Exploited vulnerabilities / CVE-2026-31431
Confirmed exploited · privilege escalation · Linux KernelCVE-2026-31431
Linux Kernel privilege escalation, confirmed exploited in the wild.
Linux Kernel contains an incorrect resource transfer between spheres vulnerability that could allow for privilege escalation.
| CISA's name for it | Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability |
|---|---|
| Vendor and product | Linux · Kernel |
| Type | privilege escalation · CWE-669 |
| Exploited | Confirmed by CISA listed 1 May 2026 |
| Likelihood | one of the most likely to be exploited of every vulnerability tracked |
| Deadline | 15 May 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | lore.kernel.org ↗ · xint.io ↗ · git.kernel.org ↗ · nvd.nist.gov ↗ |
Three steps, in this order
Install the update on every affected system, servers and workstations alike.
Escalation bugs are chained after a first foothold: check for other exposures an attacker could start from.
Review who holds administrative rights, and alert on new ones.
| CISA's 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. |
|---|
Know before someone else finds it
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CVE-2026-31431 in short
Is CVE-2026-31431 being exploited?
Yes. CISA added CVE-2026-31431 to its Known Exploited Vulnerabilities catalogue on 1 May 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2026-31431?
US federal agencies must remediate it by 15 May 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2026-31431 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 98%, the 99th percentile of every CVE it scores.
How do I fix CVE-2026-31431?
Install the update on every affected system, servers and workstations alike. Escalation bugs are chained after a first foothold: check for other exposures an attacker could start from. Review who holds administrative rights, and alert on new ones.
Other Linux vulnerabilities being exploited
| CVE | Product | Type | Listed |
|---|---|---|---|
| CVE-2026-46300 | Kernel | exploited vulnerability | 28 October 2026 |
| CVE-2025-39964 | Kernel | exploited vulnerability | 18 September 2026 |
| CVE-2026-53266 | Kernel | memory corruption | 18 September 2026 |
| CVE-2025-39682 | Kernel | exploited vulnerability | 18 September 2026 |
| CVE-2026-53362 | Kernel | privilege escalation | 27 August 2026 |
| CVE-2022-0995 | Kernel | privilege escalation | 26 August 2026 |
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.