CVE-2026-74406
vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().
Description
In the Linux kernel, the following vulnerability has been resolved: vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive(). udp_tunnel_sock_release() could set sk->sk_user_data to NULL while vxlan_gro_prepare_receive() is running. Let's check if rcu_dereference_sk_user_data() is NULL after skb_gro_remcsum_init().
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 15, 2026, 6:22 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-74406
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.
- Apply the vxlan fix for GRO receive.
- Ensure RCU dereferencing is handled 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-2026-74406.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74406 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-2026-74406
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-2026-74406 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74406 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.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 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': '5602c48cf87562c2f95b831d690631935e834295', 'lessThan': '9c58c729d32e7cea5772cc44929c6cd61e5a31cd', 'versionType': 'git'}, {'status': 'affected', 'version': '5602c48cf87562c2f95b831d690631935e834295', 'lessThan': 'f79c80f173fda9545b220c1f094b65fc06c252d0', 'versionType': 'git'}, {'status': 'affected', 'version': '5602c48cf87562c2f95b831d690631935e834295', 'lessThan': '08f40c0d23c67c3aa4224c3311e134999c721fb4', 'versionType': 'git'}, {'status': 'affected', 'version': '5602c48cf87562c2f95b831d690631935e834295', 'lessThan': '4a8cde6f7281ea2c4c290f9ad9923b3631defceb', 'versionType': 'git'}, {'status': 'affected', 'version': '5602c48cf87562c2f95b831d690631935e834295', 'lessThan': 'ef44dac2a37f86eeae6b88ed10a6d60b35387dfd', 'versionType': 'git'}, {'status': 'affected', 'version': '5602c48cf87562c2f95b831d690631935e834295', 'lessThan': '30a45c0bffdd62350261e2f2689fdba426a33578', 'versionType': 'git'}], 'programFiles': ['drivers/net/vxlan/vxlan_core.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.7'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.7', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/vxlan/vxlan_core.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive(). udp_tunnel_sock_release() could set sk->sk_user_data to NULL while vxlan_gro_prepare_receive() is running. Let's check if rcu_dereference_sk_user_data() is NULL after skb_gro_remcsum_init(). Added Reference https://git.kernel.org/stable/c/08f40c0d23c67c3aa4224c3311e134999c721fb4 Added Reference https://git.kernel.org/stable/c/30a45c0bffdd62350261e2f2689fdba426a33578 Added Reference https://git.kernel.org/stable/c/4a8cde6f7281ea2c4c290f9ad9923b3631defceb Added Reference https://git.kernel.org/stable/c/9c58c729d32e7cea5772cc44929c6cd61e5a31cd Added Reference https://git.kernel.org/stable/c/ef44dac2a37f86eeae6b88ed10a6d60b35387dfd Added Reference https://git.kernel.org/stable/c/f79c80f173fda9545b220c1f094b65fc06c252d0