Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since May 1, 2026.
CVE-2026-31431
Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability
Added to KEV May 1, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2026-31431
- CWE
- CWE-669
- Affected products
- Kernel · Linux Kernel · Linux
What happened
Linux Kernel contains an incorrect resource transfer between spheres vulnerability that could allow for privilege escalation.
What it means for your business
Linux Kernel is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-31431). Linux Kernel contains an incorrect resource transfer between spheres vulnerability that could allow for privilege escalation. CISA remediation due date: 2026-05-15. If you need help checking exposure, call (864) 335-9223.
Required action
"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date: May 15, 2026
Sources
Related briefs
Linux Kernel Out-of-Bounds Write Vulnerability
Linux Kernel is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-53266). Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version. CISA remediation due date: 2026-09-21. If you need help checking exposure, call (864) 335-9223.
Linux Kernel Race Condition Vulnerability
Linux Kernel is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2025-39964). Linux Kernel contains a race condition vulnerability which allows concurrent writes to the same AF_ALG socket causing data to be unpredictably interleaved and creating inconsistencies in the socket's internal state. CISA remediation due date: 2026-09-21. If you need help checking exposure, call (864) 335-9223.
Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability
Linux Kernel is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2025-39682). Linux Kernel contains an improper check for unusual or exceptional conditions vulnerability in the TLS receive path which allows a zero-length record retrieved from the rx_list to bypass the intended recvmsg() record-type handling, potentially causing subsequent TLS records to be processed using incorrect zero-copy and queuing assumptions. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version. CISA remediation due date: 2026-09-21. If you need help checking exposure, call (864) 335-9223.
Linux Toolkit Theming vulnerability
Linux Toolkit Theming vulnerability (CVE-2026-76023) was added to Microsoft’s security update guidance. This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see [Google Chrome Releases](https://chromereleases.googleblog.com/2026) for more information. If you need help checking exposure, call (864) 335-9223.
Need help patching?
PremierePC monitors KEV alerts for managed clients and helps teams prioritize remediation before attackers do.