CVE-2021-47004

High

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.

Package Linux Kernel
Published 2024-02-28
Last modified 2025-01-08
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

7.1

out of 10
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Affected versions

Linux kernel versions 4.20 and later are affected. Fixed in 5.10.38, 5.11.22, 5.12.5, 5.13 and their respective stable series.

Affected from
≥ 4.20
Fixed in
✓ 5.10.38 5.10.x ✓ 5.11.22 5.11.x ✓ 5.12.5 5.12.x ✓ 5.13

References

4 total

Frequently asked questions

  • What is CVE-2021-47004?

    CVE-2021-47004 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 . It affects Linux kernel versions from 4.20 onward and has been patched in 5.10.38, 5.11.22, 5.12.5 and others. CVE-2021-47004 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2021-47004?

    CVE-2021-47004 has a CVSS score of 7.1 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H .

  • Is there a patch available for CVE-2021-47004?

    Yes. CVE-2021-47004 has been patched. Fixed versions include 5.10.38, 5.11.22, 5.12.5 and others. If you are running Linux kernel 4.20 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2021-47004 actively exploited?

    No. CVE-2021-47004 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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