PT-2026-61175 · Linux · Linux Kernel

CVE-2026-63858 · Published 2026-07-19 · Updated 2026-07-20

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 flaw exists in the netfilter nf tables component where the process of moving hooks from the basechain or flowtable hook list to the transaction hook list during device deletions disrupts netlink dump path readers of the RCU-protected list. RCU (Read-Copy-Update) is a synchronization mechanism that allows multiple readers to access data simultaneously while it is being updated.

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

Related Identifiers

CVE-2026-63858

Affected Products

Linux Kernel

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-63858 · Security Note
• https://git.kernel.org/stable/c/4e69bfb32b2db323d9205fdb30e284481b37817c · Note
• https://twitter.com/windowsforum/status/2079127720005439873 · Twitter Post
• https://git.kernel.org/stable/c/10f79dbd7719d1da9f5884d13060322d8729f091 · Note