{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-41051", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-12T12:17:45.626Z", "datePublished": "2024-07-29T14:32:07.577Z", "dateUpdated": "2026-08-05T11:35:01.418Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:35:01.418Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: wait for ondemand_object_worker to finish when dropping object\n\nWhen queuing ondemand_object_worker() to re-open the object,\ncachefiles_object is not pinned. The cachefiles_object may be freed when\nthe pending read request is completed intentionally and the related\nerofs is umounted. If ondemand_object_worker() runs after the object is\nfreed, it will incur use-after-free problem as shown below.\n\nprocess A processs B process C process D\n\ncachefiles_ondemand_send_req()\n// send a read req X\n// wait for its completion\n\n // close ondemand fd\n cachefiles_ondemand_fd_release()\n // set object as CLOSE\n\n cachefiles_ondemand_daemon_read()\n // set object as REOPENING\n queue_work(fscache_wq, &info->ondemand_work)\n\n // close /dev/cachefiles\n cachefiles_daemon_release\n cachefiles_flush_reqs\n complete(&req->done)\n\n// read req X is completed\n// umount the erofs fs\ncachefiles_put_object()\n// object will be freed\ncachefiles_ondemand_deinit_obj_info()\nkmem_cache_free(object)\n // both info and object are freed\n ondemand_object_worker()\n\nWhen dropping an object, it is no longer necessary to reopen the object,\nso use cancel_work_sync() to cancel or wait for ondemand_object_worker()\nto finish." } ], "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 vulnerable path is driven entirely by local filesystem activity — page-cache reads on an erofs-over-fscache mount generating `CACHEFILES_OP_READ` requests, plus the local `/dev/cachefiles` daemon fd and cache-withdrawal lifecycle. No remote peer data reaches `ondemand_object_worker()`.\nAC:L - The attacker supplies the decisive side of the race by keeping a continuous flood of uncached reads in flight on the fscache-backed mount, so a request is essentially always pending on a CLOSE-state object when a drop occurs, and can also saturate `fscache_wq` to widen the window before `ondemand_object_worker()` executes; heap grooming of kmalloc-64 to reclaim the freed `cachefiles_ondemand_info` is likewise fully attacker-controlled and retryable.\nPR:L - Reaching `cachefiles_ondemand_read()` requires only an unprivileged local user with read access to an erofs-over-fscache mount — `cachefiles_prepare_read()` performs no capability check — and the attacker never needs the daemon's CAP_SYS_ADMIN, which belongs to the victim side of the race.\nUI:N - No deliberate victim action is needed; the attacker's own file reads create the pending requests, and object withdrawal is routine automated lifecycle activity (container teardown/umount, daemon restart or crash, cache unbind) rather than a user being tricked into anything.\nS:U - The corruption and all its consequences stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The slab-use-after-free reads `info->object` out of a reclaimed kmalloc-64 allocation and chains dereferences through `object->cookie` and `object->volume`, and `cachefiles_ondemand_init_open_req()` `memcpy()`s from those attacker-redirected pointers into a message that `cachefiles_ondemand_daemon_read()` copies to userspace — an arbitrary kernel-memory read primitive.\nI:H - The freed-object path performs attacker-addressable writes: `cachefiles_ondemand_set_object_close()` stores to `object->ondemand->state`, `wake_up_all(&cache->daemon_pollwq)` does spinlock and list manipulation on a controlled address, and `xas_store()` writes into a forged xarray — sufficient to build a write primitive and escalate privileges.\nA:H - Even without successful heap grooming, `ondemand_object_worker()` dereferences garbage from freed memory in workqueue context (and a still-queued work item leaves the workqueue list pointing into freed slab), producing the slab-use-after-free oops/panic described in the commit." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/cachefiles/ondemand.c" ], "versions": [ { "version": "f17443d52d805c9a7fab5e67a4e8b973626fe1cd", "lessThan": "ec9289369259d982e735a71437e32e6b4035290c", "status": "affected", "versionType": "git" }, { "version": "f740fd943bb1fbf79b7eaba3c71eb7536f437f51", "lessThan": "d3179bae72b1b5e555ba839d6d9f40a350a4d78a", "status": "affected", "versionType": "git" }, { "version": "0a7e54c1959c0feb2de23397ec09c7692364313e", "lessThan": "b26525b2183632f16a3a4108fe6a4bfa8afac6ed", "status": "affected", "versionType": "git" }, { "version": "0a7e54c1959c0feb2de23397ec09c7692364313e", "lessThan": "12e009d60852f7bce0afc373ca0b320f14150418", "status": "affected", "versionType": "git" }, { "version": "6.1.95", "lessThan": "6.1.100", "status": "affected", "versionType": "semver" }, { "version": "6.6.35", "lessThan": "6.6.41", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/cachefiles/ondemand.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.100", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.41", "lessThanOrEqual": "6.6.*", "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": "6.1.95", "versionEndExcluding": "6.1.100" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.35", "versionEndExcluding": "6.6.41" }, { "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/ec9289369259d982e735a71437e32e6b4035290c" }, { "url": "https://git.kernel.org/stable/c/d3179bae72b1b5e555ba839d6d9f40a350a4d78a" }, { "url": "https://git.kernel.org/stable/c/b26525b2183632f16a3a4108fe6a4bfa8afac6ed" }, { "url": "https://git.kernel.org/stable/c/12e009d60852f7bce0afc373ca0b320f14150418" } ], "title": "cachefiles: wait for ondemand_object_worker to finish when dropping object", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/ec9289369259d982e735a71437e32e6b4035290c", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/d3179bae72b1b5e555ba839d6d9f40a350a4d78a", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/b26525b2183632f16a3a4108fe6a4bfa8afac6ed", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/12e009d60852f7bce0afc373ca0b320f14150418", "tags": [ "x_transferred" ] }, { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T21:59:52.818Z" } }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-41051", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T16:22:41.369243Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:01.915Z" } } ] } }