CVE-2026-64123
net: hsr: defer node table free until after RCU readers
Description
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().
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 19, 2026, 4:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64123
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to the latest stable version.
- Apply the specific patch for net: hsr: defer node table free.
- Rebuild and redeploy the kernel.
- Verify the patch has been applied correctly.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64123.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64123 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64123
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64123 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64123 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'b9a1e627405d68d475a3c1f35e685ccfb5bbe668', 'lessThan': '0ea70fb46940620848c08d9d399455c9e82fecdb', 'versionType': 'git'}, {'status': 'affected', 'version': 'b9a1e627405d68d475a3c1f35e685ccfb5bbe668', 'lessThan': '8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b', 'versionType': 'git'}, {'status': 'affected', 'version': 'b9a1e627405d68d475a3c1f35e685ccfb5bbe668', 'lessThan': 'c5580114e0492bcd2e0a37613ed4c311e3fa3d4d', 'versionType': 'git'}, {'status': 'affected', 'version': 'b9a1e627405d68d475a3c1f35e685ccfb5bbe668', 'lessThan': '7713f4aafb577ff49fa67f0488d9c7dddc64d6ce', 'versionType': 'git'}, {'status': 'affected', 'version': 'b9a1e627405d68d475a3c1f35e685ccfb5bbe668', 'lessThan': '6324423a8e6591f41a16c09a8f9a84e554ac147c', 'versionType': 'git'}, {'status': 'affected', 'version': 'b9a1e627405d68d475a3c1f35e685ccfb5bbe668', 'lessThan': '8c3af18bb0d7c921a5219194037509463eb2ffde', 'versionType': 'git'}, {'status': 'affected', 'version': 'b9a1e627405d68d475a3c1f35e685ccfb5bbe668', 'lessThan': 'aaec7096f9961eb223b5b149abe9495525c205d9', 'versionType': 'git'}, {'status': 'affected', 'version': '08523d5a2f4a9e4202e00d282c164d453cabe2d2', 'versionType': 'git'}, {'status': 'affected', 'version': '5.2.12', 'lessThan': '5.3', 'versionType': 'semver'}], 'programFiles': ['net/hsr/hsr_framereg.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.3'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.3', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.259', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/hsr/hsr_framereg.c'], 'defaultStatus': 'affected'}] Added Description 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(). Added Reference https://git.kernel.org/stable/c/0ea70fb46940620848c08d9d399455c9e82fecdb Added Reference https://git.kernel.org/stable/c/6324423a8e6591f41a16c09a8f9a84e554ac147c Added Reference https://git.kernel.org/stable/c/7713f4aafb577ff49fa67f0488d9c7dddc64d6ce Added Reference https://git.kernel.org/stable/c/8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b Added Reference https://git.kernel.org/stable/c/8c3af18bb0d7c921a5219194037509463eb2ffde Added Reference https://git.kernel.org/stable/c/aaec7096f9961eb223b5b149abe9495525c205d9 Added Reference https://git.kernel.org/stable/c/c5580114e0492bcd2e0a37613ed4c311e3fa3d4d