{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-26630", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.135Z", "datePublished": "2024-03-13T15:50:32.480Z", "dateUpdated": "2026-08-05T11:26:23.659Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:26:23.659Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: cachestat: fix folio read-after-free in cache walk\n\nIn cachestat, we access the folio from the page cache's xarray to compute\nits page offset, and check for its dirty and writeback flags. However, we\ndo not hold a reference to the folio before performing these actions,\nwhich means the folio can concurrently be released and reused as another\nfolio/page/slab.\n\nGet around this altogether by just using xarray's existing machinery for\nthe folio page offsets and dirty/writeback states.\n\nThis changes behavior for tmpfs files to now always report zeroes in their\ndirty and writeback counters. This is okay as tmpfs doesn't follow\nconventional writeback cache behavior: its pages get \"cleaned\" during\nswapout, after which they're no longer resident etc." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerability is reached only through the local `cachestat(2)` system call on an open file descriptor. There is no remote or adjacent-network path to `filemap_cachestat()`.\nAC:L - Although this is a race, the attacker drives both sides of it: one thread loops on `cachestat()` while another loops `POSIX_FADV_DONTNEED`/truncate on a file it owns (e.g. a memfd) plus a slab-spray thread, so the window is created and retried at will with no dependence on conditions outside the attacker's control.\nPR:L - The syscall performs no capability or permission check beyond `fdget()` — any unprivileged local user with any open file descriptor can call it, and `CONFIG_CACHESTAT_SYSCALL` is `default y` in stock kernels.\nUI:N - The attacker's own processes populate the page cache, evict it, and call the syscall; no victim action is needed at any point.\nS:U - The read-after-free occurs in kernel memory and the disclosed data is returned to the calling process within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Reading the freed-and-reused `struct page` leaks stale metadata whose reuse the attacker can groom, and the pointer-sized `folio->index` value (SLUB's `slab.freelist`) is recoverable exactly from the returned `nr_cache` counter, giving repeatable full kernel-heap address disclosure and KASLR defeat.\nI:N - Every access to the freed folio on this path is a read; the results are accumulated into a stack `struct cachestat` copied to the caller's own buffer, so no kernel memory is modified and no write primitive is created.\nA:H - This is a use-after-free, which crashes even when not exploited: a stale `PG_head` bit sends the read to `page[1]`, which can fault on an unpopulated vmemmap section on memory-hole/hotplug systems, and KASAN-instrumented kernels panic on the UAF report." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/filemap.c" ], "versions": [ { "version": "cf264e1329fb0307e044f7675849f9f38b44c11a", "lessThan": "ba60fdf75e89ea762bb617be578dc47f27655117", "status": "affected", "versionType": "git" }, { "version": "cf264e1329fb0307e044f7675849f9f38b44c11a", "lessThan": "fe7e008e0ce728252e4ec652cceebcc62211657c", "status": "affected", "versionType": "git" }, { "version": "cf264e1329fb0307e044f7675849f9f38b44c11a", "lessThan": "3a75cb05d53f4a6823a32deb078de1366954a804", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/filemap.c" ], "versions": [ { "version": "6.5", "status": "affected" }, { "version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.21", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.9", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "6.5", "versionEndExcluding": "6.6.21" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.7.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ba60fdf75e89ea762bb617be578dc47f27655117" }, { "url": "https://git.kernel.org/stable/c/fe7e008e0ce728252e4ec652cceebcc62211657c" }, { "url": "https://git.kernel.org/stable/c/3a75cb05d53f4a6823a32deb078de1366954a804" } ], "title": "mm: cachestat: fix folio read-after-free in cache walk", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-26630", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-03-13T19:45:46.313433Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:49:39.851Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:07:19.749Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/ba60fdf75e89ea762bb617be578dc47f27655117", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/fe7e008e0ce728252e4ec652cceebcc62211657c", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/3a75cb05d53f4a6823a32deb078de1366954a804", "tags": [ "x_transferred" ] } ] } ] } }