Linux Kernel Vulnerability copy.fail - CVE-2026-31431
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.
CVSSv3 Score: 7.8 CVE-2026-31431In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-place This mostly reverts commit 72548b093ee3 except for the copying of the associated data. There is no benefit in operating in-place in algif_aead since the source and destination come from different mappings. Get rid of all the complexity added for in-place operation and just copy the AD directly. Revised on 2026-05-13 00:00:00
CSIRTS triage
- What
- A vulnerability in the Linux kernel related to crypto operations has been identified.
- Who is affected
- All deployments of the Linux kernel are affected.
- Urgency
- Remediation is urgent due to active exploitation.
- Action
- Apply the latest kernel patches.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://fortiguard.fortinet.com/psirt/FG-IR-26-139
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
- criticalexploitedCVE-2026-31431: Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerabilitycisa-kev
- highexploited2026-005: High Vulnerability in the Linux Kernel ("Copy Fail")cert-eu
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