CVE-2026-63968

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-63968

Key Details

CVE	CVE-2026-63968
CVSS Score / Version	7.5 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is none; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

ipv6: fix possible infinite loop in fib6_select_path()

Found while auditing the same pattern Sashiko reported in

rt6_fill_node() [1]. Apply the same fix as

commit f8d8ce1b515a ("ipv6: fix possible infinite loop in fib6_info_uses_dev()").

Writers holding tb6_lock can list_del_rcu(&first->fib6_siblings)

without waiting for RCU readers; first->fib6_siblings.next then

still points into the old ring and this softirq-side walker never

reaches &first->fib6_siblings as its terminator. fib6_purge_rt()

always WRITE_ONCE()s first->fib6_nsiblings to 0 before

list_del_rcu(), so an inside-loop check is a reliable detach signal.

[1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-63968
CVE	https://www.cve.org/CVERecord?id=CVE-2026-63968

Source

Reference

NVD

CVE