CVE-2026-31431: Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability

CISA Known Exploited Vulnerability (KEV)

Description

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

Required action (CISA)

"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Notes

https://lore.kernel.org/linux-cve-announce/2026042214-CVE-2026-31431-3d65@gregkh/; https://xint.io/blog/copy-fail-linux-distributions#the-fix-6 ; https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/about/ ; https://nvd.nist.gov/vuln/detail/CVE-2026-31431

Weakness behind it

CISA records this vulnerability as an instance of CWE-669. From there the chain continues into CAPEC attack patterns and ATT&CK techniques, all inside this corpus.

References

• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31431
• KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog