{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74604",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74604"
  ],
  "published": "2026-08-22T15:32:12Z",
  "summary": "Revert \"thermal/drivers/hwmon: Cleanup coding style a bit\"",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"thermal/drivers/hwmon: Cleanup coding style a bit\"\n\nRevert commit 030a48b0f6ce (\"thermal/drivers/hwmon: Cleanup coding style\na bit\") that introduced a use-after-free into the error path of\nthermal_add_hwmon_sysfs() by removing a valid check from it.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "upstream_fixed": "6.18.45"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74604"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2434f4765da8ccd7ef31be88b86f1bfa2e95be11"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b4c01ae6dd56d9dfd96bd1b29c28afa8fa06b366"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/999e573212d5f1debf073c68be35e55bbfad12fc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6a48ee9a5bda0f8ee501f9bef159fb9f39ff519a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8d34019d1413629a434a7e8d9f91c76d256196a0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6b446d335ba16e93a266dd77adf1ba51abc82df4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ff8da20b6f47c48d46e47f93f7a59e2d56ee9107"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-25T05:42:41Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.4,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is in thermal_add_hwmon_sysfs() during thermal zone/hwmon driver registration; it is only reachable from kernel thermal driver probe/init paths, not from network protocols or physical buses.\nAC:L - When a second thermal zone shares an existing hwmon type and registration fails, the error path deterministically kfree()s a still-linked hwmon object, leaving a dangling entry that any later sysfs access can hit without winning a race.\nPR:N - No privileges are needed to exploit the resulting UAF: hwmon temp attributes are world-readable (0444) and unprivileged local processes routinely read /sys/class/hwmon on phones, servers, and embedded devices after latent corruption during multi-sensor thermal probe.\nUI:N - Exploitation requires no victim interaction beyond normal system operation; reading thermal sensors or subsequent kernel hwmon operations can trigger use of the freed object automatically.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the host kernel; it does not cross VM, container, or IOMMU security boundaries by itself.\nC:H - The use-after-free of struct thermal_hwmon_device leaves a dangling list entry and device pointer; subsequent sysfs reads or thermal hwmon operations can dereference attacker-influencable freed heap memory, enabling arbitrary kernel memory disclosure.\nI:H - Heap UAF on a long-lived thermal_hwmon_device structure adjacent to list pointers and device objects provides standard kernel heap corruption primitives that can be developed into arbitrary write and local privilege escalation.\nA:H - Use-after-free in kernel thermal/hwmon registration can cause immediate kernel oops/panic on access to the freed hwmon device, and repeated or concurrent sysfs access can reliably crash or hang the system."
    }
  }
}