CVE-2024-26956 (GCVE-0-2024-26956)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:18 – Updated: 2025-05-04 09:00
VLAI?
Title
nilfs2: fix failure to detect DAT corruption in btree and direct mappings
Summary
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix failure to detect DAT corruption in btree and direct mappings Patch series "nilfs2: fix kernel bug at submit_bh_wbc()". This resolves a kernel BUG reported by syzbot. Since there are two flaws involved, I've made each one a separate patch. The first patch alone resolves the syzbot-reported bug, but I think both fixes should be sent to stable, so I've tagged them as such. This patch (of 2): Syzbot has reported a kernel bug in submit_bh_wbc() when writing file data to a nilfs2 file system whose metadata is corrupted. There are two flaws involved in this issue. The first flaw is that when nilfs_get_block() locates a data block using btree or direct mapping, if the disk address translation routine nilfs_dat_translate() fails with internal code -ENOENT due to DAT metadata corruption, it can be passed back to nilfs_get_block(). This causes nilfs_get_block() to misidentify an existing block as non-existent, causing both data block lookup and insertion to fail inconsistently. The second flaw is that nilfs_get_block() returns a successful status in this inconsistent state. This causes the caller __block_write_begin_int() or others to request a read even though the buffer is not mapped, resulting in a BUG_ON check for the BH_Mapped flag in submit_bh_wbc() failing. This fixes the first issue by changing the return value to code -EINVAL when a conversion using DAT fails with code -ENOENT, avoiding the conflicting condition that leads to the kernel bug described above. Here, code -EINVAL indicates that metadata corruption was detected during the block lookup, which will be properly handled as a file system error and converted to -EIO when passing through the nilfs2 bmap layer.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c3a7abf06ce719a51139e62a034590be99abbc2c , < b67189690eb4b7ecc84ae16fa1e880e0123eaa35 (git)
Affected: c3a7abf06ce719a51139e62a034590be99abbc2c , < 9cbe1ad5f4354f4df1445e5f4883983328cd6d8e (git)
Affected: c3a7abf06ce719a51139e62a034590be99abbc2c , < c3b5c5c31e723b568f83d8cafab8629d9d830ffb (git)
Affected: c3a7abf06ce719a51139e62a034590be99abbc2c , < 2e2619ff5d0def4bb6c2037a32a6eaa28dd95c84 (git)
Affected: c3a7abf06ce719a51139e62a034590be99abbc2c , < 46b832e09d43b394ac0f6d9485d2b1a06593f0b7 (git)
Affected: c3a7abf06ce719a51139e62a034590be99abbc2c , < f69e81396aea66304d214f175aa371f1b5578862 (git)
Affected: c3a7abf06ce719a51139e62a034590be99abbc2c , < a8e4d098de1c0f4c5c1f2ed4633a860f0da6d713 (git)
Affected: c3a7abf06ce719a51139e62a034590be99abbc2c , < 82827ca21e7c8a91384c5baa656f78a5adfa4ab4 (git)
Affected: c3a7abf06ce719a51139e62a034590be99abbc2c , < f2f26b4a84a0ef41791bd2d70861c8eac748f4ba (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.31
Unaffected: 0 , < 2.6.31 (semver)
Unaffected: 4.19.312 , ≤ 4.19.* (semver)
Unaffected: 5.4.274 , ≤ 5.4.* (semver)
Unaffected: 5.10.215 , ≤ 5.10.* (semver)
Unaffected: 5.15.154 , ≤ 5.15.* (semver)
Unaffected: 6.1.84 , ≤ 6.1.* (semver)
Unaffected: 6.6.24 , ≤ 6.6.* (semver)
Unaffected: 6.7.12 , ≤ 6.7.* (semver)
Unaffected: 6.8.3 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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\"lessThan\": \"b67189690eb4b7ecc84ae16fa1e880e0123eaa35\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c3a7abf06ce719a51139e62a034590be99abbc2c\", \"lessThan\": \"9cbe1ad5f4354f4df1445e5f4883983328cd6d8e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c3a7abf06ce719a51139e62a034590be99abbc2c\", \"lessThan\": \"c3b5c5c31e723b568f83d8cafab8629d9d830ffb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c3a7abf06ce719a51139e62a034590be99abbc2c\", \"lessThan\": \"2e2619ff5d0def4bb6c2037a32a6eaa28dd95c84\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c3a7abf06ce719a51139e62a034590be99abbc2c\", \"lessThan\": \"46b832e09d43b394ac0f6d9485d2b1a06593f0b7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c3a7abf06ce719a51139e62a034590be99abbc2c\", \"lessThan\": \"f69e81396aea66304d214f175aa371f1b5578862\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c3a7abf06ce719a51139e62a034590be99abbc2c\", \"lessThan\": \"a8e4d098de1c0f4c5c1f2ed4633a860f0da6d713\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c3a7abf06ce719a51139e62a034590be99abbc2c\", \"lessThan\": \"82827ca21e7c8a91384c5baa656f78a5adfa4ab4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c3a7abf06ce719a51139e62a034590be99abbc2c\", \"lessThan\": \"f2f26b4a84a0ef41791bd2d70861c8eac748f4ba\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/nilfs2/btree.c\", \"fs/nilfs2/direct.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.31\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.31\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.312\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.274\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.215\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.154\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.84\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.24\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nilfs2/btree.c\", \"fs/nilfs2/direct.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b67189690eb4b7ecc84ae16fa1e880e0123eaa35\"}, {\"url\": \"https://git.kernel.org/stable/c/9cbe1ad5f4354f4df1445e5f4883983328cd6d8e\"}, {\"url\": \"https://git.kernel.org/stable/c/c3b5c5c31e723b568f83d8cafab8629d9d830ffb\"}, {\"url\": \"https://git.kernel.org/stable/c/2e2619ff5d0def4bb6c2037a32a6eaa28dd95c84\"}, {\"url\": \"https://git.kernel.org/stable/c/46b832e09d43b394ac0f6d9485d2b1a06593f0b7\"}, {\"url\": \"https://git.kernel.org/stable/c/f69e81396aea66304d214f175aa371f1b5578862\"}, {\"url\": \"https://git.kernel.org/stable/c/a8e4d098de1c0f4c5c1f2ed4633a860f0da6d713\"}, {\"url\": \"https://git.kernel.org/stable/c/82827ca21e7c8a91384c5baa656f78a5adfa4ab4\"}, {\"url\": \"https://git.kernel.org/stable/c/f2f26b4a84a0ef41791bd2d70861c8eac748f4ba\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnilfs2: fix failure to detect DAT corruption in btree and direct mappings\\n\\nPatch series \\\"nilfs2: fix kernel bug at submit_bh_wbc()\\\".\\n\\nThis resolves a kernel BUG reported by syzbot.  Since there are two\\nflaws involved, I\u0027ve made each one a separate patch.\\n\\nThe first patch alone resolves the syzbot-reported bug, but I think\\nboth fixes should be sent to stable, so I\u0027ve tagged them as such.\\n\\n\\nThis patch (of 2):\\n\\nSyzbot has reported a kernel bug in submit_bh_wbc() when writing file data\\nto a nilfs2 file system whose metadata is corrupted.\\n\\nThere are two flaws involved in this issue.\\n\\nThe first flaw is that when nilfs_get_block() locates a data block using\\nbtree or direct mapping, if the disk address translation routine\\nnilfs_dat_translate() fails with internal code -ENOENT due to DAT metadata\\ncorruption, it can be passed back to nilfs_get_block().  This causes\\nnilfs_get_block() to misidentify an existing block as non-existent,\\ncausing both data block lookup and insertion to fail inconsistently.\\n\\nThe second flaw is that nilfs_get_block() returns a successful status in\\nthis inconsistent state.  This causes the caller __block_write_begin_int()\\nor others to request a read even though the buffer is not mapped,\\nresulting in a BUG_ON check for the BH_Mapped flag in submit_bh_wbc()\\nfailing.\\n\\nThis fixes the first issue by changing the return value to code -EINVAL\\nwhen a conversion using DAT fails with code -ENOENT, avoiding the\\nconflicting condition that leads to the kernel bug described above.  Here,\\ncode -EINVAL indicates that metadata corruption was detected during the\\nblock lookup, which will be properly handled as a file system error and\\nconverted to -EIO when passing through the nilfs2 bmap layer.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.312\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.274\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.215\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.154\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.84\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.24\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.12\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.3\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"2.6.31\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:00:39.824Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26956\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T09:00:39.824Z\", \"dateReserved\": \"2024-02-19T14:20:24.200Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-01T05:18:56.101Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.



Detection rules are retrieved from Rulezet.