{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-38556", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-18T19:36:34.921Z", "datePublished": "2024-06-19T13:35:26.753Z", "dateUpdated": "2026-08-05T11:32:46.140Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:32:46.140Z" }, "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" } ], "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 mlx5 firmware command interface is driven by local callers — RDMA uverbs/DEVX ioctls on /dev/infiniband/uverbs*, netdev/ethtool/devlink ops — not by received network packets. 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) — a function pointer taken from sprayable freed memory — 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 exploited." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/mellanox/mlx5/core/cmd.c", "include/linux/mlx5/driver.h" ], "versions": [ { "version": "8e715cd613a1e872b9d918e912d90b399785761a", "lessThan": "4baae687a20ef2b82fde12de3c04461e6f2521d6", "status": "affected", "versionType": "git" }, { "version": "8e715cd613a1e872b9d918e912d90b399785761a", "lessThan": "f9caccdd42e999b74303c9b0643300073ed5d319", "status": "affected", "versionType": "git" }, { "version": "8e715cd613a1e872b9d918e912d90b399785761a", "lessThan": "2d0962d05c93de391ce85f6e764df895f47c8918", "status": "affected", "versionType": "git" }, { "version": "8e715cd613a1e872b9d918e912d90b399785761a", "lessThan": "94024332a129c6e4275569d85c0c1bfb2ae2d71b", "status": "affected", "versionType": "git" }, { "version": "8e715cd613a1e872b9d918e912d90b399785761a", "lessThan": "485d65e1357123a697c591a5aeb773994b247ad7", "status": "affected", "versionType": "git" }, { "version": "74dd45122b84479eee50bd0956ae8bc5799c9f8a", "status": "affected", "versionType": "git" }, { "version": "e801f81cee3c8901f52ee48c6329802b28fbb49c", "status": "affected", "versionType": "git" }, { "version": "d73d81447c6651904dd4a9e3fd88651ff174c1b7", "status": "affected", "versionType": "git" }, { "version": "4646175c19fd019b773444a11ff62748eb83745b", "status": "affected", "versionType": "git" }, { "version": "5.4.174", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "5.10.94", "lessThan": "5.11", "status": "affected", "versionType": "semver" }, { "version": "5.15.17", "lessThan": "5.16", "status": "affected", "versionType": "semver" }, { "version": "5.16.3", "lessThan": "5.17", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/mellanox/mlx5/core/cmd.c", "include/linux/mlx5/driver.h" ], "versions": [ { "version": "5.17", "status": "affected" }, { "version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.93", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.33", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.12", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.3", "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": 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