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If this is not true,\nwe will have to revert that commit IMHO.\n\nThis updated version adds \"list_del_init(&rq->queuelist)\" in flush rq\ncallback since the dm layer may submit request of a weird invalid format\n(REQ_FSEQ_PREFLUSH | REQ_FSEQ_POSTFLUSH), which causes double list_add\nif without this \"list_del_init(&rq->queuelist)\". 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But rq->queuelist.next == xxx since\nit's popped out from plug->cached_rq in __blk_mq_alloc_requests_batch().\nWe don't initialize its queuelist just for this first request, although\nthe queuelist of all later popped requests will be initialized.\n\nFix it by changing to use \"list_add_tail(&rq->queuelist, pending)\" so\nrq->queuelist doesn't need to be initialized. It should be ok since rq\ncan't be on any list when PREFLUSH or POSTFLUSH, has no move actually.\n\nPlease note the commit 81ada09cc25e (\"blk-flush: reuse rq queuelist in\nflush state machine\") also has another requirement that no drivers would\ntouch rq->queuelist after blk_mq_end_request() since we will reuse it to\nadd rq to the post-flush pending list in POSTFLUSH. If this is not true,\nwe will have to revert that commit IMHO.\n\nThis updated version adds \"list_del_init(&rq->queuelist)\" in flush rq\ncallback since the dm layer may submit request of a weird invalid format\n(REQ_FSEQ_PREFLUSH | REQ_FSEQ_POSTFLUSH), which causes double list_add\nif without this \"list_del_init(&rq->queuelist)\". The weird invalid format\nproblem should be fixed in dm layer."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bloque: corrige el uso de request.queuelist en Flush Friedrich Weber inform\u00f3 un problema de falla del kernel y lo bisec\u00f3 para el commit 81ada09cc25e (\"blk-flush: reutilizar rq queuelist en la m\u00e1quina de estado de descarga\"). La causa principal es que usamos \"list_move_tail(&rq->queuelist, pendiente)\" en las secuencias PREFLUSH/POSTFLUSH. Pero rq->queuelist.next == xxx ya que sali\u00f3 del plug->cached_rq en __blk_mq_alloc_requests_batch(). No inicializamos su lista de colas solo para esta primera solicitud, aunque se inicializar\u00e1 la lista de colas de todas las solicitudes emergentes posteriores. Solucionelo cambiando para usar \"list_add_tail(&rq->queuelist, pendiente)\" para que no sea necesario inicializar rq->queuelist. Deber\u00eda estar bien ya que rq no puede estar en ninguna lista cuando PREFLUSH o POSTFLUSH, en realidad no tiene movimiento. Tenga en cuenta que el commit 81ada09cc25e (\"blk-flush: reutilizar rq queuelist en la m\u00e1quina de estado de descarga\") tambi\u00e9n tiene otro requisito de que ning\u00fan controlador toque rq->queuelist despu\u00e9s de blk_mq_end_request() ya que lo reutilizaremos para agregar rq al post-flush lista pendiente en POSTFLUSH. Si esto no es cierto, tendremos que revertir ese commit en mi humilde opini\u00f3n. Esta versi\u00f3n actualizada agrega \"list_del_init(&rq->queuelist)\" en la devoluci\u00f3n de llamada de Flush rq ya que la capa dm puede enviar una solicitud de un formato extra\u00f1o no v\u00e1lido (REQ_FSEQ_PREFLUSH | REQ_FSEQ_POSTFLUSH), lo que provoca el doble list_add si no se tiene este \"list_del_init(&rq->queuelist) \". El extra\u00f1o problema del formato no v\u00e1lido deber\u00eda solucionarse en la capa dm."}], "id": "CVE-2024-40925", "lastModified": "2025-09-17T15:15:28.420", "metrics": {"cvssMetricV31": [{"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"}]}, "published": "2024-07-12T13:15:15.343", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/87907bd69721a8506618a954d41a1de3040e88aa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d0321c812d89c5910d8da8e4b10c891c6b96ff70"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fe1e395563ccb051e9dbd8fa99859f5caaad2e71"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/87907bd69721a8506618a954d41a1de3040e88aa"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d0321c812d89c5910d8da8e4b10c891c6b96ff70"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fe1e395563ccb051e9dbd8fa99859f5caaad2e71"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}], "bugzilla": {"description": "kernel: block: fix request.queuelist usage in flush", "id": "2297509", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2297509"}, "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": "verified"}, "cwe": "CWE-665", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nblock: fix request.queuelist usage in flush\nFriedrich Weber reported a kernel crash problem and bisected to commit\n81ada09cc25e (\"blk-flush: reuse rq queuelist in flush state machine\").\nThe root cause is that we use \"list_move_tail(&rq->queuelist, pending)\"\nin the PREFLUSH/POSTFLUSH sequences. But rq->queuelist.next == xxx since\nit's popped out from plug->cached_rq in __blk_mq_alloc_requests_batch().\nWe don't initialize its queuelist just for this first request, although\nthe queuelist of all later popped requests will be initialized.\nFix it by changing to use \"list_add_tail(&rq->queuelist, pending)\" so\nrq->queuelist doesn't need to be initialized. It should be ok since rq\ncan't be on any list when PREFLUSH or POSTFLUSH, has no move actually.\nPlease note the commit 81ada09cc25e (\"blk-flush: reuse rq queuelist in\nflush state machine\") also has another requirement that no drivers would\ntouch rq->queuelist after blk_mq_end_request() since we will reuse it to\nadd rq to the post-flush pending list in POSTFLUSH. If this is not true,\nwe will have to revert that commit IMHO.\nThis updated version adds \"list_del_init(&rq->queuelist)\" in flush rq\ncallback since the dm layer may submit request of a weird invalid format\n(REQ_FSEQ_PREFLUSH | REQ_FSEQ_POSTFLUSH), which causes double list_add\nif without this \"list_del_init(&rq->queuelist)\". The weird invalid format\nproblem should be fixed in dm layer."], "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-2024-40925", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "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-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-07-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-40925\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-40925\nhttps://lore.kernel.org/linux-cve-announce/2024071214-CVE-2024-40925-d411@gregkh/T"], "threat_severity": "Moderate"}

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