CVE-2026-43065— 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文件系统在重新挂载为nodiscard后未排空待处理的丢弃工作。
可能的 ATT&CK 技术 1 AI
T1499.001 · OS Exhaustion Flood影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 55cdd0af2bc5ffc92a2deb745627755aecd5db33< e96c2354b170aaa53300c8e8fd59e41b133160f7 |
affected |
55cdd0af2bc5ffc92a2deb745627755aecd5db33< c360e9d0def4f4ae03254a67c683103908555b75 |
affected | ||
55cdd0af2bc5ffc92a2deb745627755aecd5db33< 1c82f863f090ab899085bdfade073313384b514b |
affected | ||
55cdd0af2bc5ffc92a2deb745627755aecd5db33< 9b4d9dda6a71ad3425c8109d27c4c6bfb9da97b8 |
affected | ||
55cdd0af2bc5ffc92a2deb745627755aecd5db33< 812b6a7cd3e7f3a3e8a24db85bc6313c26cb1098 |
affected | ||
55cdd0af2bc5ffc92a2deb745627755aecd5db33< b4737e26d4688b8aea88ad6ea4dbfeb6e78b0327 |
affected | ||
55cdd0af2bc5ffc92a2deb745627755aecd5db33< 9ee29d20aab228adfb02ca93f87fb53c56c2f3af |
affected | ||
5.15 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2026-43065 基础信息
漏洞信息
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Vulnerability Title
ext4: always drain queued discard work in ext4_mb_release()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ext4: always drain queued discard work in ext4_mb_release()
While reviewing recent ext4 patch[1], Sashiko raised the following
concern[2]:
> If the filesystem is initially mounted with the discard option,
> deleting files will populate sbi->s_discard_list and queue
> s_discard_work. If it is then remounted with nodiscard, the
> EXT4_MOUNT_DISCARD flag is cleared, but the pending s_discard_work is
> neither cancelled nor flushed.
[1] https://lore.kernel.org/r/20260319094545.19291-1-qiang.zhang@linux.dev/
[2] https://sashiko.dev/#/patchset/20260319094545.19291-1-qiang.zhang%40linux.dev
The concern was valid, but it had nothing to do with the patch[1].
One of the problems with Sashiko in its current (early) form is that
it will detect pre-existing issues and report it as a problem with the
patch that it is reviewing.
In practice, it would be hard to hit deliberately (unless you are a
malicious syzkaller fuzzer), since it would involve mounting the file
system with -o discard, and then deleting a large number of files,
remounting the file system with -o nodiscard, and then immediately
unmounting the file system before the queued discard work has a change
to drain on its own.
Fix it because it's a real bug, and to avoid Sashiko from raising this
concern when analyzing future patches to mballoc.c.
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文件系统在重新挂载为nodiscard后未排空待处理的丢弃工作。
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-2026-43065 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-43065 补丁与修复 (7)
同批安全公告 · Linux · 2026-05-05 · 共 15 条
| CVE-2026-43067 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43071 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43070 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43063 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43060 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43062 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43073 | Linux kernel 安全漏洞 | |
| CVE-2026-43072 | Linux kernel 安全漏洞 | |
| CVE-2026-43069 | Linux kernel 安全漏洞 | |
| CVE-2026-43068 | Linux kernel 安全漏洞 | |
| CVE-2026-43066 | Linux kernel 安全漏洞 | |
| CVE-2026-43064 | Linux kernel 安全漏洞 | |
| CVE-2026-43061 | Linux kernel 安全漏洞 | |
| CVE-2026-43059 | Linux kernel 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-43065
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