411 lines
20 KiB
JSON
411 lines
20 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2021-47478",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-22T06:20:56.200Z",
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"datePublished": "2024-05-22T08:19:31.521Z",
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"dateUpdated": "2026-08-05T08:47:59.496Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:47:59.496Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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"version": "3.1",
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"baseScore": 9.1,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/isofs/inode.c"
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],
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"status": "affected",
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],
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{
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"version": "2.6.12",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "2.6.12",
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"status": "unaffected",
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"version": "4.4.292",
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"lessThanOrEqual": "4.4.*",
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"status": "unaffected",
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},
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"lessThanOrEqual": "4.9.*",
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},
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"lessThanOrEqual": "4.14.*",
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"status": "unaffected",
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},
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{
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"version": "4.19.217",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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},
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"lessThanOrEqual": "5.14.*",
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"version": "5.15.2",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"status": "unaffected",
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