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Exploited vulnerability · CISA KEV

Is CVE-2026-31431 exploited? Yes: in CISA KEV since 1 May 2026

Gociux · Linux Kernel · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-31431, Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 1 May 2026, 9 days after it was published. It affects Linux Kernel. If you run it, CISA's required action is: "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 1 May 2026
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity7.8CVSS 3.1 · high
US federal due15 May 2026BOD 22-01 deadline

What it is

Linux Kernel contains an incorrect resource transfer between spheres vulnerability that could allow for privilege escalation.

VendorLinux (32 exploited CVEs in KEV)
ProductKernel
VulnerabilityLinux Kernel Incorrect Resource Transfer Between Spheres Vulnerability
WeaknessCWE-669
Published22 Apr 2026
Added to KEV1 May 2026
Reported by (CNA)Linux

What to do

  1. Check whether you run it. Look for Kernel in your asset inventory, including appliances and cloud images. Stack check lists every exploited Linux CVE at once.
  2. Apply the fix. "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 22 Apr 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for Linux.

Other exploited CVEs in Kernel

References

Questions

Is CVE-2026-31431 being exploited?

Yes. CISA added CVE-2026-31431 to the Known Exploited Vulnerabilities catalog on 1 May 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-31431 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2026-31431?

"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Linux's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Kernel and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in May 2026 · Linux scorecard · act-now radar.

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