CVE-2024-46737

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A remote initiator anywhere on the network triggers it with ordinary NVMe/TCP protocol traffic.\nAC:L - The attacker deterministically forces the allocation failure by setting `sqsize` in the admin Connect command, which since commit 143667ee9a9c is unbounded for qid 0, making `kcalloc(131072, sizeof(struct nvmet_tcp_cmd))` exceed MAX_PAGE_ORDER and return NULL every time; on older branches the same is achieved with parallel max-size connections. No race, no memory-layout condition, and no state outside the attacker's control is involved.\nPR:N - `nvmet_install_queue()` runs inside the admin Connect handler before any DH-HMAC-CHAP authentication exchange, and `nvmet_host_allowed()` returns true unconditionally for the discovery subsystem exposed by every nvmet-tcp port. An entirely unauthenticated remote peer with TCP reachability can drive the path.\nUI:N - The crash is triggered purely by attacker-sent NVMe/TCP capsules followed by closing the connection. No action by any local user or administrator is required.\nS:U - The NULL dereference occurs in a kernel workqueue context and its impact is confined to the kernel on the target host, with no crossing into another security authority such as a hypervisor or IOMMU boundary.\nC:N - The fault is a read of `cmd->req.cmd` at fixed address NULL+0x8 that oopses on the very first loop iteration; a remote TCP peer has no means to map the zero page, so no kernel data is read back or disclosed to the attacker.\nI:N - Execution stops at the faulting read before reaching the later `nvmet_tcp_free_cmd_buffers()` stores, and the dereferenced address is a fixed unmapped low address rather than attacker-controlled memory, so nothing is modified or corrupted.\nA:H - The result is a kernel NULL pointer dereference oops in the `nvmet_tcp_wq` kworker \u2014 a full panic on systems with `panic_on_oops` \u2014 repeatable at will by an unauthenticated remote attacker, and each attempt additionally leaks the queue allocation, socket file reference and IDA index."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/nvme/target/tcp.c"], "versions": [{"version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": "03e1fd0327fa5e2174567f5fe9290fe21d21b8f4", "status": "affected", "versionType": "git"}, {"version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": "50632b877ce55356f5d276b9add289b1e7ddc683", "status": "affected", "versionType": "git"}, {"version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": "91dad30c5607e62864f888e735d0965567827bdf", "status": "affected", "versionType": "git"}, {"version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": "7957c731fc2b23312f8935812dee5a0b14b04e2d", "status": "affected", "versionType": "git"}, {"version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": 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"https://git.kernel.org/stable/c/489f2913a63f528cfe3f21722583fb981967ecda"}, {"url": "https://git.kernel.org/stable/c/6c04d1e3ab22cc5394ef656429638a5947f87244"}, {"url": "https://git.kernel.org/stable/c/5572a55a6f830ee3f3a994b6b962a5c327d28cb3"}], "title": "nvmet-tcp: fix kernel crash if commands allocation fails", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-09-29T14:52:30.516681Z", "id": "CVE-2024-46737", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-29T14:52:46.426Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}, {"url": 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NULL pointer dereference.\n\n nvmet: failed to install queue 0 cntlid 1 ret 6\n Unable to handle kernel NULL pointer dereference at\n virtual address 0000000000000008\n\nFix the bug by setting queue->nr_cmds to zero in case\nnvmet_tcp_alloc_cmd() fails."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nvmet-tcp: corrige el fallo del kernel si falla la asignaci\u00f3n de comandos Si la asignaci\u00f3n de comandos falla en nvmet_tcp_alloc_cmds(), el kernel se bloquea en nvmet_tcp_release_queue_work() debido a una desreferencia de puntero NULL. nvmet: no se pudo instalar la cola 0 cntlid 1 ret 6 No se puede manejar la desreferencia de puntero NULL del kernel en la direcci\u00f3n virtual 000000000000008 Corrija el error estableciendo queue->nr_cmds en cero en caso de que nvmet_tcp_alloc_cmd() falle."}], "id": "CVE-2024-46737", "lastModified": "2026-08-04T11:20:19.770", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "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-2024-46737", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-29T14:52:30.516681Z", "version": "2.0.3"}}]}, "published": "2024-09-18T08:15:03.167", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/03e1fd0327fa5e2174567f5fe9290fe21d21b8f4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/489f2913a63f528cfe3f21722583fb981967ecda"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/50632b877ce55356f5d276b9add289b1e7ddc683"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5572a55a6f830ee3f3a994b6b962a5c327d28cb3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6c04d1e3ab22cc5394ef656429638a5947f87244"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7957c731fc2b23312f8935812dee5a0b14b04e2d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/91dad30c5607e62864f888e735d0965567827bdf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"}, {"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-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: nvmet-tcp: fix kernel crash if commands allocation fails", "id": "2313085", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2313085"}, "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-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnvmet-tcp: fix kernel crash if commands allocation fails\nIf the commands allocation fails in nvmet_tcp_alloc_cmds()\nthe kernel crashes in nvmet_tcp_release_queue_work() because of\na NULL pointer dereference.\nnvmet: failed to install queue 0 cntlid 1 ret 6\nUnable to handle kernel NULL pointer dereference at\nvirtual address 0000000000000008\nFix the bug by setting queue->nr_cmds to zero in case\nnvmet_tcp_alloc_cmd() fails."], "name": "CVE-2024-46737", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "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": "2024-09-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-46737\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-46737\nhttps://lore.kernel.org/linux-cve-announce/2024091833-CVE-2024-46737-d36f@gregkh/T"], "threat_severity": "Moderate"}

{}