CVE-2026-43068 (GCVE-0-2026-43068)

Vulnerability from cvelistv5 – Published: 2026-05-05 15:23 – Updated: 2026-05-11 22:17
VLAI?
Title
ext4: avoid allocate block from corrupted group in ext4_mb_find_by_goal()
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 163a203ddb36c36d4a1c942aececda0cc8d06aa7 , < fea6b2e250ff48f10d166011b57a8516ae5438c9 (git)
Affected: 163a203ddb36c36d4a1c942aececda0cc8d06aa7 , < 0b84571c886719823d537f05f4f07cad6357c4b7 (git)
Affected: 163a203ddb36c36d4a1c942aececda0cc8d06aa7 , < ffc0a282462d45fee5957621be5afa29752f3b6d (git)
Affected: 163a203ddb36c36d4a1c942aececda0cc8d06aa7 , < 2d31a5073f86a177edf44015e0dedb0c47cfd6d8 (git)
Affected: 163a203ddb36c36d4a1c942aececda0cc8d06aa7 , < 9370207b36d26e45a8c8ef0500706d37036edd6b (git)
Affected: 163a203ddb36c36d4a1c942aececda0cc8d06aa7 , < 1895f7904be71c48f1e6f338b28f24dabd6b8aeb (git)
Affected: 163a203ddb36c36d4a1c942aececda0cc8d06aa7 , < 1c0d7c4cde38a887c6d74e0c89ddb25226943c78 (git)
Affected: 163a203ddb36c36d4a1c942aececda0cc8d06aa7 , < 46066e3a06647c5b186cc6334409722622d05c44 (git)
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Linux Linux Affected: 3.12
Unaffected: 0 , < 3.12 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "fs/ext4/mballoc.c"
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "7.0",
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            }
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      "cpeApplicability": [
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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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:17:05.953Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fea6b2e250ff48f10d166011b57a8516ae5438c9"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b84571c886719823d537f05f4f07cad6357c4b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/ffc0a282462d45fee5957621be5afa29752f3b6d"
        },
        {
          "url": "https://git.kernel.org/stable/c/2d31a5073f86a177edf44015e0dedb0c47cfd6d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/9370207b36d26e45a8c8ef0500706d37036edd6b"
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        {
          "url": "https://git.kernel.org/stable/c/1c0d7c4cde38a887c6d74e0c89ddb25226943c78"
        },
        {
          "url": "https://git.kernel.org/stable/c/46066e3a06647c5b186cc6334409722622d05c44"
        }
      ],
      "title": "ext4: avoid allocate block from corrupted group in ext4_mb_find_by_goal()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43068",
    "datePublished": "2026-05-05T15:23:27.371Z",
    "dateReserved": "2026-05-01T14:12:55.982Z",
    "dateUpdated": "2026-05-11T22:17:05.953Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-43068",
      "date": "2026-05-20",
      "epss": "0.00032",
      "percentile": "0.09344"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43068\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-05T16:16:16.053\",\"lastModified\":\"2026-05-20T23:09:44.863\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.12\",\"versionEndExcluding\":\"5.10.253\",\"matchCriteriaId\":\"0ECA9FA3-7D5A-47DF-96CD-50ED0F72C020\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.203\",\"matchCriteriaId\":\"20DDB3E9-AABF-4107-ADB0-5362AA067045\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.168\",\"matchCriteriaId\":\"E2DDDCA1-6DAB-4018-B920-8F045DDD8D3B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.131\",\"matchCriteriaId\":\"CE6ED4D4-0046-4573-BFA9-D64143B6A89F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.80\",\"matchCriteriaId\":\"97EB19EC-A11E-49C6-9D2F-6F6EC6CB98B6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.21\",\"matchCriteriaId\":\"ED39847A-3B46-4729-B7CA-B2C30B9FA8FE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.11\",\"matchCriteriaId\":\"4CA2E747-A9EC-4518-9AA2-B4247FC748B7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F253B622-8837-4245-BCE5-A7BF8FC76A16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F666C8D8-6538-46D4-B318-87610DE64C34\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"02259FDA-961B-47BC-AE7F-93D7EC6E90C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"58A9FEFF-C040-420D-8F0A-BFDAAA1DF258\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"1D2315C0-D46F-4F85-9754-F9E5E11374A6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"512EE3A8-A590-4501-9A94-5D4B268D6138\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0b84571c886719823d537f05f4f07cad6357c4b7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1895f7904be71c48f1e6f338b28f24dabd6b8aeb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1c0d7c4cde38a887c6d74e0c89ddb25226943c78\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2d31a5073f86a177edf44015e0dedb0c47cfd6d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/46066e3a06647c5b186cc6334409722622d05c44\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9370207b36d26e45a8c8ef0500706d37036edd6b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fea6b2e250ff48f10d166011b57a8516ae5438c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ffc0a282462d45fee5957621be5afa29752f3b6d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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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.