CVE-2021-47004
f2fs: fix to avoid touching checkpointed data in get_victim()
Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid touching checkpointed data in get_victim() In CP disabling mode, there are two issues when using LFS or SSR | AT_SSR mode to select victim: 1. LFS is set to find source section during GC, the victim should have no checkpointed data, since after GC, section could not be set free for reuse. Previously, we only check valid chpt blocks in current segment rather than section, fix it. 2. SSR | AT_SSR are set to find target segment for writes which can be fully filled by checkpointed and newly written blocks, we should never select such segment, otherwise it can cause panic or data corruption during allocation, potential case is described as below: a) target segment has 'n' (n < 512) ckpt valid blocks b) GC migrates 'n' valid blocks to other segment (segment is still in dirty list) c) GC migrates '512 - n' blocks to target segment (segment has 'n' cp_vblocks and '512 - n' vblocks) d) If GC selects target segment via {AT,}SSR allocator, however there is no free space in targe segment.
INFO
Published Date :
Feb. 28, 2024, 9:15 a.m.
Last Modified :
Jan. 8, 2025, 5:43 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- There is no known solution at this time.
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-2021-47004.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47004 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-2021-47004
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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47004 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47004 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.
-
Initial Analysis by [email protected]
Jan. 08, 2025
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H Added CWE NIST NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.10.38 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.11.22 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12 up to (excluding) 5.12.5 Changed Reference Type https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d No Types Assigned https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d Patch Changed Reference Type https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d No Types Assigned https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d Patch Changed Reference Type https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 No Types Assigned https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 Patch Changed Reference Type https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 No Types Assigned https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 Patch Changed Reference Type https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff No Types Assigned https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff Patch Changed Reference Type https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff No Types Assigned https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff Patch Changed Reference Type https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db No Types Assigned https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db Patch Changed Reference Type https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db No Types Assigned https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db 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/105155a8146ddb54c119d8318964eef3859d109d Added Reference https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 Added Reference https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff Added Reference https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db -
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
Feb. 28, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid touching checkpointed data in get_victim() In CP disabling mode, there are two issues when using LFS or SSR | AT_SSR mode to select victim: 1. LFS is set to find source section during GC, the victim should have no checkpointed data, since after GC, section could not be set free for reuse. Previously, we only check valid chpt blocks in current segment rather than section, fix it. 2. SSR | AT_SSR are set to find target segment for writes which can be fully filled by checkpointed and newly written blocks, we should never select such segment, otherwise it can cause panic or data corruption during allocation, potential case is described as below: a) target segment has 'n' (n < 512) ckpt valid blocks b) GC migrates 'n' valid blocks to other segment (segment is still in dirty list) c) GC migrates '512 - n' blocks to target segment (segment has 'n' cp_vblocks and '512 - n' vblocks) d) If GC selects target segment via {AT,}SSR allocator, however there is no free space in targe segment. Added Reference Linux https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db [No types assigned]