CVE-2026-43374

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-43374

Key Details

CVE	CVE-2026-43374
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel
Classified as	CWE-416 (Use After Free)

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:

net: nexthop: fix percpu use-after-free in remove_nh_grp_entry

When removing a nexthop from a group, remove_nh_grp_entry() publishes

the new group via rcu_assign_pointer() then immediately frees the

removed entry's percpu stats with free_percpu(). However, the

synchronize_net() grace period in the caller remove_nexthop_from_groups()

runs after the free. RCU readers that entered before the publish still

see the old group and can dereference the freed stats via

nh_grp_entry_stats_inc() -> get_cpu_ptr(nhge->stats), causing a

use-after-free on percpu memory.

Fix by deferring the free_percpu() until after synchronize_net() in the

caller. Removed entries are chained via nh_list onto a local deferred

free list. After the grace period completes and all RCU readers have

finished, the percpu stats are safely freed. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-43374
CVE	https://www.cve.org/CVERecord?id=CVE-2026-43374

Source

Reference

NVD

CVE