FKIE_CVE-2026-43068

Vulnerability from fkie_nvd - Published: 2026-05-05 16:16 - Updated: 2026-05-20 23:09
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: avoid allocate block from corrupted group in ext4_mb_find_by_goal() There's issue as follows: ... EXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 206 at logical offset 0 with max blocks 1 with error 117 EXT4-fs (mmcblk0p1): This should not happen!! Data will be lost EXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 206 at logical offset 0 with max blocks 1 with error 117 EXT4-fs (mmcblk0p1): This should not happen!! Data will be lost EXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 206 at logical offset 0 with max blocks 1 with error 117 EXT4-fs (mmcblk0p1): This should not happen!! Data will be lost EXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 206 at logical offset 0 with max blocks 1 with error 117 EXT4-fs (mmcblk0p1): This should not happen!! Data will be lost EXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 2243 at logical offset 0 with max blocks 1 with error 117 EXT4-fs (mmcblk0p1): This should not happen!! Data will be lost EXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 2239 at logical offset 0 with max blocks 1 with error 117 EXT4-fs (mmcblk0p1): This should not happen!! Data will be lost EXT4-fs (mmcblk0p1): error count since last fsck: 1 EXT4-fs (mmcblk0p1): initial error at time 1765597433: ext4_mb_generate_buddy:760 EXT4-fs (mmcblk0p1): last error at time 1765597433: ext4_mb_generate_buddy:760 ... According to the log analysis, blocks are always requested from the corrupted block group. This may happen as follows: ext4_mb_find_by_goal ext4_mb_load_buddy ext4_mb_load_buddy_gfp ext4_mb_init_cache ext4_read_block_bitmap_nowait ext4_wait_block_bitmap ext4_validate_block_bitmap if (!grp || EXT4_MB_GRP_BBITMAP_CORRUPT(grp)) return -EFSCORRUPTED; // There's no logs. if (err) return err; // Will return error ext4_lock_group(ac->ac_sb, group); if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))) // Unreachable goto out; After commit 9008a58e5dce ("ext4: make the bitmap read routines return real error codes") merged, Commit 163a203ddb36 ("ext4: mark block group as corrupt on block bitmap error") is no real solution for allocating blocks from corrupted block groups. This is because if 'EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info)' is true, then 'ext4_mb_load_buddy()' may return an error. This means that the block allocation will fail. Therefore, check block group if corrupted when ext4_mb_load_buddy() returns error.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b84571c886719823d537f05f4f07cad6357c4b7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1895f7904be71c48f1e6f338b28f24dabd6b8aebPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1c0d7c4cde38a887c6d74e0c89ddb25226943c78Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2d31a5073f86a177edf44015e0dedb0c47cfd6d8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/46066e3a06647c5b186cc6334409722622d05c44Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9370207b36d26e45a8c8ef0500706d37036edd6bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fea6b2e250ff48f10d166011b57a8516ae5438c9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ffc0a282462d45fee5957621be5afa29752f3b6dPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: avoid allocate block from corrupted group in ext4_mb_find_by_goal()\n\nThere\u0027s issue as follows:\n...\nEXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 206 at logical offset 0 with max blocks 1 with error 117\nEXT4-fs (mmcblk0p1): This should not happen!! Data will be lost\n\nEXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 206 at logical offset 0 with max blocks 1 with error 117\nEXT4-fs (mmcblk0p1): This should not happen!! Data will be lost\n\nEXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 206 at logical offset 0 with max blocks 1 with error 117\nEXT4-fs (mmcblk0p1): This should not happen!! Data will be lost\n\nEXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 206 at logical offset 0 with max blocks 1 with error 117\nEXT4-fs (mmcblk0p1): This should not happen!! Data will be lost\n\nEXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 2243 at logical offset 0 with max blocks 1 with error 117\nEXT4-fs (mmcblk0p1): This should not happen!! Data will be lost\n\nEXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 2239 at logical offset 0 with max blocks 1 with error 117\nEXT4-fs (mmcblk0p1): This should not happen!! Data will be lost\n\nEXT4-fs (mmcblk0p1): error count since last fsck: 1\nEXT4-fs (mmcblk0p1): initial error at time 1765597433: ext4_mb_generate_buddy:760\nEXT4-fs (mmcblk0p1): last error at time 1765597433: ext4_mb_generate_buddy:760\n...\n\nAccording to the log analysis, blocks are always requested from the\ncorrupted block group. This may happen as follows:\next4_mb_find_by_goal\n  ext4_mb_load_buddy\n   ext4_mb_load_buddy_gfp\n     ext4_mb_init_cache\n      ext4_read_block_bitmap_nowait\n      ext4_wait_block_bitmap\n       ext4_validate_block_bitmap\n        if (!grp || EXT4_MB_GRP_BBITMAP_CORRUPT(grp))\n         return -EFSCORRUPTED; // There\u0027s no logs.\n if (err)\n  return err;  // Will return error\next4_lock_group(ac-\u003eac_sb, group);\n  if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b-\u003ebd_info))) // Unreachable\n   goto out;\n\nAfter commit 9008a58e5dce (\"ext4: make the bitmap read routines return\nreal error codes\") merged, Commit 163a203ddb36 (\"ext4: mark block group\nas corrupt on block bitmap error\") is no real solution for allocating\nblocks from corrupted block groups. This is because if\n\u0027EXT4_MB_GRP_BBITMAP_CORRUPT(e4b-\u003ebd_info)\u0027 is true, then\n\u0027ext4_mb_load_buddy()\u0027 may return an error. This means that the block\nallocation will fail.\nTherefore, check block group if corrupted when ext4_mb_load_buddy()\nreturns error."
    }
  ],
  "id": "CVE-2026-43068",
  "lastModified": "2026-05-20T23:09:44.863",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2026-05-05T16:16:16.053",
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  "vulnStatus": "Analyzed",
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          "value": "CWE-401"
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      "source": "nvd@nist.gov",
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}


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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

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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.



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