrunk during the
splitting, ext4_cache_extents() also conflicts with existing extents
when caching extents. In the future, we will add checks when caching
extents, which will trigger a warning. Therefore, Do not cache extents
that are being split.
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ext4文件系统在分裂extent过程中缓存extent，可能导致状态树中存在过时的extent条目。
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-2026-45912 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
未找到公开 POC。
登录以生成 AI POC三、漏洞 CVE-2026-45912 的情报信息
请登录查看更多情报信息。
CVE-2026-45912 补丁与修复 (7)
同批安全公告 · Linux · 2026-05-27 · 共 275 条
| CVE-2026-46039 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45898 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45988 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45972 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46043 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45945 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46056 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45843 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71311 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46037 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46099 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46010 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46076 | 7.9 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45909 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45862 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45956 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45910 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45942 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45894 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45933 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 275 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-45912
暂无评论