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Review reviewHigh

CVE-2021-47004

Linux Linux, linux kernel

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...

CVSS
7.1
EPSS
0.24%
14.6% percentile
CISA KEV
Not listed
Published
2024.02.28
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.24%
Technical severityCVSS 7.1

Vulnerability overview

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...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 4354994f097d068a894aa1a0860da54571df3582 < 105155a8146ddb54c119d8318964eef3859d109d, >= 4354994f097d068a894aa1a0860da54571df3582 < 1e116f87825f01a6380286472196882746b16f63, >= 4354994f097d068a894aa1a0860da54571df3582 < 211372b2571520e394b56b431a0705586013b3ff, >= 4354994f097d068a894aa1a0860da54571df3582 < 61461fc921b756ae16e64243f72af2bfc2e620db, >= 4.20, >= 4.20 < 5.10.38, >= 5.11 < 5.11.22, >= 5.12 < 5.12.5
Fixed versions
5.10.38, 5.11.22, 5.12.5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
CWE
Not available