CVE-2021-47117 (GCVE-0-2021-47117)

Vulnerability from cvelistv5 – Published: 2024-03-15 20:14 – Updated: 2025-12-18 11:35
VLAI?
Title
ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed We got follow bug_on when run fsstress with injecting IO fault: [130747.323114] kernel BUG at fs/ext4/extents_status.c:762! [130747.323117] Internal error: Oops - BUG: 0 [#1] SMP ...... [130747.334329] Call trace: [130747.334553] ext4_es_cache_extent+0x150/0x168 [ext4] [130747.334975] ext4_cache_extents+0x64/0xe8 [ext4] [130747.335368] ext4_find_extent+0x300/0x330 [ext4] [130747.335759] ext4_ext_map_blocks+0x74/0x1178 [ext4] [130747.336179] ext4_map_blocks+0x2f4/0x5f0 [ext4] [130747.336567] ext4_mpage_readpages+0x4a8/0x7a8 [ext4] [130747.336995] ext4_readpage+0x54/0x100 [ext4] [130747.337359] generic_file_buffered_read+0x410/0xae8 [130747.337767] generic_file_read_iter+0x114/0x190 [130747.338152] ext4_file_read_iter+0x5c/0x140 [ext4] [130747.338556] __vfs_read+0x11c/0x188 [130747.338851] vfs_read+0x94/0x150 [130747.339110] ksys_read+0x74/0xf0 This patch's modification is according to Jan Kara's suggestion in: https://patchwork.ozlabs.org/project/linux-ext4/patch/20210428085158.3728201-1-yebin10@huawei.com/ "I see. Now I understand your patch. Honestly, seeing how fragile is trying to fix extent tree after split has failed in the middle, I would probably go even further and make sure we fix the tree properly in case of ENOSPC and EDQUOT (those are easily user triggerable). Anything else indicates a HW problem or fs corruption so I'd rather leave the extent tree as is and don't try to fix it (which also means we will not create overlapping extents)."
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: adb2355104b2109e06ba5276485d187d023b2fd2 , < e33bafad30d34cfa5e9787cb099cab05e2677fcb (git)
Affected: adb2355104b2109e06ba5276485d187d023b2fd2 , < 5b3a9a2be59478b013a430ac57b0f3d65471b071 (git)
Affected: adb2355104b2109e06ba5276485d187d023b2fd2 , < d8116743ef5432336289256b2f7c117299213eb9 (git)
Affected: adb2355104b2109e06ba5276485d187d023b2fd2 , < 569496aa3776eea1ff0d49d0174ac1b7e861e107 (git)
Affected: adb2355104b2109e06ba5276485d187d023b2fd2 , < 920697b004e49cb026e2e15fe91be065bf0741b7 (git)
Affected: adb2355104b2109e06ba5276485d187d023b2fd2 , < d3b668b96ad3192c0581a248ae2f596cd054792a (git)
Affected: adb2355104b2109e06ba5276485d187d023b2fd2 , < 48105dc98c9ca35af418746277b087cb2bc6df7c (git)
Affected: adb2355104b2109e06ba5276485d187d023b2fd2 , < 082cd4ec240b8734a82a89ffb890216ac98fec68 (git)
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    Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 4.4.272 , ≤ 4.4.* (semver)
Unaffected: 4.9.272 , ≤ 4.9.* (semver)
Unaffected: 4.14.236 , ≤ 4.14.* (semver)
Unaffected: 4.19.194 , ≤ 4.19.* (semver)
Unaffected: 5.4.125 , ≤ 5.4.* (semver)
Unaffected: 5.10.43 , ≤ 5.10.* (semver)
Unaffected: 5.12.10 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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\"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.236\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.194\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.125\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.43\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/extents.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e33bafad30d34cfa5e9787cb099cab05e2677fcb\"}, {\"url\": \"https://git.kernel.org/stable/c/5b3a9a2be59478b013a430ac57b0f3d65471b071\"}, {\"url\": \"https://git.kernel.org/stable/c/d8116743ef5432336289256b2f7c117299213eb9\"}, {\"url\": \"https://git.kernel.org/stable/c/569496aa3776eea1ff0d49d0174ac1b7e861e107\"}, {\"url\": \"https://git.kernel.org/stable/c/920697b004e49cb026e2e15fe91be065bf0741b7\"}, {\"url\": \"https://git.kernel.org/stable/c/d3b668b96ad3192c0581a248ae2f596cd054792a\"}, {\"url\": \"https://git.kernel.org/stable/c/48105dc98c9ca35af418746277b087cb2bc6df7c\"}, {\"url\": \"https://git.kernel.org/stable/c/082cd4ec240b8734a82a89ffb890216ac98fec68\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed\\n\\nWe got follow bug_on when run fsstress with injecting IO fault:\\n[130747.323114] kernel BUG at fs/ext4/extents_status.c:762!\\n[130747.323117] Internal error: Oops - BUG: 0 [#1] SMP\\n......\\n[130747.334329] Call trace:\\n[130747.334553]  ext4_es_cache_extent+0x150/0x168 [ext4]\\n[130747.334975]  ext4_cache_extents+0x64/0xe8 [ext4]\\n[130747.335368]  ext4_find_extent+0x300/0x330 [ext4]\\n[130747.335759]  ext4_ext_map_blocks+0x74/0x1178 [ext4]\\n[130747.336179]  ext4_map_blocks+0x2f4/0x5f0 [ext4]\\n[130747.336567]  ext4_mpage_readpages+0x4a8/0x7a8 [ext4]\\n[130747.336995]  ext4_readpage+0x54/0x100 [ext4]\\n[130747.337359]  generic_file_buffered_read+0x410/0xae8\\n[130747.337767]  generic_file_read_iter+0x114/0x190\\n[130747.338152]  ext4_file_read_iter+0x5c/0x140 [ext4]\\n[130747.338556]  __vfs_read+0x11c/0x188\\n[130747.338851]  vfs_read+0x94/0x150\\n[130747.339110]  ksys_read+0x74/0xf0\\n\\nThis patch\u0027s modification is according to Jan Kara\u0027s suggestion in:\\nhttps://patchwork.ozlabs.org/project/linux-ext4/patch/20210428085158.3728201-1-yebin10@huawei.com/\\n\\\"I see. Now I understand your patch. Honestly, seeing how fragile is trying\\nto fix extent tree after split has failed in the middle, I would probably\\ngo even further and make sure we fix the tree properly in case of ENOSPC\\nand EDQUOT (those are easily user triggerable).  Anything else indicates a\\nHW problem or fs corruption so I\u0027d rather leave the extent tree as is and\\ndon\u0027t try to fix it (which also means we will not create overlapping\\nextents).\\\"\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.272\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.272\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.236\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.194\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.125\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.43\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.10\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"3.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-18T11:35:41.694Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47117\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-18T11:35:41.694Z\", \"dateReserved\": \"2024-03-04T18:12:48.838Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-15T20:14:24.291Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.