408 lines
20 KiB
JSON
408 lines
20 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveId": "CVE-2024-26664",
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"dateReserved": "2024-02-19T14:20:24.148Z",
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"datePublished": "2024-04-02T06:22:13.341Z",
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"dateUpdated": "2026-08-05T11:26:38.879Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (coretemp) Fix out-of-bounds memory access\n\nFix a bug that pdata->cpu_map[] is set before out-of-bounds check.\nThe problem might be triggered on systems with more than 128 cores per\npackage."
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"value": "AV:L - `create_core_data()` is only reachable through the coretemp CPU-hotplug callback (`coretemp_cpu_online()`), exercised at module load/boot and on local `/sys/devices/system/cpu/cpuN/online` writes. There is no network, adjacent-network, or removable-device path into this hwmon driver.\nAC:L - On an affected target (an Intel package with more than 128 cores, e.g. 144-core Sierra Forest sockets) the out-of-bounds write is fully deterministic — it fires on every boot and on every CPU-online cycle once the IDA index passes 127, with no race, no grooming, and no per-attempt uncertainty. Target-configuration/hardware dependence is not AC:H under CVSS 3.1.\nPR:L - The driver performs no capability or credential check anywhere on the `coretemp_cpu_online()` → `coretemp_add_core()` → `create_core_data()` path; the corruption occurs during ordinary CPU bring-up with no privilege held at all, and the runtime re-trigger is CPU hotplug. Scoring the more severe of the arguable options (boot/module-load-reachable by a low-privileged local presence) rather than requiring full root.\nUI:N - CPU onlining and coretemp initialization happen automatically as part of normal system startup and hotplug handling. No victim action of any kind is required.\nS:U - The out-of-bounds write corrupts fields inside the kernel's own `struct platform_data` allocation and the follow-on damage stays in kernel slab memory on the same host. No VM, IOMMU, or sandbox security boundary is crossed.\nC:H - Indices 135–138 overwrite `ida.xa.xa_head` two bytes at a time, leaving a near-valid kernel pointer that the next `ida_alloc_range()` dereferences via `xas_find_marked()`/`find_next_zero_bit()`, reading arbitrary kernel slab memory as an `xa_node`/`ida_bitmap`. The corrupted `pd->cpumask` also redirects `rdmsr_on_cpu()` targets for the sysfs temperature readers.\nI:H - This is an out-of-bounds write that clobbers a live kernel pointer, the xarray spinlock and flags, and the CPU mask inside `struct platform_data`. The resulting type confusion lets `__set_bit()` in `ida_alloc_range()` write into misinterpreted kernel memory, and corrupted `core_data[]`/cpumask state can drive bogus `kfree()` and stale-sysfs teardown in `coretemp_remove_core()`.\nA:H - Once `xa_head` is corrupted, the next IDA operation walks a garbage or non-canonical pointer, producing an immediate oops or GP fault; corrupting the xarray spinlock can also wedge the hotplug path. Any of these is a kernel crash or hang."
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