CVE-2023-54121— 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btrfs_drop_extent_map_range中不正确的分割逻辑，可能导致WARN_ON触发。
可能的 ATT&CK 技术 1 AI
T1564.008 · Email Hiding Rules影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 55ef68990029fcd8d04d42fc184aa7fb18cf309e< 9f68e2105dd96cf0fafffffafb2337fbd0fbae1f |
affected |
55ef68990029fcd8d04d42fc184aa7fb18cf309e< b43a4c99d878cf5e59040e45c96bb0a8358bfb3b |
affected | ||
55ef68990029fcd8d04d42fc184aa7fb18cf309e< c962098ca4af146f2625ed64399926a098752c9c |
affected | ||
c87afd35a28b2661a2626a1b28e9fd69adcad9f9 |
affected | ||
2.6.32.19< 2.6.33 |
affected | ||
2.6.33 |
affected | ||
< 2.6.33 |
unaffected | ||
6.1.47≤ 6.1.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2023-54121 基础信息
漏洞信息
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Vulnerability Title
btrfs: fix incorrect splitting in btrfs_drop_extent_map_range
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix incorrect splitting in btrfs_drop_extent_map_range
In production we were seeing a variety of WARN_ON()'s in the extent_map
code, specifically in btrfs_drop_extent_map_range() when we have to call
add_extent_mapping() for our second split.
Consider the following extent map layout
PINNED
[0 16K) [32K, 48K)
and then we call btrfs_drop_extent_map_range for [0, 36K), with
skip_pinned == true. The initial loop will have
start = 0
end = 36K
len = 36K
we will find the [0, 16k) extent, but since we are pinned we will skip
it, which has this code
start = em_end;
if (end != (u64)-1)
len = start + len - em_end;
em_end here is 16K, so now the values are
start = 16K
len = 16K + 36K - 16K = 36K
len should instead be 20K. This is a problem when we find the next
extent at [32K, 48K), we need to split this extent to leave [36K, 48k),
however the code for the split looks like this
split->start = start + len;
split->len = em_end - (start + len);
In this case we have
em_end = 48K
split->start = 16K + 36K // this should be 16K + 20K
split->len = 48K - (16K + 36K) // this overflows as 16K + 36K is 52K
and now we have an invalid extent_map in the tree that potentially
overlaps other entries in the extent map. Even in the non-overlapping
case we will have split->start set improperly, which will cause problems
with any block related calculations.
We don't actually need len in this loop, we can simply use end as our
end point, and only adjust start up when we find a pinned extent we need
to skip.
Adjust the logic to do this, which keeps us from inserting an invalid
extent map.
We only skip_pinned in the relocation case, so this is relatively rare,
except in the case where you are running relocation a lot, which can
happen with auto relocation on.
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btrfs_drop_extent_map_range中不正确的分割逻辑，可能导致WARN_ON触发。
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-2023-54121 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2023-54121 其他参考 (3)
同批安全公告 · Linux · 2025-12-24 · 共 322 条
| CVE-2023-54076 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-50717 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68745 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68741 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-54090 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-54094 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-53867 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68359 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68726 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-53996 | 9.3 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-54071 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-54060 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-54043 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50732 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68736 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-54040 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-54092 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-54120 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53986 | 8.6 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50746 | 8.4 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 322 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2023-54121
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