PT-2026-35015 · Linux · Linux Kernel

Published 2026-04-24 · Updated 2026-05-26 · CVE-2026-31663

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 issue exists in the xfrm component of the Linux kernel. After asynchronous crypto completes, the xfrm input resume() function calls dev put() immediately upon re-entry before the socket buffer (skb) reaches transport finish. Because the skb->dev pointer is subsequently used inside NF HOOK and its okfn, a race condition can occur with device teardown.

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

Related Identifiers

CVE-2026-31663

Affected Products

Linux Kernel

References · 15

• https://security-tracker.debian.org/tracker/CVE-2026-31663 · Vendor Advisory
• https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-31663 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2026-31663 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31663 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31663 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31663 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-31663 · Security Note
• https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31663 · Vendor Advisory
• https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b · Patch
• https://docs.bell-sw.com/security/cves/CVE-2026-31663 · Note
• https://git.kernel.org/linus/1c428b03840094410c5fb6a5db30640486bbbfcb · Note
• https://twitter.com/CVEnew/status/2047731913213751301 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2047749265292693582 · Twitter Post