{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-47478", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-22T06:20:56.200Z", "datePublished": "2024-05-22T08:19:31.521Z", "dateUpdated": "2026-08-05T08:47:59.496Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:47:59.496Z" }, "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - isofs implements export_operations, and nfsd decodes client filehandles via isofs_fh_to_dentry into isofs_read_inode with attacker-chosen block/offset. 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->b_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": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/isofs/inode.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "156ce5bb6cc43a80a743810199defb1dc3f55b7f", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "9ec33a9b8790c212cc926a88c5e2105f97f3f57e", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "afbd40f425227e661d991757e11cc4db024e761f", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b0ddff8d68f2e43857a84dce54c3deab181c8ae1", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6e80e9314f8bb52d9eabe1907698718ff01120f5", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "86d4aedcbc69c0f84551fb70f953c24e396de2d7", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b2fa1f52d22c5455217b294629346ad23a744945", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e7fb722586a2936b37bdff096c095c30ca06404d", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e96a1866b40570b5950cda8602c2819189c62a48", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/isofs/inode.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "4.4.292", "lessThanOrEqual": "4.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.290", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.255", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.217", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.159", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.79", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.14.18", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.2", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "4.4.292" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "4.9.290" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "4.14.255" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "4.19.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.4.159" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.79" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.14.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.16" } ] } ] } ], "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" } ], "title": "isofs: Fix out of bound access for corrupted isofs image", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-125", "lang": "en", "description": "CWE-125 Out-of-bounds Read" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-05-29T18:36:21.366364Z", "id": "CVE-2021-47478", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-11-07T15:12:42.793Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.618Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/156ce5bb6cc43a80a743810199defb1dc3f55b7f", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/9ec33a9b8790c212cc926a88c5e2105f97f3f57e", "tags": [ "x_transferred" ] }, { "url": 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