PT-2026-34941 · Linux · Linux Kernel

Published 2026-04-24 · Updated 2026-05-06 · CVE-2026-31589

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A use-after-free issue exists in the Linux kernel within the folio unmap invalidate() function. The problem occurs when filemap free folio() is called without a reference to or a lock on the mapping. Because the folio may have already been removed from the mapping, the mapping can be removed, leading to a use-after-free when the system attempts to access mapping->a ops.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-31589

OPENSUSE-SU-2026:10703-1

Affected Products

Linux Kernel

References · 74

• https://ubuntu.com/security/CVE-2026-31589 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31589 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31589 · Vendor Advisory
• https://git.kernel.org/stable/c/c330e65ea59c4805d6ab6757c4ddfe8c63acef31 · Patch
• https://git.kernel.org/stable/c/b667df39d98a7a24be7c2a40ff0863dac1ad2cd7 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-31589 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-31589 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31589 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10703-1 · Vendor Advisory
• https://git.kernel.org/stable/c/615d9bb2ccad42f9e21d837431e401db2e471195 · Patch
• https://suse.com/security/cve/CVE-2026-31595 · Note
• https://suse.com/security/cve/CVE-2026-31629 · Note
• https://twitter.com/infoflowcloud/status/2047734052631818674 · Twitter Post
• https://suse.com/security/cve/CVE-2026-31616 · Note
• https://suse.com/security/cve/CVE-2026-31597 · Note