CVE-2026-31431: Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Linux Kernel contains an incorrect resource transfer between spheres vulnerability that could allow for privilege escalation.
CSIRTS triage
- What
- The vulnerability allows for privilege escalation due to incorrect resource transfer between spheres.
- Who is affected
- All mainstream Linux distributions shipping a kernel built since 2017 are affected.
- Urgency
- Remediation is urgent due to the availability of a public proof-of-concept exploit and its critical severity.
- Action
- Apply the interim mitigation immediately.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-31431
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2026-31431Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-31431 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
- high[UPDATE] [high] Linux Kernel (Dirty Frag): Multiple vulnerabilities allow gaining administrator rightscert-bund
- unknownexploitedUSN-8528-1: Linux kernel (Xilinx ZynqMP) vulnerabilitiesubuntu
- unknownMultiple vulnerabilities in Red Hat Linux kernel (July 3, 2026)cert-fr-avis
- unknownRedHat Linux Kernel Multiple Vulnerabilitieshkcert
- unknownMultiple vulnerabilities in the Ubuntu Linux kernel (June 26, 2026)cert-fr-avis
- criticalexploitedImpact of Linux Kernel vulnerabilities on B&R productscisa
- unknownexploitedCVE-2026-31431aws
- unknownexploitedDirty Frag and other issues in Amazon Linux kernelsaws
- unknownOngoing updates on Copy.fail and variantsaws
- unknownexploitedLinux Kernel Vulnerability copy.fail - CVE-2026-31431fortinet
- highexploited2026-005: High Vulnerability in the Linux Kernel ("Copy Fail")cert-eu
Recent advisories for Linux Kernel Incorrect
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
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