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CVE-2021-47478 (GCVE-0-2021-47478)

Vulnerability from cvelistv5 – Published: 2024-05-22 08:19 – Updated: 2026-08-05 08:47
VLAI
Title
isofs: Fix out of bound access for corrupted isofs image
Summary
In the Linux kernel, the following vulnerability has been resolved: isofs: Fix out of bound access for corrupted isofs image When isofs image is suitably corrupted isofs_read_inode() can read data beyond the end of buffer. Sanity-check the directory entry length before using it.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-29 18:36 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 156ce5bb6cc43a80a743810199defb1dc3f55b7f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9ec33a9b8790c212cc926a88c5e2105f97f3f57e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < afbd40f425227e661d991757e11cc4db024e761f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b0ddff8d68f2e43857a84dce54c3deab181c8ae1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6e80e9314f8bb52d9eabe1907698718ff01120f5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 86d4aedcbc69c0f84551fb70f953c24e396de2d7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b2fa1f52d22c5455217b294629346ad23a744945 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e7fb722586a2936b37bdff096c095c30ca06404d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e96a1866b40570b5950cda8602c2819189c62a48 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 4.4.292 , ≤ 4.4.* (semver)
Unaffected: 4.9.290 , ≤ 4.9.* (semver)
Unaffected: 4.14.255 , ≤ 4.14.* (semver)
Unaffected: 4.19.217 , ≤ 4.19.* (semver)
Unaffected: 5.4.159 , ≤ 5.4.* (semver)
Unaffected: 5.10.79 , ≤ 5.10.* (semver)
Unaffected: 5.14.18 , ≤ 5.14.* (semver)
Unaffected: 5.15.2 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "redhat_vex": {
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      "current_release_date": "2026-02-02T10:48:45+00:00",
      "cve": "CVE-2021-47478",
      "id": "CVE-2021-47478",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: isofs: Fix out of bound access for corrupted isofs image",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47478.json",
      "version": "3"
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      "product_status:known_affected": "288",
      "product_status:known_not_affected": "199",
      "product_status:recommended": "627",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47478",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47478.json",
      "version": "62"
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A remote NFS client can therefore reach the bug over the network on a host that exports an iso9660 mount.\\nAC:L - The attacker fully controls the NFS filehandle block/offset and can aim at a byte near a buffer boundary whose length field is below sizeof(struct iso_directory_record), reliably taking the undersized de_len path. No race or layout outside attacker influence is required.\\nPR:N - In the highest-severity reasonable deployment, an iso9660 tree is NFS-exported with unauthenticated or otherwise unprivileged client access (common sec=sys/media-server setups). The remote attacker needs no privileges on the NFS server host.\\nUI:N - Once the iso9660 filesystem is exported, the attacker triggers isofs_read_inode by sending NFS requests with a crafted filehandle. No separate victim action such as mounting or opening a file is required at exploit time.\\nS:U - The out-of-bounds read occurs in the same kernel authority that runs nfsd/isofs. This is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\\nC:H - With de_len smaller than the directory-record struct, isofs_read_inode reads past a kmalloc(de_len) buffer or past bh-\u003eb_data; syzbot reported a KASAN use-after-free read in this path. That over-read can disclose adjacent kernel memory and can also surface through inode fields returned over NFS.\\nI:N - The defect is an out-of-bounds read of directory-entry fields into inode metadata, not an out-of-bounds write or other memory-modification primitive. No integrity impact beyond interpreting over-read bytes as ISO metadata is indicated.\\nA:H - The same invalid read was shown to fault under KASAN and can oops when it touches freed or unmapped memory beyond the undersized object or buffer_head. A remote client can repeat crafted filehandle lookups to cause a high-impact denial of service.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"156ce5bb6cc43a80a743810199defb1dc3f55b7f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"9ec33a9b8790c212cc926a88c5e2105f97f3f57e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"afbd40f425227e661d991757e11cc4db024e761f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"b0ddff8d68f2e43857a84dce54c3deab181c8ae1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"6e80e9314f8bb52d9eabe1907698718ff01120f5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"86d4aedcbc69c0f84551fb70f953c24e396de2d7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"b2fa1f52d22c5455217b294629346ad23a744945\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"e7fb722586a2936b37bdff096c095c30ca06404d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"e96a1866b40570b5950cda8602c2819189c62a48\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/isofs/inode.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.4.292\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.4.*\"}, {\"status\": \"unaffected\", \"version\": \"4.9.290\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.255\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.217\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.159\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.79\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.18\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/isofs/inode.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/156ce5bb6cc43a80a743810199defb1dc3f55b7f\"}, {\"url\": \"https://git.kernel.org/stable/c/9ec33a9b8790c212cc926a88c5e2105f97f3f57e\"}, {\"url\": \"https://git.kernel.org/stable/c/afbd40f425227e661d991757e11cc4db024e761f\"}, {\"url\": \"https://git.kernel.org/stable/c/b0ddff8d68f2e43857a84dce54c3deab181c8ae1\"}, {\"url\": \"https://git.kernel.org/stable/c/6e80e9314f8bb52d9eabe1907698718ff01120f5\"}, {\"url\": \"https://git.kernel.org/stable/c/86d4aedcbc69c0f84551fb70f953c24e396de2d7\"}, {\"url\": \"https://git.kernel.org/stable/c/b2fa1f52d22c5455217b294629346ad23a744945\"}, {\"url\": \"https://git.kernel.org/stable/c/e7fb722586a2936b37bdff096c095c30ca06404d\"}, {\"url\": \"https://git.kernel.org/stable/c/e96a1866b40570b5950cda8602c2819189c62a48\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nisofs: Fix out of bound access for corrupted isofs image\\n\\nWhen isofs image is suitably corrupted isofs_read_inode() can read data\\nbeyond the end of buffer. Sanity-check the directory entry length before\\nusing it.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.292\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.290\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.255\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.217\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.159\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.79\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.18\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.2\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"2.6.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:47:59.496Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47478\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:47:59.496Z\", \"dateReserved\": \"2024-05-22T06:20:56.200Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T08:19:31.521Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.