CVE-2026-74406
Critical
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().
SeverityCritical
CVSS9.8
Exploit probability—
Product
Linux
PublishedAug 15, 2026
First seenAug 15, 2026
How to fix
Update
- Linux Linux022af89207fcc992ec5c712c14e2e018c335eb1e, a3104cc1fed994519538301efcaab175f9af6008, 9c58c729d32e7cea5772cc44929c6cd61e5a31cd, f79c80f173fda9545b220c1f094b65fc06c252d0, 08f40c0d23c67c3aa4224c3311e134999c721fb4, 4a8cde6f7281ea2c4c290f9ad9923b3631defceb, ef44dac2a37f86eeae6b88ed10a6d60b35387dfd, 30a45c0bffdd62350261e2f2689fdba426a33578 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 5602c48cf87562c2f95b831d690631935e834295 ≤ v < 022af89207fcc992ec5c712c14e2e018c335eb1e, 5602c48cf87562c2f95b831d690631935e834295 ≤ v < a3104cc1fed994519538301efcaab175f9af6008, 5602c48cf87562c2f95b831d690631935e834295 ≤ v < 9c58c729d32e7cea5772cc44929c6cd61e5a31cd, 5602c48cf87562c2f95b831d690631935e834295 ≤ v < f79c80f173fda9545b220c1f094b65fc06c252d0, 5602c48cf87562c2f95b831d690631935e834295 ≤ v < 08f40c0d23c67c3aa4224c3311e134999c721fb4, 5602c48cf87562c2f95b831d690631935e834295 ≤ v < 4a8cde6f7281ea2c4c290f9ad9923b3631defceb, 5602c48cf87562c2f95b831d690631935e834295 ≤ v < ef44dac2a37f86eeae6b88ed10a6d60b35387dfd, 5602c48cf87562c2f95b831d690631935e834295 ≤ v < 30a45c0bffdd62350261e2f2689fdba426a33578, 4.7 | 022af89207fcc992ec5c712c14e2e018c335eb1e, a3104cc1fed994519538301efcaab175f9af6008, 9c58c729d32e7cea5772cc44929c6cd61e5a31cd, f79c80f173fda9545b220c1f094b65fc06c252d0, 08f40c0d23c67c3aa4224c3311e134999c721fb4, 4a8cde6f7281ea2c4c290f9ad9923b3631defceb, ef44dac2a37f86eeae6b88ed10a6d60b35387dfd, 30a45c0bffdd62350261e2f2689fdba426a33578 |
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