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CVE-2026-80553 Linux CVE debrief

A vulnerability in the Linux kernel's s390/vfio_ccw component has been addressed. The issue involves canceling existing workqueues during device release to prevent work from being dispatched after the private struct is freed. This fix ensures that workqueues are properly cleaned up, preventing potential use-after-free issues and system instability. The vulnerability was resolved through the addition of cleanup tags in the _release_dev function. This change is crucial for maintaining the stability and security of systems utilizing the affected Linux kernel versions.

Vendor
Linux
Product
Unknown
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-26
Original CVE updated
2026-10-16
Advisory published
2026-08-26
Advisory updated
2026-10-16

Who should care

Defenders responsible for Linux kernel-based systems, particularly those using the s390/vfio_ccw component, should assess exposure and prioritize patching. This includes operators, platform administrators, vulnerability management teams, and security teams who need to ensure the stability and security of their systems. Verification of system configurations, inventory checks, and prioritization of patching are essential defensive actions to prevent system

Why it matters

This vulnerability in the Linux kernel's s390/vfio_ccw component requires attention from defenders to prevent potential system instability or crashes. Verification of system configurations, inventory checks, and prioritization of patching are essential defensive actions.

  • Potential for system crashes or instability if the vulnerability is exploited
  • Need for verification of system configurations and inventory for potential exposure
  • Priority for patching and updating affected Linux kernel versions

Technical summary

The vulnerability involves a use-after-free issue in the s390/vfio_ccw component of the Linux kernel. The fix adds cleanup tags to ensure workqueues are properly canceled during device release, preventing work from being dispatched after the private struct is freed. This change addresses the vulnerability and prevents potential system instability or crashes. The affected component is part of the Linux kernel's s390/vfio_ccw module, which requires patching to resolve the issue. Defenders should prioritize verifying and applying patches for this vulnerability.

Defensive priority

Defenders should prioritize verifying and applying patches for this vulnerability, particularly for systems using the affected Linux kernel versions.

Recommended defensive actions

  • Verify and apply patches for the affected Linux kernel versions
  • Review system configurations and inventory for potential exposure
  • Monitor system logs for suspicious activity related to the s390/vfio_ccw component
  • Perform vulnerability scans to identify potentially affected systems
  • Implement compensating controls for exposed systems while remediation is scheduled
  • Track exceptions and retest remediated assets
  • Close the item only after evidence of successful remediation is documented

Evidence notes

The CVE record and associated source item provide details on the vulnerability and its resolution in the Linux kernel. Specific exploitation details or victim information are not provided. The fix involves adding cleanup tags to ensure workqueues are properly canceled during device release, addressing a use-after-free issue. The vulnerability affects the s390/vfio_ccw component of the Linux kernel, and defenders should verify system configurations and prioritize patching.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-80553 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-80553

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

  • CVE-2026-80553 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-80553

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

Supplemental references

  • s390/vfio_ccw: Cancel existing workqueues

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/80xxx/CVE-2026-80553.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/87d569cb35a541b31a184faf982540694d4c9a89

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/7492ca2d0c5d59add01e267be9f5a6eeb8076fd7

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/b94b28c1f0fae53b2f2d6180ae6442c9a1558f67

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/e868ea8be0bc88c6982f48ecf3259d98afd884ae

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/dc47a98abe6714577a25224534dbd356051097a3

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/b7ae0f7993867d009a4b554fc1d6d451c10580a0

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/77f5e888d2e607a0b3141fb95091ad6ef1cca9a2

    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.