PT-2026-35017 · Linux · Linux Kernel

Published 2026-04-24 · Updated 2026-06-05 · CVE-2026-31665

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 netfilter nft ct component. The function nft ct timeout obj destroy() frees the timeout object using kfree() immediately after nf ct untimeout(), without waiting for an RCU grace period. This allows concurrent packet processing on other CPUs to access the timeout object via rcu dereference() in nf ct timeout data() after it has been freed. RCU (Read-Copy-Update) is a synchronization mechanism that allows multiple readers to access data while it is being updated.

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-2026-31665

ECHO-D3A1-5DB9-C25E

OESA-2026-2581

Affected Products

Linux Kernel

References · 124

• https://git.kernel.org/stable/c/f16fe84879a5280f05ebbcea593a189ba0f3e79a · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2025-23145 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31398 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31698 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-23473 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-71239 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31628 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31467 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-23102 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31532 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-71094 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-43148 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31518 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31496 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31452 · Security Note