What is CVE-2026-31589?

CVE-2026-31589 is a critical-severity vulnerability in Linux, classified under Use After Free. CVSS score: 9.8/10. Published 2026-04-24.

How severe is CVE-2026-31589?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Use After Free in Linux

CVE-2026-31589

In the Linux kernel, the following vulnerability has been resolved: mm: call ->free_folio() directly in folio_unmap_invalidate() We can only call filemap_free_folio() if we have a reference to (or hold a lock on) the mapping. Otherwise…

Vulnerability class: Use-After-Free

EPSS: 0.001 (19.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions fb7d3bc4149395c1ae99029c852eab6c28fc3c88, 6.18.27, 7.1-rc1
Linux Linux_kernel

Weakness classification (CWE)

CWE-416 — Use After Free

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67

Frequently asked questions

What is CVE-2026-31589?: CVE-2026-31589 is a critical-severity vulnerability in Linux, classified under Use After Free. CVSS score: 9.8/10. Published 2026-04-24.
How severe is CVE-2026-31589?: Critical severity. CVSS v3 base score is 9.8 out of 10.