CVE-2022-48829 (GCVE-0-2022-48829)
Vulnerability from cvelistv5
Published
2024-07-16 11:44
Modified
2026-08-05 08:52
Severity ?
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix NFSv3 SETATTR/CREATE's handling of large file sizes iattr::ia_size is a loff_t, so these NFSv3 procedures must be careful to deal with incoming client size values that are larger than s64_max without corrupting the value. Silently capping the value results in storing a different value than the client passed in which is unexpected behavior, so remove the min_t() check in decode_sattr3(). Note that RFC 1813 permits only the WRITE procedure to return NFS3ERR_FBIG. We believe that NFSv3 reference implementations also return NFS3ERR_FBIG when ia_size is too large.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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a remote client triggers it by sending an NFSv3 SETATTR/CREATE with a file size larger than S64_MAX over the network.\\nAC:L - The attacker fully controls the sattr3 size field and can deterministically supply any u64 greater than S64_MAX; the silent min_t() capping and subsequent nfsd_setattr/notify_change path require no race or attacker-uncontrollable conditions.\\nPR:N - Typical nfsd deployments accept AUTH_SYS/AUTH_NULL on reachable exports, so a network peer can obtain a filehandle and assert a writable UID without verified credentials; NFSv3 SETATTR/CREATE with ATTR_SIZE then proceeds under those unauthenticated credentials.\\nUI:N - The attacker alone mounts/looks up and issues SETATTR or CREATE with an oversized size; no victim user action is required beyond nfsd already exporting a writable filesystem.\\nS:U - Impact is confined to the NFS server\u0027s own kernel/filesystem state under the same OS security authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\\nC:N - The flaw silently substitutes NFS_OFFSET_MAX for an oversized client size and applies that via setattr; it does not create an OOB/UAF read or other information-disclosure primitive.\\nI:H - Silently capping oversized sizes to NFS_OFFSET_MAX causes nfsd to apply a maximum file size on filesystems whose s_maxbytes allows it (e.g. XFS with MAX_LFS_FILESIZE), corrupting the file\u0027s size attribute relative to the protocol\u0027s reject-oversized policy; when uncertain versus Low, High is required.\\nA:H - Applying a S64_MAX file size via SETATTR/CREATE enables enormous sparse files and edge-case VFS/filesystem behavior at OFFSET_MAX that can deny service for the exported data and destabilize subsequent operations on that inode; when uncertain versus Low, High is required.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"72c14aed6838b5d90b4dd926b6a339b34bb02e08\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"a231ae6bb50e7c0a9e9efd7b0d10687f1d71b3a3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"37f2d2cd8eadddbbd9c7bda327a9393399b2f89b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"aa9051ddb4b378bd22e72a67bc77b9fc1482c5f0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"a648fdeb7c0e17177a2280344d015dba3fbe3314\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/nfsd/nfs3xdr.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\": \"5.4.295\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.220\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.24\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.16.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nfsd/nfs3xdr.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/72c14aed6838b5d90b4dd926b6a339b34bb02e08\"}, {\"url\": \"https://git.kernel.org/stable/c/a231ae6bb50e7c0a9e9efd7b0d10687f1d71b3a3\"}, {\"url\": \"https://git.kernel.org/stable/c/37f2d2cd8eadddbbd9c7bda327a9393399b2f89b\"}, {\"url\": \"https://git.kernel.org/stable/c/aa9051ddb4b378bd22e72a67bc77b9fc1482c5f0\"}, {\"url\": \"https://git.kernel.org/stable/c/a648fdeb7c0e17177a2280344d015dba3fbe3314\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nNFSD: Fix NFSv3 SETATTR/CREATE\u0027s handling of large file sizes\\n\\niattr::ia_size is a loff_t, so these NFSv3 procedures must be\\ncareful to deal with incoming client size values that are larger\\nthan s64_max without corrupting the value.\\n\\nSilently capping the value results in storing a different value\\nthan the client passed in which is unexpected behavior, so remove\\nthe min_t() check in decode_sattr3().\\n\\nNote that RFC 1813 permits only the WRITE procedure to return\\nNFS3ERR_FBIG. We believe that NFSv3 reference implementations\\nalso return NFS3ERR_FBIG when ia_size is too large.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.295\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.220\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.24\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.10\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17\", \"versionStartIncluding\": \"2.6.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:52:34.299Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48829\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:52:34.299Z\", \"dateReserved\": \"2024-07-16T11:38:08.903Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-16T11:44:13.313Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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