{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-35872", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.108Z", "datePublished": "2024-05-19T08:34:30.096Z", "dateUpdated": "2026-08-05T11:30:33.747Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:30:33.747Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/secretmem.h" ], "versions": [ { "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49", "lessThan": "6564b014af92b677c1f07c44d7f5b595d589cf6e", "status": "affected", "versionType": "git" }, { "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49", "lessThan": "9c2b4b657739ecda38e3b383354a29566955ac48", "status": "affected", "versionType": "git" }, { "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49", "lessThan": "43fad1d0284de30159661d0badfc3cbaf7e6f8f8", "status": "affected", "versionType": "git" }, { "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49", "lessThan": "201e4aaf405dfd1308da54448654053004c579b5", "status": "affected", "versionType": "git" }, { "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49", "lessThan": "65291dcfcf8936e1b23cfd7718fdfde7cfaf7706", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/secretmem.h" ], "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.154", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.85", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.26", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.5", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "5.15.154" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1.85" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.6.26" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.8.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6564b014af92b677c1f07c44d7f5b595d589cf6e" }, { "url": "https://git.kernel.org/stable/c/9c2b4b657739ecda38e3b383354a29566955ac48" }, { "url": "https://git.kernel.org/stable/c/43fad1d0284de30159661d0badfc3cbaf7e6f8f8" }, { "url": "https://git.kernel.org/stable/c/201e4aaf405dfd1308da54448654053004c579b5" }, { "url": "https://git.kernel.org/stable/c/65291dcfcf8936e1b23cfd7718fdfde7cfaf7706" } ], "title": "mm/secretmem: fix GUP-fast succeeding on secretmem folios", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-35872", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": 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