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CVE-2026-74604 (GCVE-0-2026-74604)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40
VLAI
Title
Revert "thermal/drivers/hwmon: Cleanup coding style a bit"
Summary
In the Linux kernel, the following vulnerability has been resolved: Revert "thermal/drivers/hwmon: Cleanup coding style a bit" Revert commit 030a48b0f6ce ("thermal/drivers/hwmon: Cleanup coding style a bit") that introduced a use-after-free into the error path of thermal_add_hwmon_sysfs() by removing a valid check from it.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < 2434f4765da8ccd7ef31be88b86f1bfa2e95be11 (git)
Affected: 030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < b4c01ae6dd56d9dfd96bd1b29c28afa8fa06b366 (git)
Affected: 030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < 999e573212d5f1debf073c68be35e55bbfad12fc (git)
Affected: 030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < 6a48ee9a5bda0f8ee501f9bef159fb9f39ff519a (git)
Affected: 030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < 8d34019d1413629a434a7e8d9f91c76d256196a0 (git)
Affected: 030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < 6b446d335ba16e93a266dd77adf1ba51abc82df4 (git)
Affected: 030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < ff8da20b6f47c48d46e47f93f7a59e2d56ee9107 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "value": "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."
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "value": "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."
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        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74604",
    "datePublished": "2026-08-22T15:31:52.295Z",
    "dateReserved": "2026-08-15T05:44:03.919Z",
    "dateUpdated": "2026-08-25T05:40:28.622Z",
    "state": "PUBLISHED"
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      "title": "Revert \"thermal/drivers/hwmon: Cleanup coding style a bit\"",
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      "version": "3"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-02T20:15:42+00:00",
      "cve": "CVE-2026-74604",
      "id": "CVE-2026-74604",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Revert \"thermal/drivers/hwmon: Cleanup coding style a bit\"",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74604.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-27T16:51:16Z",
      "cve": "CVE-2026-74604",
      "id": "CVE-2026-74604",
      "initial_release_date": "2026-08-27T16:51:16Z",
      "product_status:known_affected": "110",
      "product_status:known_not_affected": "174",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74604",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74604.json",
      "version": "2"
    }
  }
}



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