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PatchSiren cyber security CVE debrief

CVE-2026-74604 Linux CVE debrief

A use-after-free vulnerability was introduced into the error path of thermal_add_hwmon_sysfs() by removing a valid check from it. Linux kernel developers and maintainers should assess exposure and prioritize verification of Linux kernel versions, especially those identified as affected, to determine if their configurations or deployments are vulnerable.

Vendor
Linux
Product
Unknown
CVSS
HIGH 8.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-22
Original CVE updated
2026-10-16
Advisory published
2026-08-22
Advisory updated
2026-10-16

Who should care

Linux kernel developers, maintainers, and users who need to verify and patch affected versions. Linux kernel developers and maintainers should assess exposure and prioritize verification of Linux kernel versions, especially those identified as affected, to determine if their configurations or deployments are vulnerable. This includes verifying Linux kernel versions to determine if they are affected, prioritizing patching or applying fixes for affected

Why it matters

A use-after-free vulnerability was introduced into the error path of thermal_add_hwmon_sysfs() by removing a valid check from it. Linux kernel developers and maintainers should assess exposure and prioritize verification of Linux kernel versions, especially those identified as affected, to determine if their configurations or deployments are vulnerable.

  • Verify Linux kernel versions to determine if they are affected.
  • Prioritize patching or applying fixes for affected versions.
  • Monitor Linux kernel updates and advisories for further information.

Technical summary

The CVE record describes a use-after-free vulnerability introduced into the error path of thermal_add_hwmon_sysfs() by removing a valid check from it. The vulnerability affects various Linux kernel versions. Linux kernel developers and maintainers should assess exposure and prioritize verification of Linux kernel versions, especially those identified as affected, to determine if their configurations or deployments are vulnerable. This vulnerability has a high impact on Linux kernel developers, maintainers, and users who need to verify and patch affected versions.

Defensive priority

High priority for Linux kernel maintainers and developers to verify and patch affected versions.

Recommended defensive actions

  • Verify Linux kernel versions to determine if they are affected by CVE-2026-74604.
  • Prioritize patching or applying fixes for affected Linux kernel versions.
  • Monitor Linux kernel updates and advisories for further information on CVE-2026-74604.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source item provide details on the vulnerability, including its introduction and affected versions. However, the corpus does not establish specific exploitation or impact, requiring verification from official sources.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-74604 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-74604

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-74604 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-74604

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Revert "thermal/drivers/hwmon: Cleanup coding style a bit"

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/74xxx/CVE-2026-74604.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/2434f4765da8ccd7ef31be88b86f1bfa2e95be11

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/b4c01ae6dd56d9dfd96bd1b29c28afa8fa06b366

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/999e573212d5f1debf073c68be35e55bbfad12fc

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/6a48ee9a5bda0f8ee501f9bef159fb9f39ff519a

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/8d34019d1413629a434a7e8d9f91c76d256196a0

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/6b446d335ba16e93a266dd77adf1ba51abc82df4

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/ff8da20b6f47c48d46e47f93f7a59e2d56ee9107

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.