172 lines
9.4 KiB
JSON
172 lines
9.4 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-2024-42233",
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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": "2024-07-30T07:40:12.251Z",
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"datePublished": "2024-08-07T15:14:23.858Z",
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"dateUpdated": "2026-08-05T11:35:58.248Z"
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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": "2026-08-05T11:35:58.248Z"
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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\nfilemap: replace pte_offset_map() with pte_offset_map_nolock()\n\nThe vmf->ptl in filemap_fault_recheck_pte_none() is still set from\nhandle_pte_fault(). But at the same time, we did a pte_unmap(vmf->pte). \nAfter a pte_unmap(vmf->pte) unmap and rcu_read_unlock(), the page table\nmay be racily changed and vmf->ptl maybe fails to protect the actual page\ntable. Fix this by replacing pte_offset_map() with\npte_offset_map_nolock().\n\nAs David said, the PTL pointer might be stale so if we continue to use\nit infilemap_fault_recheck_pte_none(), it might trigger UAF. Also, if\nthe PTL fails, the issue fixed by commit 58f327f2ce80 (\"filemap: avoid\nunnecessary major faults in filemap_fault()\") might reappear."
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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 triggered by a normal page fault on a locally mmap'ed file, reached through mmap/mlock2/madvise syscalls by a process on the machine. There is no network-facing path to `filemap_fault()`.\nAC:L - Although a race is involved, the attacker owns both sides of it: one thread faults on its own mlocked, page-cache-cold file mapping while another unprivileged thread issues `MADV_COLLAPSE`, and both only need `mmap_lock` read so they run concurrently. All preconditions (VM_LOCKED, pte_none, page-cache miss, page-table collapse) are set up deterministically by the attacker and the attempt can be retried in a tight loop.\nPR:L - Only an ordinary unprivileged local user account is required — `can_do_mlock()` passes on the default nonzero RLIMIT_MEMLOCK with no capability, and `MADV_COLLAPSE` requires no privilege. No root, no CAP_* and no namespace tricks are needed.\nUI:N - The attacker's own threads perform every step — mapping and locking a file, faulting on it, and collapsing the page table. No victim action or interaction is involved.\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority; there is no crossing of a VM, IOMMU, or other security-authority boundary.\nC:H - This is a use-after-free on the split page-table lock: `spin_lock()`/`spin_unlock()` read a freed object that the attacker can have reallocated with sprayed content, and the resulting slab/`struct page` metadata corruption (overlapping allocations) is a well-known route to arbitrary kernel memory disclosure.\nI:H - Taking the stale lock writes into freed memory — either a reallocated `kmem_cache` object (ALLOC_SPLIT_PTLOCKS) or word 5 of a reused `struct page`, which aliases `struct slab::counters` (inuse/objects/frozen) and `page->private`. Corrupting slab metadata yields overlapping object allocations and a path to arbitrary write and control-flow hijack.\nA:H - A use-after-free on a spinlock reliably produces oopses, slab corruption panics, and deadlocks/hangs when the freed lock word is reused and never released. Any unprivileged user can trigger it repeatedly to crash the system."
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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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"mm/filemap.c"
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],
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"versions": [
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{
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"version": "58f327f2ce80f9c7b4a70e9cf017ae8810d44a20",
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"lessThan": "6a6c2aec1a89506595801b4cf7e8eef035f33748",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "58f327f2ce80f9c7b4a70e9cf017ae8810d44a20",
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"lessThan": "24be02a42181f0707be0498045c4c4b13273b16d",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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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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"mm/filemap.c"
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],
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"versions": [
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{
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"version": "6.9",
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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": "6.9",
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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": "6.9.10",
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"lessThanOrEqual": "6.9.*",
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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": "6.10",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.9",
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"versionEndExcluding": "6.9.10"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.9",
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/6a6c2aec1a89506595801b4cf7e8eef035f33748"
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},
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{
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"url": "https://git.kernel.org/stable/c/24be02a42181f0707be0498045c4c4b13273b16d"
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}
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],
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"title": "filemap: replace pte_offset_map() with pte_offset_map_nolock()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-42233",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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"version": "2.0.3",
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"timestamp": "2024-09-10T16:14:13.816205Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"dateUpdated": "2024-09-11T17:34:32.513Z"
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