342 lines
17 KiB
JSON
342 lines
17 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-2024-43858",
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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": "2024-08-17T09:11:59.279Z",
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"datePublished": "2024-08-17T09:24:27.976Z",
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"dateUpdated": "2026-10-15T00:48:28.619Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:36:50.250Z"
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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 diFree"
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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 vulnerability is reached by mounting a crafted JFS image and then unlinking a file, all through local syscalls (mount/unlink) on a block or loop device. No network protocol processing is involved.\nAC:L - The out-of-bounds index is taken verbatim from the on-disk `iagp->agstart` field, so the attacker picks the exact OOB offset deterministically in the image; there is no race and no reliance on conditions outside attacker control.\nPR:L - A low-privileged local user can supply the malicious JFS image on common desktop/kiosk configurations where udisks2/polkit permits an active session user to mount removable or loop-backed media, and the subsequent unlink that triggers `diFree` requires only ordinary write access to a directory on that filesystem.\nUI:N - Once the image is attached, no victim action is needed — the attacker's own unlink drives `jfs_evict_inode` into `diFree`, and automounters attach the media without any human step.\nS:U - The corruption stays within kernel memory under the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unchecked index produces out-of-bounds reads of `im_agctl[agno].numfree`/`numinos` and of the `im_aglock[agno]` mutex at an attacker-chosen offset, and the resulting heap corruption is a general primitive that can be leveraged for kernel memory disclosure.\nI:H - `imap->im_agctl[agno].inofree = iagno` writes an attacker-influenced 32-bit value at an attacker-chosen offset far outside the `struct inomap` allocation, and `mutex_lock()` on `im_aglock[agno]` writes a kernel pointer OOB — a controlled slab-corruption write primitive suitable for control-flow hijacking.\nA:H - Out-of-bounds writes into adjacent slab objects and locking a bogus mutex reliably produce oopses, hangs, or panics, and an OOB-read `numinos` of zero yields an immediate divide-error in the `(numfree * 100) / numinos` computation."
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}
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]
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}
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"defaultStatus": "unaffected",
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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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"versionType": "semver"
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},
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{
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"version": "4.19.320",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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"title": "jfs: Fix array-index-out-of-bounds in diFree",
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