Linux Kernel netlink Use-After-Free Rated 7.8 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-64123

Key Details

CVE	CVE-2026-64123
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-15
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)
Exploitation prediction (EPSS)	0.13% probability of exploitation in the next 30 days (2% percentile) -- FIRST.org's EPSS model.

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: hsr: defer node table free until after RCU readers

HSR node-list and node-status generic-netlink operations run under

rcu_read_lock(). They walk hsr->node_db through hsr_get_next_node() and

hsr_get_node_data(), but RTM_DELLINK teardown removes the same node table

with plain list_del() and frees each node immediately.

That lets a generic-netlink reader hold a struct hsr_node pointer across

hsr_dellink(). In a KASAN build, widening the reader window after

hsr_get_next_node() obtains the node reproduces a slab-use-after-free

when the reader copies node->macaddress_A; the freeing stack is

hsr_del_nodes() from hsr_dellink().

Use list_del_rcu() and defer the free through the existing

hsr_free_node_rcu() callback. This matches the lifetime rule used by the

HSR prune paths, which already delete nodes with list_del_rcu() and

call_rcu(). (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-64123
CVE	https://www.cve.org/CVERecord?id=CVE-2026-64123

Source

Reference

NVD

CVE