CVE-2021-47004 (GCVE-0-2021-47004)

Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2026-05-11 13:46
VLAI
Title
f2fs: fix to avoid touching checkpointed data in get_victim()
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4354994f097d068a894aa1a0860da54571df3582 , < 105155a8146ddb54c119d8318964eef3859d109d (git)
Affected: 4354994f097d068a894aa1a0860da54571df3582 , < 1e116f87825f01a6380286472196882746b16f63 (git)
Affected: 4354994f097d068a894aa1a0860da54571df3582 , < 211372b2571520e394b56b431a0705586013b3ff (git)
Affected: 4354994f097d068a894aa1a0860da54571df3582 , < 61461fc921b756ae16e64243f72af2bfc2e620db (git)
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Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.10.38 , ≤ 5.10.* (semver)
Unaffected: 5.11.22 , ≤ 5.11.* (semver)
Unaffected: 5.12.5 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T14:05:20+00:00",
      "cve": "CVE-2021-47004",
      "id": "CVE-2021-47004",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: f2fs: fix to avoid touching checkpointed data in get_victim()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47004.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-25T17:36:40Z",
      "cve": "CVE-2021-47004",
      "id": "CVE-2021-47004",
      "initial_release_date": "2024-03-01T04:07:57Z",
      "product_status:known_not_affected": "292",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47004",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47004.json",
      "version": "17"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2021-47004\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:02:08.051Z\", \"dateReserved\": \"2024-02-27T18:42:55.951Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-28T08:13:25.324Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.