CVE-2021-47117
Here is the title: Huawei Linux kernel Ext4 Buffer Overflow Vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed We got follow bug_on when run fsstress with injecting IO fault: [130747.323114] kernel BUG at fs/ext4/extents_status.c:762! [130747.323117] Internal error: Oops - BUG: 0 [#1] SMP ...... [130747.334329] Call trace: [130747.334553] ext4_es_cache_extent+0x150/0x168 [ext4] [130747.334975] ext4_cache_extents+0x64/0xe8 [ext4] [130747.335368] ext4_find_extent+0x300/0x330 [ext4] [130747.335759] ext4_ext_map_blocks+0x74/0x1178 [ext4] [130747.336179] ext4_map_blocks+0x2f4/0x5f0 [ext4] [130747.336567] ext4_mpage_readpages+0x4a8/0x7a8 [ext4] [130747.336995] ext4_readpage+0x54/0x100 [ext4] [130747.337359] generic_file_buffered_read+0x410/0xae8 [130747.337767] generic_file_read_iter+0x114/0x190 [130747.338152] ext4_file_read_iter+0x5c/0x140 [ext4] [130747.338556] __vfs_read+0x11c/0x188 [130747.338851] vfs_read+0x94/0x150 [130747.339110] ksys_read+0x74/0xf0 This patch's modification is according to Jan Kara's suggestion in: https://patchwork.ozlabs.org/project/linux-ext4/patch/[email protected]/ "I see. Now I understand your patch. Honestly, seeing how fragile is trying to fix extent tree after split has failed in the middle, I would probably go even further and make sure we fix the tree properly in case of ENOSPC and EDQUOT (those are easily user triggerable). Anything else indicates a HW problem or fs corruption so I'd rather leave the extent tree as is and don't try to fix it (which also means we will not create overlapping extents)."
INFO
Published Date :
March 15, 2024, 9:15 p.m.
Last Modified :
Feb. 27, 2025, 3:20 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Linux kernel to a patched version.
- Reboot the system after the update.
Public PoC/Exploit Available at Github
CVE-2021-47117 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47117.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47117 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47117
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Ini adalah repository kumpulan CVE v.5
allcve cve cvelist newcve
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47117 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47117 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Feb. 27, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 from (excluding) 5.12.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 from (excluding) 5.10.43 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 from (excluding) 5.4.125 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 from (excluding) 4.19.194 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 from (excluding) 4.14.236 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.5 from (excluding) 4.9.272 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (excluding) 4.4.272 Added Reference Type CVE: https://git.kernel.org/stable/c/082cd4ec240b8734a82a89ffb890216ac98fec68 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/082cd4ec240b8734a82a89ffb890216ac98fec68 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/48105dc98c9ca35af418746277b087cb2bc6df7c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/48105dc98c9ca35af418746277b087cb2bc6df7c Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/569496aa3776eea1ff0d49d0174ac1b7e861e107 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/569496aa3776eea1ff0d49d0174ac1b7e861e107 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/5b3a9a2be59478b013a430ac57b0f3d65471b071 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5b3a9a2be59478b013a430ac57b0f3d65471b071 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/920697b004e49cb026e2e15fe91be065bf0741b7 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/920697b004e49cb026e2e15fe91be065bf0741b7 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/d3b668b96ad3192c0581a248ae2f596cd054792a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d3b668b96ad3192c0581a248ae2f596cd054792a Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/d8116743ef5432336289256b2f7c117299213eb9 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d8116743ef5432336289256b2f7c117299213eb9 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/e33bafad30d34cfa5e9787cb099cab05e2677fcb Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e33bafad30d34cfa5e9787cb099cab05e2677fcb Types: Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/082cd4ec240b8734a82a89ffb890216ac98fec68 Added Reference https://git.kernel.org/stable/c/48105dc98c9ca35af418746277b087cb2bc6df7c Added Reference https://git.kernel.org/stable/c/569496aa3776eea1ff0d49d0174ac1b7e861e107 Added Reference https://git.kernel.org/stable/c/5b3a9a2be59478b013a430ac57b0f3d65471b071 Added Reference https://git.kernel.org/stable/c/920697b004e49cb026e2e15fe91be065bf0741b7 Added Reference https://git.kernel.org/stable/c/d3b668b96ad3192c0581a248ae2f596cd054792a Added Reference https://git.kernel.org/stable/c/d8116743ef5432336289256b2f7c117299213eb9 Added Reference https://git.kernel.org/stable/c/e33bafad30d34cfa5e9787cb099cab05e2677fcb -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Mar. 15, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed We got follow bug_on when run fsstress with injecting IO fault: [130747.323114] kernel BUG at fs/ext4/extents_status.c:762! [130747.323117] Internal error: Oops - BUG: 0 [#1] SMP ...... [130747.334329] Call trace: [130747.334553] ext4_es_cache_extent+0x150/0x168 [ext4] [130747.334975] ext4_cache_extents+0x64/0xe8 [ext4] [130747.335368] ext4_find_extent+0x300/0x330 [ext4] [130747.335759] ext4_ext_map_blocks+0x74/0x1178 [ext4] [130747.336179] ext4_map_blocks+0x2f4/0x5f0 [ext4] [130747.336567] ext4_mpage_readpages+0x4a8/0x7a8 [ext4] [130747.336995] ext4_readpage+0x54/0x100 [ext4] [130747.337359] generic_file_buffered_read+0x410/0xae8 [130747.337767] generic_file_read_iter+0x114/0x190 [130747.338152] ext4_file_read_iter+0x5c/0x140 [ext4] [130747.338556] __vfs_read+0x11c/0x188 [130747.338851] vfs_read+0x94/0x150 [130747.339110] ksys_read+0x74/0xf0 This patch's modification is according to Jan Kara's suggestion in: https://patchwork.ozlabs.org/project/linux-ext4/patch/[email protected]/ "I see. Now I understand your patch. Honestly, seeing how fragile is trying to fix extent tree after split has failed in the middle, I would probably go even further and make sure we fix the tree properly in case of ENOSPC and EDQUOT (those are easily user triggerable). Anything else indicates a HW problem or fs corruption so I'd rather leave the extent tree as is and don't try to fix it (which also means we will not create overlapping extents)." Added Reference kernel.org https://git.kernel.org/stable/c/e33bafad30d34cfa5e9787cb099cab05e2677fcb [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/5b3a9a2be59478b013a430ac57b0f3d65471b071 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/d8116743ef5432336289256b2f7c117299213eb9 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/569496aa3776eea1ff0d49d0174ac1b7e861e107 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/920697b004e49cb026e2e15fe91be065bf0741b7 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/d3b668b96ad3192c0581a248ae2f596cd054792a [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/48105dc98c9ca35af418746277b087cb2bc6df7c [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/082cd4ec240b8734a82a89ffb890216ac98fec68 [No types assigned]