383 lines
19 KiB
JSON
383 lines
19 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-2023-52804",
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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": "2024-05-21T15:19:24.247Z",
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"datePublished": "2024-05-21T15:31:15.720Z",
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"dateUpdated": "2026-08-05T09:11:29.986Z"
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},
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:11:29.986Z"
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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\nfs/jfs: Add validity check for db_maxag and db_agpref\n\nBoth db_maxag and db_agpref are used as the index of the\ndb_agfree array, but there is currently no validity check for\ndb_maxag and db_agpref, which can lead to errors.\n\nThe following is related bug reported by Syzbot:\n\nUBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:639:20\nindex 7936 is out of range for type 'atomic_t[128]'\n\nAdd checking that the values of db_maxag and db_agpref are valid\nindexes for the db_agfree array."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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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:L - The bug is reached by mounting a crafted JFS block-device image (e.g. loop/USB) and then performing local filesystem operations; it is not reachable via remote packet parsing.\nAC:L - The attacker fully controls the on-disk bmap fields and can set db_agpref/db_maxag to out-of-range values that reliably trigger the OOB paths on subsequent allocations (e.g. symlink → dbAlloc → dbNextAG).\nPR:L - An unprivileged local user can supply a malicious JFS image and have it mounted via common low-privilege mount helpers (e.g. udisks), then trigger the bug with ordinary file-creating syscalls on that mount.\nUI:N - No separate victim action is required once the attacker can mount their own crafted image and exercise write paths such as symlink/create on it.\nS:U - Impact is confined to the local kernel/host authority (memory corruption / privilege escalation within the same system); it does not cross a VM, IOMMU, or other security boundary.\nC:H - Attacker-controlled indexes cause large out-of-bounds reads of kernel heap (db_active/db_agfree and related structures), which can disclose arbitrary adjacent memory.\nI:H - Out-of-range db_maxag drives OOB AG_LOCK/diAllocAG and related allocator updates past MAXAG-sized arrays, enabling heap corruption and control-flow/integrity compromise.\nA:H - The same OOB accesses reliably produce kernel UBSAN/KASAN failures and can oops/panic or otherwise crash the kernel."
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}
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]
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}
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],
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"fs/jfs/jfs_dmap.c"
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],
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"version": "0",
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