{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-42250", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-30T07:40:12.256Z", "datePublished": "2024-08-07T15:14:33.997Z", "dateUpdated": "2026-08-05T11:36:04.678Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:36:04.678Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: add missing lock protection when polling\n\nAdd missing lock protection in poll routine when iterating xarray,\notherwise:\n\nEven with RCU read lock held, only the slot of the radix tree is\nensured to be pinned there, while the data structure (e.g. struct\ncachefiles_req) stored in the slot has no such guarantee. The poll\nroutine will iterate the radix tree and dereference cachefiles_req\naccordingly. Thus RCU read lock is not adequate in this case and\nspinlock is needed here." } ], "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 race is driven through local file I/O on an EROFS-over-fscache on-demand mount and the local `/dev/cachefiles` daemon interface; no network-supplied data reaches the vulnerable poll iterator.\nAC:L - The attacker creates both sides of the race — each cache-miss read allocates a request and calls `wake_up_all(&cache->daemon_pollwq)`, forcing the daemon into the unlocked xarray walk, and the same task performs the `kfree(req)` on completion — and can retry indefinitely while heap-spraying the freed slab.\nPR:L - An unprivileged local user or container tenant only needs read access to files on the already-mounted on-demand cache; the CAP_SYS_ADMIN-held daemon fd is a normal running service in these deployments, not something the attacker must obtain.\nUI:N - No victim action is required — the cachefiles daemon polls continuously as part of its normal operation and is woken automatically by the attacker's own request submissions.\nS:U - The use-after-free occurs in kernel memory and its impact stays within the kernel's security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - `req->object` is at offset 0 of the freed object, so a reallocated/sprayed slab yields an attacker-chosen pointer that is dereferenced twice, and the resulting `state` comparison is leaked back as the EPOLLIN bit — a repeatable arbitrary-address read oracle.\nI:H - A slab use-after-free with a fully attacker-controllable first-field pointer is a classic primitive for heap grooming and control-flow/data corruption, so integrity impact is High per use-after-free handling.\nA:H - Dereferencing the stale or wild `req->object` chain reliably produces a kernel oops/panic, taking down the host or container node." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/cachefiles/daemon.c" ], "versions": [ { "version": "0e19a18f998dcabe8be590e0b39660a1f230209b", "lessThan": "97cfd5e20ddc2e33e16ce369626ce76c9a475fd7", "status": "affected", "versionType": "git" }, { "version": "18943864342705fa18dd4e6b8d608491fec81f6e", "lessThan": "6bb6bd3dd6f382dfd36220d4b210a0c77c066651", "status": "affected", "versionType": "git" }, { "version": "b817e22b2e91257ace32a6768c3c003faeaa1c5c", "lessThan": "8eadcab7f3dd809edbe5ae20533ff843dfea3a07", "status": "affected", "versionType": "git" }, { "version": "b817e22b2e91257ace32a6768c3c003faeaa1c5c", "lessThan": "cf5bb09e742a9cf6349127e868329a8f69b7a014", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/cachefiles/daemon.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.10", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "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": "6.8", "versionEndExcluding": "6.9.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/97cfd5e20ddc2e33e16ce369626ce76c9a475fd7" }, { "url": "https://git.kernel.org/stable/c/6bb6bd3dd6f382dfd36220d4b210a0c77c066651" }, { "url": "https://git.kernel.org/stable/c/8eadcab7f3dd809edbe5ae20533ff843dfea3a07" }, { "url": "https://git.kernel.org/stable/c/cf5bb09e742a9cf6349127e868329a8f69b7a014" } ], "title": "cachefiles: add missing lock protection when polling", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-42250", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T16:13:18.948935Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:34:30.655Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:02:51.030Z" } } ] } }