CVE-2026-74406

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

State: Published
Severity: 9.8 Critical
Published: Aug 15, 2026
Updated: Oct 30, 2026
Reserved: Aug 15, 2026

Read the record on cve.org

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().

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	5602c48cf87562c2f95b831d690631935e834295 to before 022af89207fcc992ec5c712c14e2e018c335eb1eAffected 5602c48cf87562c2f95b831d690631935e834295 to before a3104cc1fed994519538301efcaab175f9af6008Affected 5602c48cf87562c2f95b831d690631935e834295 to before 9c58c729d32e7cea5772cc44929c6cd61e5a31cdAffected 5602c48cf87562c2f95b831d690631935e834295 to before f79c80f173fda9545b220c1f094b65fc06c252d0Affected 5602c48cf87562c2f95b831d690631935e834295 to before 08f40c0d23c67c3aa4224c3311e134999c721fb4Affected 5602c48cf87562c2f95b831d690631935e834295 to before 4a8cde6f7281ea2c4c290f9ad9923b3631defcebAffected 5602c48cf87562c2f95b831d690631935e834295 to before ef44dac2a37f86eeae6b88ed10a6d60b35387dfdAffected 5602c48cf87562c2f95b831d690631935e834295 to before 30a45c0bffdd62350261e2f2689fdba426a33578Affected
LinuxLinux	4.7Affected before 4.7Not affected 5.10.273 through 5.10.Not affected 5.15.224 through 5.15.Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.97 through 6.12.Not affected 6.18.40 through 6.18.Not affected 7.1.5 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

5602c48cf87562c2f95b831d690631935e834295 to before 022af89207fcc992ec5c712c14e2e018c335eb1eAffected
5602c48cf87562c2f95b831d690631935e834295 to before a3104cc1fed994519538301efcaab175f9af6008Affected
5602c48cf87562c2f95b831d690631935e834295 to before 9c58c729d32e7cea5772cc44929c6cd61e5a31cdAffected
5602c48cf87562c2f95b831d690631935e834295 to before f79c80f173fda9545b220c1f094b65fc06c252d0Affected
5602c48cf87562c2f95b831d690631935e834295 to before 08f40c0d23c67c3aa4224c3311e134999c721fb4Affected
5602c48cf87562c2f95b831d690631935e834295 to before 4a8cde6f7281ea2c4c290f9ad9923b3631defcebAffected
5602c48cf87562c2f95b831d690631935e834295 to before ef44dac2a37f86eeae6b88ed10a6d60b35387dfdAffected
5602c48cf87562c2f95b831d690631935e834295 to before 30a45c0bffdd62350261e2f2689fdba426a33578Affected

LinuxLinux

4.7Affected
before 4.7Not affected
5.10.273 through 5.10.*Not affected
5.15.224 through 5.15.*Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.97 through 6.12.*Not affected
6.18.40 through 6.18.*Not affected
7.1.5 through 7.1.*Not affected
7.2 and laterNot affected

References

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