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CVE-2022-50428

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

ext4: fix off-by-one errors in fast-commit block filling

Due to several different off-by-one errors, or perhaps due to a late change in design that wasn't fully reflected in the code that was actually merged, there are several very strange constraints on how fast-commit blocks are filled with tlv entries:

Also, strangely these constraints don't apply to the replay code in e2fsprogs, which will accept any tlvs in the blocks (with no bounds checks at all, but that is a separate issue...).

Given that this all seems to be a bug, let's fix it by just filling blocks with tlv entries in the natural way.

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Note that old kernels will be unable to replay fast-commit journals created by kernels that have this commit.

Detalles técnicos trazas, registros y código del informe original
- tlvs must start at least 10 bytes before the end of the block, even
  though the minimum tlv length is 8.  Otherwise, the replay code will
  ignore them.  (BUG: ext4_fc_reserve_space() could violate this
  requirement if called with a len of blocksize - 9 or blocksize - 8.
  Fortunately, this doesn't seem to happen currently.)

- tlvs must end at least 1 byte before the end of the block.  Otherwise
  the replay code will consider them to be invalid.  This quirk
  contributed to a bug (fixed by an earlier commit) where uninitialized
  memory was being leaked to disk in the last byte of blocks.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2022-50428",
  "cveTags": [],
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          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "programFiles": [
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  "published": "2025-10-01T12:15:34.403",
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          "value": "CWE-193"
        }
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix off-by-one errors in fast-commit block filling\n\nDue to several different off-by-one errors, or perhaps due to a late\nchange in design that wasn't fully reflected in the code that was\nactually merged, there are several very strange constraints on how\nfast-commit blocks are filled with tlv entries:\n\n- tlvs must start at least 10 bytes before the end of the block, even\n  though the minimum tlv length is 8.  Otherwise, the replay code will\n  ignore them.  (BUG: ext4_fc_reserve_space() could violate this\n  requirement if called with a len of blocksize - 9 or blocksize - 8.\n  Fortunately, this doesn't seem to happen currently.)\n\n- tlvs must end at least 1 byte before the end of the block.  Otherwise\n  the replay code will consider them to be invalid.  This quirk\n  contributed to a bug (fixed by an earlier commit) where uninitialized\n  memory was being leaked to disk in the last byte of blocks.\n\nAlso, strangely these constraints don't apply to the replay code in\ne2fsprogs, which will accept any tlvs in the blocks (with no bounds\nchecks at all, but that is a separate issue...).\n\nGiven that this all seems to be a bug, let's fix it by just filling\nblocks with tlv entries in the natural way.\n\nNote that old kernels will be unable to replay fast-commit journals\ncreated by kernels that have this commit."
    }
  ],
  "lastModified": "2026-06-17T05:23:32.120",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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