CVE-2023-53813— 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_mb_use_preallocated未正确处理rbtree遍历，可能导致预分配空间重叠。
可能的 ATT&CK 技术 1 AI
T1496 · Resource Hijacking
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一、 漏洞 CVE-2023-53813 基础信息
漏洞信息
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Vulnerability Title
ext4: fix rbtree traversal bug in ext4_mb_use_preallocated
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix rbtree traversal bug in ext4_mb_use_preallocated
During allocations, while looking for preallocations(PA) in the per
inode rbtree, we can't do a direct traversal of the tree because
ext4_mb_discard_group_preallocation() can paralelly mark the pa deleted
and that can cause direct traversal to skip some entries. This was
leading to a BUG_ON() being hit [1] when we missed a PA that could satisfy
our request and ultimately tried to create a new PA that would overlap
with the missed one.
To makes sure we handle that case while still keeping the performance of
the rbtree, we make use of the fact that the only pa that could possibly
overlap the original goal start is the one that satisfies the below
conditions:
1. It must have it's logical start immediately to the left of
(ie less than) original logical start.
2. It must not be deleted
To find this pa we use the following traversal method:
1. Descend into the rbtree normally to find the immediate neighboring
PA. Here we keep descending irrespective of if the PA is deleted or if
it overlaps with our request etc. The goal is to find an immediately
adjacent PA.
2. If the found PA is on right of original goal, use rb_prev() to find
the left adjacent PA.
3. Check if this PA is deleted and keep moving left with rb_prev() until
a non deleted PA is found.
4. This is the PA we are looking for. Now we can check if it can satisfy
the original request and proceed accordingly.
This approach also takes care of having deleted PAs in the tree.
(While we are at it, also fix a possible overflow bug in calculating the
end of a PA)
[1] https://lore.kernel.org/linux-ext4/CA+G9fYv2FRpLqBZf34ZinR8bU2_ZRAUOjKAD3+tKRFaEQHtt8Q@mail.gmail.com/
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_mb_use_preallocated未正确处理rbtree遍历，可能导致预分配空间重叠。
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-2023-53813 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2025-12-09 · 共 152 条
| CVE-2022-50666 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-40343 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-53794 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-40342 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53822 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53785 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40336 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53827 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40328 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53851 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40337 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50656 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53803 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53800 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53860 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53829 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53790 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53836 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53810 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53846 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 152 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2023-53813
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