CVE-2026-31448— 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，该漏洞源于插入新扩展失败时未删除扩展树中的数据，可能导致目录和xattr同时使用同一内存块，造成无限循环和锁阻塞。
影响版本矩阵 14
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 315054f023d28ee64f308adf8b5737831541776b< c66545e83a802c3851d9be27a41c0479dd29ff0c |
affected |
315054f023d28ee64f308adf8b5737831541776b< ecc50bfca9b5c2ee6aeef998181689b80477367b |
affected | ||
315054f023d28ee64f308adf8b5737831541776b< 3a7667595bcad84da53fc156a418e110267c3412 |
affected | ||
315054f023d28ee64f308adf8b5737831541776b< 416c86f30f91b4fb2642ef6b102596ca898f41a5 |
affected | ||
315054f023d28ee64f308adf8b5737831541776b< 64f425b06b3bea9abc8977fd3982779b3ad070c9 |
affected | ||
315054f023d28ee64f308adf8b5737831541776b< 5422fe71d26d42af6c454ca9527faaad4e677d6c |
affected | ||
2.6.22 |
affected | ||
< 2.6.22 |
unaffected | ||
| … +6 条更多 | |||
获取后续新漏洞提醒
登录后订阅
一、 漏洞 CVE-2026-31448 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: avoid infinite loops caused by residual data
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ext4: avoid infinite loops caused by residual data
On the mkdir/mknod path, when mapping logical blocks to physical blocks,
if inserting a new extent into the extent tree fails (in this example,
because the file system disabled the huge file feature when marking the
inode as dirty), ext4_ext_map_blocks() only calls ext4_free_blocks() to
reclaim the physical block without deleting the corresponding data in
the extent tree. This causes subsequent mkdir operations to reference
the previously reclaimed physical block number again, even though this
physical block is already being used by the xattr block. Therefore, a
situation arises where both the directory and xattr are using the same
buffer head block in memory simultaneously.
The above causes ext4_xattr_block_set() to enter an infinite loop about
"inserted" and cannot release the inode lock, ultimately leading to the
143s blocking problem mentioned in [1].
If the metadata is corrupted, then trying to remove some extent space
can do even more harm. Also in case EXT4_GET_BLOCKS_DELALLOC_RESERVE
was passed, remove space wrongly update quota information.
Jan Kara suggests distinguishing between two cases:
1) The error is ENOSPC or EDQUOT - in this case the filesystem is fully
consistent and we must maintain its consistency including all the
accounting. However these errors can happen only early before we've
inserted the extent into the extent tree. So current code works correctly
for this case.
2) Some other error - this means metadata is corrupted. We should strive to
do as few modifications as possible to limit damage. So I'd just skip
freeing of allocated blocks.
[1]
INFO: task syz.0.17:5995 blocked for more than 143 seconds.
Call Trace:
inode_lock_nested include/linux/fs.h:1073 [inline]
__start_dirop fs/namei.c:2923 [inline]
start_dirop fs/namei.c:2934 [inline]
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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，该漏洞源于插入新扩展失败时未删除扩展树中的数据，可能导致目录和xattr同时使用同一内存块，造成无限循环和锁阻塞。
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-2026-31448 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-2026-31448 的情报信息
请登录查看更多情报信息。
同批安全公告 · Linux · 2026-04-22 · 共 100 条
| CVE-2026-31463 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31436 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31501 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31444 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31478 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31432 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31433 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31435 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31450 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31476 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31513 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31464 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31449 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31490 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31494 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31502 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31479 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31504 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31505 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31446 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 100 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-31448
暂无评论