CVE-2024-38556

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The reported trigger (CREATE_UCTX from a userspace pid) is a local ioctl path.\nAC:L - The attacker controls both sides: they flood the command interface to keep all max_reg_cmds slots occupied (a saturation mode mlx5 maintainers explicitly documented for unprivileged/high-rate command issuers) while issuing the victim blocking command that parks on the semaphore, and each resulting timeout permanently leaks a slot, making the exhausted-semaphore state self-reinforcing and eventually deterministic.\nPR:L - An unprivileged local user with access to /dev/infiniband/uverbs* (mode 0666 under stock rdma-core udev rules on RDMA-enabled hosts) can issue the exact CREATE_UCTX command from the report via ALLOC_UCONTEXT with MLX5_IB_ALLOC_UCTX_DEVX, with no capability check on that path.\nUI:N - Exploitation requires only the attacker's own syscalls/ioctls against the RDMA device; no action by any other user or administrator is needed.\nS:U - The use-after-free and its consequences are confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed mlx5_cmd_work_ent is reused by the still-parked work handler, which reads ent->in/ent->out/ent->uout pointers out of reclaimed heap memory and copies FW output through them, giving an attacker who sprays the freed slot a read primitive into kernel memory.\nI:H - The parked handler writes ent->idx, ent->lay and ent->ts1 into freed memory, installs a dangling pointer in cmd->ent_arr[] that a later FW completion dereferences to call ent->callback(err, context) \u2014 a function pointer taken from sprayable freed memory \u2014 and programs DMA addresses read from freed memory into the NIC command descriptor before ringing the doorbell.\nA:H - The bug produces stuck commands, permanently leaked command-queue slots that eventually wedge the entire firmware command interface (rendering the NIC unconfigurable), plus a use-after-free that reliably causes oops/panic even when not fully 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"F5EDD0D5-6B6E-4F6A-A099-30679CC81755", "versionEndIncluding": "6.8.12", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9A21A3C2-C96F-4722-B347-C34D308A1B12", "versionEndIncluding": "6.9.3", "versionStartIncluding": "6.9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: Add a timeout to acquire the command queue semaphore\n\nPrevent forced completion handling on an entry that has not yet been\nassigned an index, causing an out of bounds access on idx = -22.\nInstead of waiting indefinitely for the sem, blocking flow now waits for\nindex to be allocated or a sem acquisition timeout before beginning the\ntimer for FW completion.\n\nKernel log example:\nmlx5_core 0000:06:00.0: wait_func_handle_exec_timeout:1128:(pid 185911): cmd[-22]: CREATE_UCTX(0xa04) No done completion"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/mlx5: agrega un tiempo de espera para adquirir el sem\u00e1foro de la cola de comandos. Evita el manejo de finalizaci\u00f3n forzada en una entrada a la que a\u00fan no se le ha asignado un \u00edndice, lo que provoca un acceso fuera de los l\u00edmites en idx = -22. En lugar de esperar indefinidamente el sem, el flujo de bloqueo ahora espera a que se asigne el \u00edndice o a que se agote el tiempo de espera de adquisici\u00f3n del sem antes de iniciar el temporizador para completar el FW. Ejemplo de registro del kernel: mlx5_core 0000:06:00.0: wait_func_handle_exec_timeout:1128:(pid 185911): cmd[-22]: CREATE_UCTX(0xa04) No se complet\u00f3"}], "id": "CVE-2024-38556", "lastModified": "2026-08-04T11:18:43.907", "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": 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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-38556", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-21T14:39:36.786296Z", "version": "2.0.3"}}]}, "published": "2024-06-19T14:15:15.810", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2d0962d05c93de391ce85f6e764df895f47c8918"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/485d65e1357123a697c591a5aeb773994b247ad7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4baae687a20ef2b82fde12de3c04461e6f2521d6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94024332a129c6e4275569d85c0c1bfb2ae2d71b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f9caccdd42e999b74303c9b0643300073ed5d319"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2d0962d05c93de391ce85f6e764df895f47c8918"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/485d65e1357123a697c591a5aeb773994b247ad7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4baae687a20ef2b82fde12de3c04461e6f2521d6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94024332a129c6e4275569d85c0c1bfb2ae2d71b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f9caccdd42e999b74303c9b0643300073ed5d319"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-129"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:8162", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.40.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-10-16T00:00:00Z"}, {"advisory": "RHSA-2024:8162", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.40.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-10-16T00:00:00Z"}, {"advisory": "RHSA-2024:5364", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "kernel-0:5.14.0-284.79.1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-08-14T00:00:00Z"}, {"advisory": "RHSA-2024:5365", "cpe": "cpe:/a:redhat:rhel_eus:9.2::nfv", "package": "kernel-rt-0:5.14.0-284.79.1.rt14.364.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-08-14T00:00:00Z"}], "bugzilla": {"description": "kernel: net/mlx5: Add a timeout to acquire the command queue semaphore", "id": "2293443", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293443"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/mlx5: Add a timeout to acquire the command queue semaphore\nPrevent forced completion handling on an entry that has not yet been\nassigned an index, causing an out of bounds access on idx = -22.\nInstead of waiting indefinitely for the sem, blocking flow now waits for\nindex to be allocated or a sem acquisition timeout before beginning the\ntimer for FW completion.\nKernel log example:\nmlx5_core 0000:06:00.0: wait_func_handle_exec_timeout:1128:(pid 185911): cmd[-22]: CREATE_UCTX(0xa04) No done completion"], "name": "CVE-2024-38556", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-06-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-38556\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-38556\nhttps://lore.kernel.org/linux-cve-announce/2024061952-CVE-2024-38556-8afa@gregkh/T"], "threat_severity": "Low"}

{}