CVE-2024-42250

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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 \u2014 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 \u2014 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 \u2014 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 \u2014 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"}}]}}

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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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: archivos de cach\u00e9: agregue protecci\u00f3n de bloqueo faltante al sondear. Agregue protecci\u00f3n de bloqueo faltante en la rutina de sondeo al iterar xarray; de lo contrario: incluso con el bloqueo de lectura de RCU mantenido, solo se garantiza que la ranura del \u00e1rbol de base ser anclado all\u00ed, mientras que la estructura de datos (por ejemplo, struct cachefiles_req) almacenada en la ranura no tiene tal garant\u00eda. La rutina de sondeo iterar\u00e1 el \u00e1rbol de base y eliminar\u00e1 la referencia a cachefiles_req en consecuencia. Por lo tanto, el bloqueo de lectura de la RCU no es adecuado en este caso y aqu\u00ed se necesita el bloqueo de giro."}], "id": "CVE-2024-42250", "lastModified": "2026-08-04T11:19:42.000", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-42250", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T16:13:18.948935Z", "version": "2.0.3"}}]}, "published": "2024-08-07T16:15:47.567", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6bb6bd3dd6f382dfd36220d4b210a0c77c066651"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8eadcab7f3dd809edbe5ae20533ff843dfea3a07"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/97cfd5e20ddc2e33e16ce369626ce76c9a475fd7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cf5bb09e742a9cf6349127e868329a8f69b7a014"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: cachefiles: add missing lock protection when polling", "id": "2303518", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2303518"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-667", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncachefiles: add missing lock protection when polling\nAdd missing lock protection in poll routine when iterating xarray,\notherwise:\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.", "A flaw was found in the cachefiles module in the Linux kernel. An improper locking protection in the cachefiles_daemon_poll function in the fs/cachefiles/daemon.c file can result in a race condition."], "name": "CVE-2024-42250", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-08-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-42250\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-42250\nhttps://lore.kernel.org/linux-cve-announce/2024080743-CVE-2024-42250-9580@gregkh/T"], "statement": "The kernel, as shipped in Red Hat Enterprise Linux 8 and 9, is not affected by this vulnerability because the vulnerable code is not present.", "threat_severity": "Moderate"}

{}