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kzalloc(sizeof(*req) + data_len)\n wait_for_completion(&REQ_A->done)\n cachefiles_daemon_read\n cachefiles_ondemand_daemon_read\n // close dev fd\n cachefiles_flush_reqs\n complete(&REQ_A->done)\n kfree(REQ_A)\n xa_lock(&cache->reqs);\n cachefiles_ondemand_select_req\n req->msg.opcode != CACHEFILES_OP_READ\n // req use-after-free !!!\n xa_unlock(&cache->reqs);\n xa_destroy(&cache->reqs)\n\nHence remove requests from cache->reqs when flushing them to avoid\naccessing freed requests."}], "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": "c8383054506c77b814489c09877b5db83fd4abf2", "lessThan": "9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7", "status": "affected", "versionType": "git"}, {"version": "c8383054506c77b814489c09877b5db83fd4abf2", "lessThan": "50d0e55356ba5b84ffb51c42704126124257e598", "status": "affected", 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"programFiles": ["fs/cachefiles/daemon.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.19"}, {"status": "unaffected", "version": "0", "lessThan": "5.19", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.95", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.35", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.9.6", "versionType": "semver", "lessThanOrEqual": "6.9.*"}, {"status": "unaffected", "version": "6.10", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/cachefiles/daemon.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7"}, {"url": "https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598"}, {"url": "https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19"}, {"url": "https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: remove requests from xarray during flushing requests\n\nEven with CACHEFILES_DEAD set, we can still read the requests, so in the\nfollowing concurrency the request may be used after it has been freed:\n\n mount | daemon_thread1 | daemon_thread2\n------------------------------------------------------------\n cachefiles_ondemand_init_object\n cachefiles_ondemand_send_req\n REQ_A = kzalloc(sizeof(*req) + data_len)\n wait_for_completion(&REQ_A->done)\n cachefiles_daemon_read\n cachefiles_ondemand_daemon_read\n // close dev fd\n cachefiles_flush_reqs\n complete(&REQ_A->done)\n kfree(REQ_A)\n xa_lock(&cache->reqs);\n cachefiles_ondemand_select_req\n req->msg.opcode != CACHEFILES_OP_READ\n // req use-after-free !!!\n xa_unlock(&cache->reqs);\n xa_destroy(&cache->reqs)\n\nHence remove requests from cache->reqs when flushing them to avoid\naccessing freed requests."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.95", "versionStartIncluding": "5.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.35", "versionStartIncluding": "5.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.9.6", "versionStartIncluding": "5.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.10", "versionStartIncluding": "5.19"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T09:17:24.646Z"}}}, "cveMetadata": {"cveId": "CVE-2024-40900", "state": "PUBLISHED", "dateUpdated": "2025-05-04T09:17:24.646Z", "dateReserved": "2024-07-12T12:17:45.579Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-07-12T12:20:42.192Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: remove requests from xarray during flushing requests\n\nEven with CACHEFILES_DEAD set, we can still read the requests, so in the\nfollowing concurrency the request may be used after it has been freed:\n\n mount | daemon_thread1 | daemon_thread2\n------------------------------------------------------------\n cachefiles_ondemand_init_object\n cachefiles_ondemand_send_req\n REQ_A = kzalloc(sizeof(*req) + data_len)\n wait_for_completion(&REQ_A->done)\n cachefiles_daemon_read\n cachefiles_ondemand_daemon_read\n // close dev fd\n cachefiles_flush_reqs\n complete(&REQ_A->done)\n kfree(REQ_A)\n xa_lock(&cache->reqs);\n cachefiles_ondemand_select_req\n req->msg.opcode != CACHEFILES_OP_READ\n // req use-after-free !!!\n xa_unlock(&cache->reqs);\n xa_destroy(&cache->reqs)\n\nHence remove requests from cache->reqs when flushing them to avoid\naccessing freed requests."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cachefiles: elimina solicitudes de xarray durante las solicitudes de vaciado Incluso con CACHEFILES_DEAD configurado, a\u00fan podemos leer las solicitudes, por lo que en la siguiente concurrencia la solicitud se puede usar despu\u00e9s de que se haya liberado: mount | daemon_thread1 | daemon_thread2 ------------------------------------------------- --------- Cachefiles_ondemand_init_object Cachefiles_ondemand_send_req req_a = kzalloc (sizeof (*req) + data_len) Wait_for_completion (& req_a-> ded) gratis (req_a ) xa_lock(&cache->reqs); cachefiles_ondemand_select_req req->msg.opcode != CACHEFILES_OP_READ // \u00a1\u00a1\u00a1requiere use-after-free !!! xa_unlock(&cache->reqs); xa_destroy(&cache->reqs) Por lo tanto, elimine las solicitudes de cache->reqs cuando las vac\u00ede para evitar acceder a las solicitudes liberadas."}], "id": "CVE-2024-40900", "lastModified": "2024-11-21T09:31:49.010", "metrics": {}, "published": "2024-07-12T13:15:13.433", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: cachefiles: remove requests from xarray during flushing requests", "id": "2297484", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2297484"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncachefiles: remove requests from xarray during flushing requests\nEven with CACHEFILES_DEAD set, we can still read the requests, so in the\nfollowing concurrency the request may be used after it has been freed:\nmount | daemon_thread1 | daemon_thread2\n------------------------------------------------------------\ncachefiles_ondemand_init_object\ncachefiles_ondemand_send_req\nREQ_A = kzalloc(sizeof(*req) + data_len)\nwait_for_completion(&REQ_A->done)\ncachefiles_daemon_read\ncachefiles_ondemand_daemon_read\n// close dev fd\ncachefiles_flush_reqs\ncomplete(&REQ_A->done)\nkfree(REQ_A)\nxa_lock(&cache->reqs);\ncachefiles_ondemand_select_req\nreq->msg.opcode != CACHEFILES_OP_READ\n// req use-after-free !!!\nxa_unlock(&cache->reqs);\nxa_destroy(&cache->reqs)\nHence remove requests from cache->reqs when flushing them to avoid\naccessing freed requests."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-40900", "package_state": [{"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": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-07-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-40900\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-40900\nhttps://lore.kernel.org/linux-cve-announce/2024071207-CVE-2024-40900-7497@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:31:36.506919+00:00", "updated": "2025-07-12T22:31:36.506984+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}