PT-2026-36345 · Linux · Linux Kernel

Syzbot + 1 · Published 2026-05-01 · Updated 2026-05-16 · CVE-2026-31715

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/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 condition exists in the f2fs component of the Linux kernel. The issue occurs in the f2fs write end io() function when sbi->nr pages[F2FS WB CP DATA] is decremented to zero. This can lead to a NULL pointer dereference in the f2fs in warm node list() function because f2fs put super() may set sbi->node inode to NULL concurrently. This race condition results in a system panic when the kernel attempts to check if a folio belongs to the node inode.

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-2026-31715

ECHO-531C-0C07-20ED

OPENSUSE-SU-2026:10793-1

Affected Products

Linux Kernel

References · 51

• https://git.kernel.org/stable/c/963d2e24d9d92a31e6773b0f642214f10013ebf7 · Patch
• https://cve.org/CVERecord?id=CVE-2026-31715 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31715 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31715 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-31715 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31715 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10793-1 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-31715 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31715 · Vendor Advisory
• https://git.kernel.org/stable/c/188bb65f247a7a7c62f287c9a263aee3cad96fa5 · Patch
• https://git.kernel.org/stable/c/2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53 · Patch
• https://suse.com/security/cve/CVE-2026-31713 · Note
• https://suse.com/security/cve/CVE-2026-31712 · Note
• https://suse.com/security/cve/CVE-2026-43500 · Note
• https://git.kernel.org/stable/c/7be222de96c0f9eee6e65eeb017ef855ee185cfa · Note