Critical severity · published Aug 15, 2026
CVE-2026-74406
vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().
9.8
CVSS
0.5%
EPSS
No
On KEV
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().
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
5602c48cf87562c2f95b831d690631935e834295 before 9c58c729d32e7cea5772cc44929c6cd61e5a31cd; 5602c48cf87562c2f95b831d690631935e834295 before f79c80f173fda9545b220c1f094b65fc06c252d0; 5602c48cf87562c2f95b831d690631935e834295 before 08f40c0d23c67c3aa4224c3311e134999c721fb4; 5602c48cf87562c2f95b831d690631935e834295 before 4a8cde6f7281ea2c4c290f9ad9923b3631defceb; 5602c48cf87562c2f95b831d690631935e834295 before ef44dac2a37f86eeae6b88ed10a6d60b35387dfd; 5602c48cf87562c2f95b831d690631935e834295 before 30a45c0bffdd62350261e2f2689fdba426a33578; +1 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74406
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-74406
git.kernel.org
https://git.kernel.org/stable/c/08f40c0d23c67c3aa4224c3311e134999c721fb4
git.kernel.org
https://git.kernel.org/stable/c/30a45c0bffdd62350261e2f2689fdba426a33578
git.kernel.org
https://git.kernel.org/stable/c/4a8cde6f7281ea2c4c290f9ad9923b3631defceb
git.kernel.org
https://git.kernel.org/stable/c/9c58c729d32e7cea5772cc44929c6cd61e5a31cd
git.kernel.org
https://git.kernel.org/stable/c/ef44dac2a37f86eeae6b88ed10a6d60b35387dfd
git.kernel.org
https://git.kernel.org/stable/c/f79c80f173fda9545b220c1f094b65fc06c252d0
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