What’s Vulnerable › Vulnerabilities

CVE-2026-74406: vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-30

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().

Affected products

• Linux: 4.7 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/022af89207fcc992ec5c712c14e2e018c335eb1e
• https://git.kernel.org/stable/c/08f40c0d23c67c3aa4224c3311e134999c721fb4
• https://git.kernel.org/stable/c/30a45c0bffdd62350261e2f2689fdba426a33578
• https://git.kernel.org/stable/c/4a8cde6f7281ea2c4c290f9ad9923b3631defceb
• https://git.kernel.org/stable/c/9c58c729d32e7cea5772cc44929c6cd61e5a31cd
• https://git.kernel.org/stable/c/a3104cc1fed994519538301efcaab175f9af6008
• https://git.kernel.org/stable/c/ef44dac2a37f86eeae6b88ed10a6d60b35387dfd
• https://git.kernel.org/stable/c/f79c80f173fda9545b220c1f094b65fc06c252d0

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