CVE-2022-49174— 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_mark_bb函数在flex_bg和fast_commit情况下未正确处理块组边界，导致内存越界访问。
可能的 ATT&CK 技术 1 AI
T1211 · Exploitation for Stealth影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2< cd6d719534af993210306f8a13f9cb3e615f7c8d |
affected |
8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2< 6a6beb074186a0452368a023a261c7d0eaebe838 |
affected | ||
8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2< b07eedd0222e9548ffc568ec429bb1f61d21a39c |
affected | ||
8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2< 803fb0e8240cc16585a5c9df76add1dfaa781773 |
affected | ||
8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2< bfdc502a4a4c058bf4cbb1df0c297761d528f54d |
affected | ||
5.10 |
affected | ||
< 5.10 |
unaffected | ||
5.10.110≤ 5.10.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2022-49174 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！
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Vulnerability Title
ext4: fix ext4_mb_mark_bb() with flex_bg with fast_commit
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix ext4_mb_mark_bb() with flex_bg with fast_commit
In case of flex_bg feature (which is by default enabled), extents for
any given inode might span across blocks from two different block group.
ext4_mb_mark_bb() only reads the buffer_head of block bitmap once for the
starting block group, but it fails to read it again when the extent length
boundary overflows to another block group. Then in this below loop it
accesses memory beyond the block group bitmap buffer_head and results
into a data abort.
for (i = 0; i < clen; i++)
if (!mb_test_bit(blkoff + i, bitmap_bh->b_data) == !state)
already++;
This patch adds this functionality for checking block group boundary in
ext4_mb_mark_bb() and update the buffer_head(bitmap_bh) for every different
block group.
w/o this patch, I was easily able to hit a data access abort using Power platform.
<...>
[ 74.327662] EXT4-fs error (device loop3): ext4_mb_generate_buddy:1141: group 11, block bitmap and bg descriptor inconsistent: 21248 vs 23294 free clusters
[ 74.533214] EXT4-fs (loop3): shut down requested (2)
[ 74.536705] Aborting journal on device loop3-8.
[ 74.702705] BUG: Unable to handle kernel data access on read at 0xc00000005e980000
[ 74.703727] Faulting instruction address: 0xc0000000007bffb8
cpu 0xd: Vector: 300 (Data Access) at [c000000015db7060]
pc: c0000000007bffb8: ext4_mb_mark_bb+0x198/0x5a0
lr: c0000000007bfeec: ext4_mb_mark_bb+0xcc/0x5a0
sp: c000000015db7300
msr: 800000000280b033
dar: c00000005e980000
dsisr: 40000000
current = 0xc000000027af6880
paca = 0xc00000003ffd5200 irqmask: 0x03 irq_happened: 0x01
pid = 5167, comm = mount
<...>
enter ? for help
[c000000015db7380] c000000000782708 ext4_ext_clear_bb+0x378/0x410
[c000000015db7400] c000000000813f14 ext4_fc_replay+0x1794/0x2000
[c000000015db7580] c000000000833f7c do_one_pass+0xe9c/0x12a0
[c000000015db7710] c000000000834504 jbd2_journal_recover+0x184/0x2d0
[c000000015db77c0] c000000000841398 jbd2_journal_load+0x188/0x4a0
[c000000015db7880] c000000000804de8 ext4_fill_super+0x2638/0x3e10
[c000000015db7a40] c0000000005f8404 get_tree_bdev+0x2b4/0x350
[c000000015db7ae0] c0000000007ef058 ext4_get_tree+0x28/0x40
[c000000015db7b00] c0000000005f6344 vfs_get_tree+0x44/0x100
[c000000015db7b70] c00000000063c408 path_mount+0xdd8/0xe70
[c000000015db7c40] c00000000063c8f0 sys_mount+0x450/0x550
[c000000015db7d50] c000000000035770 system_call_exception+0x4a0/0x4e0
[c000000015db7e10] c00000000000c74c system_call_common+0xec/0x250
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ext4_mb_mark_bb函数在flex_bg和fast_commit情况下未正确处理块组边界，导致内存越界访问。
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-2022-49174 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2022-49174 补丁与修复 (5)
同批安全公告 · Linux · 2025-02-26 · 共 706 条
| CVE-2022-49561 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49194 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49356 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49407 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49280 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49201 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49362 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49093 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49094 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49418 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49149 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49260 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49058 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49159 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49519 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49500 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49328 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49238 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49535 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49114 | 8.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 706 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2022-49174
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