{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50027",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-50027"
  ],
  "published": "2024-10-21T19:40:44Z",
  "summary": "thermal: core: Free tzp copy along with the thermal zone",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nthermal: core: Free tzp copy along with the thermal zone\n\nThe object pointed to by tz->tzp may still be accessed after being\nfreed in thermal_zone_device_unregister(), so move the freeing of it\nto the point after the removal completion has been completed at which\nit cannot be accessed any more.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-50027"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eabe285e1c629a719d6e68fc319939c63b83bf22"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bdb0d40507c85bee33c2a71fde7b2e857346f112"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/827a07525c099f54d3b15110408824541ec66b3c"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The dangling `tz->tzp` is reached through the thermal generic-netlink family (AF_NETLINK socket, init netns) and the world-readable `/sys/class/thermal/thermal_zoneN/{slope,offset,k_*,sustainable_powe r}` attributes, and the free side is a local device/driver teardown; no remote peer parses any of this data.\nAC:L - The attacker drives the surviving side of the race itself \u2014 a tight loop of `THERMAL_GENL_CMD_TZ_GET_TEMP`/`TZ_GET_TRIP` pins the zone with `get_device()` while unregistration proceeds \u2014 and the freed window spans `device_del()` teardown, a netlink multicast delete notification and an unbounded `wait_for_completion()`, which is wide enough to reliably reclaim the 48-byte `tzp` from the heavily-trafficked kmalloc-64 cache; the attempt is repeatable at will.\nPR:L - None of the thermal genl ops set `GENL_ADMIN_PERM` (`thermal_genl_ops[]`), and `thermal_zone_get_by_id()` performs no capability check, so an ordinary unprivileged local user obtains and holds the zone reference; the `tzp` sysfs show handlers are likewise world-readable at 0444/0644.\nUI:N - The attacker's netlink polling loop needs no cooperation from any other user, and the unregistration it races is ordinary system activity (charger/battery power-supply removal, transceiver or CPU-package zone teardown, driver rebind) rather than an action the attacker must induce a victim to perform.\nS:U - The corrupted memory is kernel slab memory managed by the same kernel security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - `thermal_zone_get_slope()`/`thermal_zone_get_offset()` and the power-allocator PID code read the freed `tzp`, and those values propagate into the temperature returned over netlink and sysfs, disclosing whatever kernel object has since been allocated into the reclaimed kmalloc-64 slot; as with any UAF the stale pointer generalises into an arbitrary-read primitive once the attacker controls the reallocation.\nI:H - The dangling pointer is also written through \u2014 `estimate_pid_constants()`/`get_sustainable_power()` store into `tz->tzp->k_po`, `k_pu`, `k_i` and `sustainable_power`, and the `sustainable_power`/`k_*`/`slope`/`offset` sysfs store handlers assign directly through `tz->tzp` \u2014 giving a heap write into a reallocated, groomable kmalloc-64 object and thus corruption of adjacent kernel structures usable for control-flow hijack and privilege escalation.\nA:H - Dereferencing the freed `tzp` (plus the `def_governor` fallback entering `power_allocator_manage()` with `tz->governor_data` already NULLed) produces slab use-after-free corruption and oops/panic, and an unprivileged user can retry the race indefinitely."
    }
  }
}