174 lines
10 KiB
JSON
174 lines
10 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-2024-42234",
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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": "2024-07-30T07:40:12.252Z",
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"datePublished": "2024-08-07T15:14:24.467Z",
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"dateUpdated": "2026-08-05T11:35:59.332Z"
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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": "2026-08-05T11:35:59.332Z"
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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\nmm: fix crashes from deferred split racing folio migration\n\nEven on 6.10-rc6, I've been seeing elusive \"Bad page state\"s (often on\nflags when freeing, yet the flags shown are not bad: PG_locked had been\nset and cleared??), and VM_BUG_ON_PAGE(page_ref_count(page) == 0)s from\ndeferred_split_scan()'s folio_put(), and a variety of other BUG and WARN\nsymptoms implying double free by deferred split and large folio migration.\n\n6.7 commit 9bcef5973e31 (\"mm: memcg: fix split queue list crash when large\nfolio migration\") was right to fix the memcg-dependent locking broken in\n85ce2c517ade (\"memcontrol: only transfer the memcg data for migration\"),\nbut missed a subtlety of deferred_split_scan(): it moves folios to its own\nlocal list to work on them without split_queue_lock, during which time\nfolio->_deferred_list is not empty, but even the \"right\" lock does nothing\nto secure the folio and the list it is on.\n\nFortunately, deferred_split_scan() is careful to use folio_try_get(): so\nfolio_migrate_mapping() can avoid the race by folio_undo_large_rmappable()\nwhile the old folio's reference count is temporarily frozen to 0 - adding\nsuch a freeze in the !mapping case too (originally, folio lock and\nunmapping and no swap cache left an anon folio unreachable, so no freezing\nwas needed there: but the deferred split queue offers a way to reach it)."
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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 in core mm (THP deferred split queue vs. folio migration) and is reached entirely through local syscalls — mmap/madvise(MADV_HUGEPAGE)/munmap to queue folios, memory pressure to invoke the shrinker, and move_pages/mbind or direct compaction to migrate them. No network or physical access is involved.\nAC:L - The attacker controls both sides of the race and can create it deliberately: one thread loops partial-unmapping large anon folios onto the deferred split queue while others generate reclaim pressure and issue move_pages()/fault THPs to drive migration of those same folios. Retrying is free and unlimited, and no attacker-independent condition is required — the race was hit even accidentally under ordinary load.\nPR:L - Only an ordinary unprivileged local user is needed; move_pages() on the caller's own process requires just ptrace_may_access() on self and MPOL_MF_MOVE, not CAP_SYS_NICE, and THP allocation, partial unmap, and memory pressure need no capabilities at all.\nUI:N - The attacking process performs all steps itself with no victim action required; the shrinker and compaction/migration paths run autonomously in kernel context.\nS:U - The corruption is of kernel page/folio state within the same security authority as the exploited kernel; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The double free / refcount underflow returns a page to the buddy allocator while it is still mapped into the attacker's address space, allowing that page to be reallocated as a kernel slab page, page table, or kernel stack and read directly from userspace, giving arbitrary kernel memory disclosure.\nI:H - The same cross-allocation aliasing gives an arbitrary kernel write primitive — the attacker retains a writable userspace mapping of a page the kernel has re-handed to internal structures — plus the list corruption itself writes attacker-influenced pointers into the global split queue, making control-flow hijack and privilege escalation feasible.\nA:H - The reported symptoms are outright kernel crashes — \"Bad page state\", VM_BUG_ON_PAGE(page_ref_count(page) == 0), list_del corruption BUGs and assorted WARNs from double free — any of which panics or destabilizes the system, and the condition can be triggered repeatedly."
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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/memcontrol.c",
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"mm/migrate.c"
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],
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"versions": [
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{
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"version": "9bcef5973e31020e5aa8571eb994d67b77318356",
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"lessThan": "fc7facce686b64201dbf0b9614cc1d0bfad70010",
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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": "9bcef5973e31020e5aa8571eb994d67b77318356",
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"lessThan": "be9581ea8c058d81154251cb0695987098996cad",
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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/memcontrol.c",
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"mm/migrate.c"
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],
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"versions": [
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{
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"version": "6.7",
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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": "6.7",
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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": "6.7",
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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": "6.7",
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"versionEndExcluding": "6.10"
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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/fc7facce686b64201dbf0b9614cc1d0bfad70010"
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},
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{
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"url": "https://git.kernel.org/stable/c/be9581ea8c058d81154251cb0695987098996cad"
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}
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],
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"title": "mm: fix crashes from deferred split racing folio migration",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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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-2024-42234",
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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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],
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"version": "2.0.3",
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"timestamp": "2024-09-10T16:14:10.736603Z"
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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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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-09-11T17:34:32.409Z"
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}
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}
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]
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}
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} |