CVE-2024-49958— 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ocfs2文件系统在附加reflink树前未预留足够的空间给内联xattr。
影响版本矩阵 30
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | ef962df057aaafd714f5c22ba3de1be459571fdf< 5c9807c523b4fca81d3e8e864dabc8c806402121 |
affected |
ef962df057aaafd714f5c22ba3de1be459571fdf< 74364cb578dcc0b6c9109519d19cbe5a56afac9a |
affected | ||
ef962df057aaafd714f5c22ba3de1be459571fdf< aac31d654a0a31cb0d2fa36ae694f4e164a52707 |
affected | ||
ef962df057aaafd714f5c22ba3de1be459571fdf< 020f5c53c17f66c0a8f2d37dad27ace301b8d8a1 |
affected | ||
ef962df057aaafd714f5c22ba3de1be459571fdf< 5c2072f02c0d75802ec28ec703b7d43a0dd008b5 |
affected | ||
ef962df057aaafd714f5c22ba3de1be459571fdf< 637c00e06564a945e9d0edb3d78d362d64935f9f |
affected | ||
ef962df057aaafd714f5c22ba3de1be459571fdf< 9f9a8f3ac65b4147f1a7b6c05fad5192c0e3c3d9 |
affected | ||
ef962df057aaafd714f5c22ba3de1be459571fdf< 96ce4c3537114d1698be635f5e36c62dc49df7a4 |
affected | ||
| … +22 条更多 | |||
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一、 漏洞 CVE-2024-49958 基础信息
漏洞信息
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Vulnerability Title
ocfs2: reserve space for inline xattr before attaching reflink tree
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: reserve space for inline xattr before attaching reflink tree
One of our customers reported a crash and a corrupted ocfs2 filesystem.
The crash was due to the detection of corruption. Upon troubleshooting,
the fsck -fn output showed the below corruption
[EXTENT_LIST_FREE] Extent list in owner 33080590 claims 230 as the next free chain record,
but fsck believes the largest valid value is 227. Clamp the next record value? n
The stat output from the debugfs.ocfs2 showed the following corruption
where the "Next Free Rec:" had overshot the "Count:" in the root metadata
block.
Inode: 33080590 Mode: 0640 Generation: 2619713622 (0x9c25a856)
FS Generation: 904309833 (0x35e6ac49)
CRC32: 00000000 ECC: 0000
Type: Regular Attr: 0x0 Flags: Valid
Dynamic Features: (0x16) HasXattr InlineXattr Refcounted
Extended Attributes Block: 0 Extended Attributes Inline Size: 256
User: 0 (root) Group: 0 (root) Size: 281320357888
Links: 1 Clusters: 141738
ctime: 0x66911b56 0x316edcb8 -- Fri Jul 12 06:02:30.829349048 2024
atime: 0x66911d6b 0x7f7a28d -- Fri Jul 12 06:11:23.133669517 2024
mtime: 0x66911b56 0x12ed75d7 -- Fri Jul 12 06:02:30.317552087 2024
dtime: 0x0 -- Wed Dec 31 17:00:00 1969
Refcount Block: 2777346
Last Extblk: 2886943 Orphan Slot: 0
Sub Alloc Slot: 0 Sub Alloc Bit: 14
Tree Depth: 1 Count: 227 Next Free Rec: 230
## Offset Clusters Block#
0 0 2310 2776351
1 2310 2139 2777375
2 4449 1221 2778399
3 5670 731 2779423
4 6401 566 2780447
....... .... .......
....... .... .......
The issue was in the reflink workfow while reserving space for inline
xattr. The problematic function is ocfs2_reflink_xattr_inline(). By the
time this function is called the reflink tree is already recreated at the
destination inode from the source inode. At this point, this function
reserves space for inline xattrs at the destination inode without even
checking if there is space at the root metadata block. It simply reduces
the l_count from 243 to 227 thereby making space of 256 bytes for inline
xattr whereas the inode already has extents beyond this index (in this
case up to 230), thereby causing corruption.
The fix for this is to reserve space for inline metadata at the destination
inode before the reflink tree gets recreated. The customer has verified the
fix.
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ocfs2文件系统在附加reflink树前未预留足够的空间给内联xattr。
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-2024-49958 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-49958 补丁与修复 (9)
同批安全公告 · Linux · 2024-10-21 · 共 372 条
| CVE-2024-49855 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-47695 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-48985 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50046 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50047 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50043 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50033 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49003 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-49996 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-47678 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-49939 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48962 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48960 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48954 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50029 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-49930 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-49982 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-47721 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-49950 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-47724 | 8.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 372 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-49958
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