275 lines
15 KiB
JSON
275 lines
15 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-2024-35872",
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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": "2024-05-17T13:50:33.108Z",
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"datePublished": "2024-05-19T08:34:30.096Z",
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"dateUpdated": "2026-08-05T11:30:33.747Z"
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},
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:30:33.747Z"
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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/secretmem: fix GUP-fast succeeding on secretmem folios\n\nfolio_is_secretmem() currently relies on secretmem folios being LRU\nfolios, to save some cycles.\n\nHowever, folios might reside in a folio batch without the LRU flag set, or\ntemporarily have their LRU flag cleared. Consequently, the LRU flag is\nunreliable for this purpose.\n\nIn particular, this is the case when secretmem_fault() allocates a fresh\npage and calls filemap_add_folio()->folio_add_lru(). The folio might be\nadded to the per-cpu folio batch and won't get the LRU flag set until the\nbatch was drained using e.g., lru_add_drain().\n\nConsequently, folio_is_secretmem() might not detect secretmem folios and\nGUP-fast can succeed in grabbing a secretmem folio, crashing the kernel\nwhen we would later try reading/writing to the folio, because the folio\nhas been unmapped from the directmap.\n\nFix it by removing that unreliable check."
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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 whole path is local syscalls — `memfd_secret(2)`, `mmap(2)` to fault the folio into the per-CPU batch, then any GUP-fast consumer such as `vmsplice(2)`, O_DIRECT, or io_uring buffer registration. No remote peer data reaches `folio_is_secretmem()`.\nAC:L - The window is not a race the attacker must win but a state the attacker creates: faulting a fresh secretmem page deterministically leaves it in the per-CPU folio batch without `PG_lru`, and the immediately following GUP-fast call on the same CPU always sees the stale flag — the upstream selftest reproduces it every run, with unlimited retries available.\nPR:L - Only an unprivileged local account is needed: `memfd_secret(2)` performs no capability check, `CONFIG_SECRETMEM` is `default y` on x86/arm64/riscv, and `secretmem.enable` defaults to 1 since v6.5, with `secretmem_mmap()` needing only default RLIMIT_MEMLOCK headroom for a single page.\nUI:N - The attacking process performs every step itself — create the fd, fault the page, invoke the GUP-fast consumer. No victim action, mount, or file open is involved.\nS:U - The bypassed check and the resulting oops/exposure are both inside the kernel's own memory-management authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - It defeats secretmem's core confidentiality guarantee — pages deliberately removed from the kernel direct map become pinnable and reachable by kernel subsystems and DMA engines (splice→socket, O_DIRECT, and even read-only longterm pins passed in the vulnerable tree), so key material secretmem exists to keep out of kernel reach can be read out to a file or the wire, and the resulting oops additionally dumps kernel addresses and stack state.\nI:H - The same bypass works with `FOLL_WRITE`, letting kernel copies and device DMA write into memory the design guarantees is unwritable from kernel context and corrupt the protected secret; the unhandled kernel fault also aborts operations mid-way, leaving pinned folios and held mm/pipe/filesystem locks behind.\nA:H - Any subsequent CPU access to the pinned folio through the cleared direct-map entry is an unhandled kernel page fault — `page_fault_oops()` in process context, and a fatal `Fatal exception in interrupt` panic when it lands in softirq (e.g. skb copy after splice to a socket) — and an unprivileged user can trigger it on demand and 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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"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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"include/linux/secretmem.h"
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"version": "5.14",
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"version": "0",
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