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-2023-52805",
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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": "2024-05-21T15:31:16.374Z",
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"dateUpdated": "2026-08-05T09:11:31.057Z"
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},
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"containers": {
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"cna": {
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"dateUpdated": "2026-08-05T09:11:31.057Z"
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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\njfs: fix array-index-out-of-bounds in diAlloc\n\nCurrently there is not check against the agno of the iag while\nallocating new inodes to avoid fragmentation problem. Added the check\nwhich is required."
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],
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"metrics": [
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{
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"cvssV3_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 only after a local mount of an attacker-crafted JFS image, then a create path (open/creat → jfs_create → ialloc → diAlloc); fs/jfs has no network or adjacent-protocol entry point.\nAC:L - agstart is taken from on-disk IAG metadata into the parent inode, so a crafted image sets agno (including the syzbot index -1) deterministically; creating a regular file then hits db_active[agno]/AG_LOCK/im_agctl with no race or attacker-uncontrollable state.\nPR:L - As with sibling JFS crafted-image CVEs, an unprivileged local session user can attach the malicious image via udisks2/polkit/automount on desktops, kiosks, and shared workstations, then trigger diAlloc with ordinary file creation.\nUI:N - The attacker supplies the image, causes it to be mounted (including via automount/udisks on their own session), and drives file creation themselves; no separate victim action is required at exploitation time.\nS:U - Out-of-bounds indexing of in-kernel bmap/imap arrays corrupts host kernel memory only and does not cross a VM, IOMMU, or other separate security authority.\nC:H - Invalid agno causes out-of-bounds reads of db_active[] and adjacent kernel/imap state; under the memory-corruption guidance this is reasonably leveraged for high confidentiality impact.\nI:H - The same bad agno indexes im_aglock[] and im_agctl[], and later allocation paths write im_agctl[agno].numfree and related map state, yielding out-of-bounds kernel writes suitable for control-flow hijacking.\nA:H - Syzbot reported UBSAN array-index-out-of-bounds in diAlloc (panic under UBSAN_TRAP/panic_on_warn), and the OOB lock/agctl accesses also produce kernel oopses and filesystem failure."
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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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"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/jfs/jfs_imap.c"
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"version": "0",
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"lessThan": "2.6.12",
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"status": "unaffected",
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"status": "unaffected",
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