CVE-2021-47460— 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，该漏洞源于从内联格式转换后会导致数据损坏。
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 22
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | acef5107e2eacb08a16ad5db60320d65bd26a6c0< 560edd14de2bf9dbc0129681eeb4d5ef87cc105f |
affected |
7ed80e77c908cbaa686529a49f8ae0060c5caee7< 8e6bfb4f70168ddfd32fb6dc028ad52faaf1f32e |
affected | ||
7ce2b16bad2cbfa3fa7bbc42c4448914f639ca47< a3a089c241cd49b33a8cdd7fcb37cc87a086912a |
affected | ||
f8a6a2ed4b7d1c3c8631eeb6d00572bc853094a8< b05caf023b14cbed9223bb5b48ecc7bffe38f632 |
affected | ||
6dbf7bb555981fb5faf7b691e8f6169fc2b2e63b< f1b98569e81c37d7e0deada7172f8f60860c1360 |
affected | ||
6dbf7bb555981fb5faf7b691e8f6169fc2b2e63b< fa9b6b6c953e3f6441ed6cf83b4c771dac2dae08 |
affected | ||
6dbf7bb555981fb5faf7b691e8f6169fc2b2e63b< 5314454ea3ff6fc746eaf71b9a7ceebed52888fa |
affected | ||
36ed9e604215f58cec0381ca5fcc6da05f2d87ca |
affected | ||
| … +14 条更多 | |||
获取后续新漏洞提醒
登录后订阅
一、 漏洞 CVE-2021-47460 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
ocfs2: fix data corruption after conversion from inline format
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: fix data corruption after conversion from inline format
Commit 6dbf7bb55598 ("fs: Don't invalidate page buffers in
block_write_full_page()") uncovered a latent bug in ocfs2 conversion
from inline inode format to a normal inode format.
The code in ocfs2_convert_inline_data_to_extents() attempts to zero out
the whole cluster allocated for file data by grabbing, zeroing, and
dirtying all pages covering this cluster. However these pages are
beyond i_size, thus writeback code generally ignores these dirty pages
and no blocks were ever actually zeroed on the disk.
This oversight was fixed by commit 693c241a5f6a ("ocfs2: No need to zero
pages past i_size.") for standard ocfs2 write path, inline conversion
path was apparently forgotten; the commit log also has a reasoning why
the zeroing actually is not needed.
After commit 6dbf7bb55598, things became worse as writeback code stopped
invalidating buffers on pages beyond i_size and thus these pages end up
with clean PageDirty bit but with buffers attached to these pages being
still dirty. So when a file is converted from inline format, then
writeback triggers, and then the file is grown so that these pages
become valid, the invalid dirtiness state is preserved,
mark_buffer_dirty() does nothing on these pages (buffers are already
dirty) but page is never written back because it is clean. So data
written to these pages is lost once pages are reclaimed.
Simple reproducer for the problem is:
xfs_io -f -c "pwrite 0 2000" -c "pwrite 2000 2000" -c "fsync" \
-c "pwrite 4000 2000" ocfs2_file
After unmounting and mounting the fs again, you can observe that end of
'ocfs2_file' has lost its contents.
Fix the problem by not doing the pointless zeroing during conversion
from inline format similarly as in the standard write path.
[akpm@linux-foundation.org: fix whitespace, per Joseph]
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，该漏洞源于从内联格式转换后会导致数据损坏。
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-2021-47460 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-2021-47460 的情报信息
请登录查看更多情报信息。
CVE-2021-47460 其他参考 (5)
同批安全公告 · Linux · 2024-05-22 · 共 63 条
| CVE-2021-47496 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47478 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47450 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47433 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47446 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47493 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47492 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47494 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47451 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47447 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47485 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47483 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47459 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47461 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47448 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47438 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47465 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47458 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47497 | Linux kernel 安全漏洞 | |
| CVE-2021-47498 | Linux kernel 安全漏洞 |
显示前 20 条，共 63 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2021-47460
暂无评论