CVE-2024-38555 (GCVE-0-2024-38555)
Vulnerability from cvelistv5
Published
2024-06-19 13:35
Modified
2026-08-05 11:32
Severity ?
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Discard command completions in internal error Fix use after free when FW completion arrives while device is in internal error state. Avoid calling completion handler in this case, since the device will flush the command interface and trigger all completions manually. Kernel log: ------------[ cut here ]------------ refcount_t: underflow; use-after-free. ... RIP: 0010:refcount_warn_saturate+0xd8/0xe0 ... Call Trace: <IRQ> ? __warn+0x79/0x120 ? refcount_warn_saturate+0xd8/0xe0 ? report_bug+0x17c/0x190 ? handle_bug+0x3c/0x60 ? exc_invalid_op+0x14/0x70 ? asm_exc_invalid_op+0x16/0x20 ? refcount_warn_saturate+0xd8/0xe0 cmd_ent_put+0x13b/0x160 [mlx5_core] mlx5_cmd_comp_handler+0x5f9/0x670 [mlx5_core] cmd_comp_notifier+0x1f/0x30 [mlx5_core] notifier_call_chain+0x35/0xb0 atomic_notifier_call_chain+0x16/0x20 mlx5_eq_async_int+0xf6/0x290 [mlx5_core] notifier_call_chain+0x35/0xb0 atomic_notifier_call_chain+0x16/0x20 irq_int_handler+0x19/0x30 [mlx5_core] __handle_irq_event_percpu+0x4b/0x160 handle_irq_event+0x2e/0x80 handle_edge_irq+0x98/0x230 __common_interrupt+0x3b/0xa0 common_interrupt+0x7b/0xa0 </IRQ> <TASK> asm_common_interrupt+0x22/0x40
References
Impacted products
Vendor Product Version
Linux Linux Version: 27c79b3a9212cf4ba634c157e07d29548181a208
Version: 51d138c2610a236c1ed0059d034ee4c74f452b86
Version: 51d138c2610a236c1ed0059d034ee4c74f452b86
Version: 51d138c2610a236c1ed0059d034ee4c74f452b86
Version: 51d138c2610a236c1ed0059d034ee4c74f452b86
Version: 51d138c2610a236c1ed0059d034ee4c74f452b86
Version: 51d138c2610a236c1ed0059d034ee4c74f452b86
Version: 2e5d24b3bf091802c5456dc8f8f6a6be4493c8ca
Version: 5.10.20   ≤
Version: 5.11.3   ≤
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              "value": "AV:L - The vulnerable code is the mlx5 PCI command/EQ interface; it is driven by locally issued firmware commands (RDMA uverbs, netdev/flow configuration) and the device health path, not by any remotely supplied data. No network packet reaches `cmd_comp_notifier()`.\nAC:H - Exploitation requires the device to be in `MLX5_DEVICE_STATE_INTERNAL_ERROR` \u2014 set only by a fatal FW syndrome, a PCI/AER error, or an admin-initiated FW sync reset \u2014 and a real FW completion must land in the window during/after `mlx5_cmd_flush()`; the attacker can flood the command queue to widen the window but cannot induce the error transition itself.\nPR:L - An unprivileged local user can supply the attacker-controlled half \u2014 keeping firmware commands in flight via the RDMA character device (commonly mode 0666 under rdma-core udev rules) and spraying `kmalloc-512` to reoccupy the freed `mlx5_cmd_work_ent`. No capability is needed for those operations.\nUI:N - The double `cmd_ent_put()` fires from the async EQ interrupt handler with no victim action involved; the attacker only needs to have commands outstanding when the device faults.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - After the entry is freed, `ent-\u003eout`, `ent-\u003elay` and `ent-\u003euout` are read from reallocated memory and `mlx5_copy_from_msg()` copies firmware response data through those attacker-groomable pointers, giving an arbitrary kernel read/disclosure primitive.\nI:H - The stale completion path performs `callback(err, context)` \u2014 an indirect call through a function pointer read out of freed memory \u2014 plus writes via `ent-\u003eout`/`ent-\u003euout` and `mlx5_free_cmd_msg()`/`free_msg()` on freed pointers, yielding arbitrary write and control-flow hijack primitives.\nA:H - The reported symptom is a `refcount_t: underflow; use-after-free` WARN in hard-IRQ context (fatal under panic_on_warn); the extra put also frees a live command entry and corrupts the command-slot bitmask and semaphore, leading to oops/panic and a wedged command interface."
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\"https://git.kernel.org/stable/c/bf8aaf0ae01c27ae3c06aa8610caf91e50393396\"}, {\"url\": \"https://git.kernel.org/stable/c/1337ec94bc5a9eed250e33f5f5c89a28a6bfabdb\"}, {\"url\": \"https://git.kernel.org/stable/c/1d5dce5e92a70274de67a59e1e674c3267f94cd7\"}, {\"url\": \"https://git.kernel.org/stable/c/7ac4c69c34240c6de820492c0a28a0bd1494265a\"}, {\"url\": \"https://git.kernel.org/stable/c/db9b31aa9bc56ff0d15b78f7e827d61c4a096e40\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/mlx5: Discard command completions in internal error\\n\\nFix use after free when FW completion arrives while device is in\\ninternal error state. Avoid calling completion handler in this case,\\nsince the device will flush the command interface and trigger all\\ncompletions manually.\\n\\nKernel log:\\n------------[ cut here ]------------\\nrefcount_t: underflow; use-after-free.\\n...\\nRIP: 0010:refcount_warn_saturate+0xd8/0xe0\\n...\\nCall Trace:\\n\u003cIRQ\u003e\\n? __warn+0x79/0x120\\n? refcount_warn_saturate+0xd8/0xe0\\n? report_bug+0x17c/0x190\\n? handle_bug+0x3c/0x60\\n? exc_invalid_op+0x14/0x70\\n? asm_exc_invalid_op+0x16/0x20\\n? refcount_warn_saturate+0xd8/0xe0\\ncmd_ent_put+0x13b/0x160 [mlx5_core]\\nmlx5_cmd_comp_handler+0x5f9/0x670 [mlx5_core]\\ncmd_comp_notifier+0x1f/0x30 [mlx5_core]\\nnotifier_call_chain+0x35/0xb0\\natomic_notifier_call_chain+0x16/0x20\\nmlx5_eq_async_int+0xf6/0x290 [mlx5_core]\\nnotifier_call_chain+0x35/0xb0\\natomic_notifier_call_chain+0x16/0x20\\nirq_int_handler+0x19/0x30 [mlx5_core]\\n__handle_irq_event_percpu+0x4b/0x160\\nhandle_irq_event+0x2e/0x80\\nhandle_edge_irq+0x98/0x230\\n__common_interrupt+0x3b/0xa0\\ncommon_interrupt+0x7b/0xa0\\n\u003c/IRQ\u003e\\n\u003cTASK\u003e\\nasm_common_interrupt+0x22/0x40\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.219\", \"versionStartIncluding\": \"5.10.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.161\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.93\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.33\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.12\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.3\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.11.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:48:40.659Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-38555\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:48:40.659Z\", \"dateReserved\": \"2024-06-18T19:36:34.920Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-19T13:35:26.059Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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