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{
"dataType": "CVE_RECORD",
"cveMetadata": {
"cveId": "CVE-2023-52602",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-03-02T21:55:42.573Z",
"datePublished": "2024-03-06T06:45:29.227Z",
"dateUpdated": "2026-08-05T09:10:36.782Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: fix slab-out-of-bounds Read in dtSearch\n\nCurrently while searching for current page in the sorted entry table\nof the page there is a out of bound access. Added a bound check to fix\nthe error.\n\nDave:\nSet return code to -EIO"
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"value": "AV:L - The bug is reached only after a crafted JFS block/loop image is mounted locally and a directory lookup runs (openat/lookup → jfs_lookup → dtSearch); fs/jfs has no network or adjacent-protocol entry path.\nAC:L - The attacker fully controls on-disk dtree stbl slot indices (s8 values, including freelist sentinel -1), so a negative stbl entry deterministically drives &p->slot[stbl[index]] out of bounds on ordinary path lookup with no race or attacker-uncontrollable state.\nPR:L - JFS lacks FS_USERNS_MOUNT so mount(2) needs CAP_SYS_ADMIN, but 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 dtSearch with ordinary opens.\nUI:N - The attacker supplies the image, causes it to be mounted (including via automount/udisks on their own session), and drives lookups themselves; no separate victim action is required at exploitation time.\nS:U - The slab out-of-bounds read and any resulting kernel memory disclosure or crash remain within the host kernel’s security authority and do not cross a VM, IOMMU, or other boundary.\nC:H - A negative attacker-chosen stbl index makes ciCompare/dtCompare and getChild read ldtentry/idtentry fields from adjacent slab/metapage memory at a large offset (up to 128 slots × 32 bytes), an unbounded OOB read that can be leveraged for high-impact disclosure.\nI:H - OOB-derived slot contents are consumed as directory entry names, inumbers, and child PXDs (getChild uses &p->slot[stbl[index]] to pick the next dtree block), so corrupted values steer subsequent inode resolution and directory-mutation paths into kernel/metadata corruption; choose High under uncertainty consistent with sibling JFS scores.\nA:H - KASAN reports a slab-out-of-bounds read in dtSearch (syzkaller/kernel test robot), and reading far before the dtroot/dtpage slot array can fault on unmapped memory and oops/panic the kernel."
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