{"id":"CVE-2026-74406","title":"vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().\n\nudp_tunnel_sock_release() could set sk->sk_user_data to NULL\nwhile vxlan_gro_prepare_receive() is r…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 5602c48cf87562c2f95b831d690631935e834295 < 9c58c729d32e7cea5772cc44929c6cd61e5a31cd","Linux >= 5602c48cf87562c2f95b831d690631935e834295 < f79c80f173fda9545b220c1f094b65fc06c252d0","Linux >= 5602c48cf87562c2f95b831d690631935e834295 < 08f40c0d23c67c3aa4224c3311e134999c721fb4","Linux >= 5602c48cf87562c2f95b831d690631935e834295 < 4a8cde6f7281ea2c4c290f9ad9923b3631defceb","Linux >= 5602c48cf87562c2f95b831d690631935e834295 < ef44dac2a37f86eeae6b88ed10a6d60b35387dfd","Linux >= 5602c48cf87562c2f95b831d690631935e834295 < 30a45c0bffdd62350261e2f2689fdba426a33578","Linux 4.7"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T18:55:52.328317Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:05:43.336Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74406","references":[{"url":"https://git.kernel.org/stable/c/9c58c729d32e7cea5772cc44929c6cd61e5a31cd"},{"url":"https://git.kernel.org/stable/c/f79c80f173fda9545b220c1f094b65fc06c252d0"},{"url":"https://git.kernel.org/stable/c/08f40c0d23c67c3aa4224c3311e134999c721fb4"},{"url":"https://git.kernel.org/stable/c/4a8cde6f7281ea2c4c290f9ad9923b3631defceb"},{"url":"https://git.kernel.org/stable/c/ef44dac2a37f86eeae6b88ed10a6d60b35387dfd"},{"url":"https://git.kernel.org/stable/c/30a45c0bffdd62350261e2f2689fdba426a33578"}],"tags":["cve.org"],"epss":0.00491,"epssPercentile":0.40816,"ingestedAt":"2026-10-16T19:46:24.367Z","slug":"CVE-2026-74406","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().\n\nudp_tunnel_sock_release() could set sk->sk_user_data to NULL\nwhile vxlan_gro_prepare_receive() is running.\n\nLet's check if rcu_dereference_sk_user_data() is NULL after\nskb_gro_remcsum_init().\n\n## Affected\n\n- `Linux >= 5602c48cf87562c2f95b831d690631935e834295 < 9c58c729d32e7cea5772cc44929c6cd61e5a31cd`\n- `Linux >= 5602c48cf87562c2f95b831d690631935e834295 < f79c80f173fda9545b220c1f094b65fc06c252d0`\n- `Linux >= 5602c48cf87562c2f95b831d690631935e834295 < 08f40c0d23c67c3aa4224c3311e134999c721fb4`\n- `Linux >= 5602c48cf87562c2f95b831d690631935e834295 < 4a8cde6f7281ea2c4c290f9ad9923b3631defceb`\n- `Linux >= 5602c48cf87562c2f95b831d690631935e834295 < ef44dac2a37f86eeae6b88ed10a6d60b35387dfd`\n- `Linux >= 5602c48cf87562c2f95b831d690631935e834295 < 30a45c0bffdd62350261e2f2689fdba426a33578`\n- `Linux 4.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}