{"id":"CVE-2022-4129","title":"A flaw was found in the Linux kernel's Layer 2 Tunneling Protocol (L2TP)","summary":"A flaw was found in the Linux kernel's Layer 2 Tunneling Protocol (L2TP). A missing lock when clearing sk_user_data can lead to a race condition and NULL pointer dereference. A local user could use this flaw to potentially crash the syst…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-667"],"vendor":"linux","product":"layer_2_tunneling_protocol","affected":["layer_2_tunneling_protocol < 6.0","fedora = 35","fedora = 36","fedora = 37"],"patched":["layer_2_tunneling_protocol 6.0"],"published":"2022-11-28","updated":"2026-10-14","sourceUpdated":"2026-10-14T14:17:28.110","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2022-4129","references":[{"url":"https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html","label":"secalert@redhat.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7X5SPXMXXFANDASPCKER2JIQO2F3UHCP/","label":"secalert@redhat.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AM5KFIE6JNZXHBA5A2KYDZAT3MEX2B67/","label":"secalert@redhat.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JOKXNIM2R4FQCDRQV67UMAY6EBC72QFG/","label":"secalert@redhat.com"},{"url":"https://lore.kernel.org/all/20221114191619.124659-1-jakub%40cloudflare.com/t","label":"secalert@redhat.com"},{"url":"https://lore.kernel.org/netdev/20221121085426.21315-1-jakub%40cloudflare.com/t","label":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7X5SPXMXXFANDASPCKER2JIQO2F3UHCP/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AM5KFIE6JNZXHBA5A2KYDZAT3MEX2B67/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JOKXNIM2R4FQCDRQV67UMAY6EBC72QFG/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lore.kernel.org/all/20221114191619.124659-1-jakub%40cloudflare.com/t","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lore.kernel.org/netdev/20221121085426.21315-1-jakub%40cloudflare.com/t","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-794697.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00176,"epssPercentile":0.07132,"ingestedAt":"2026-10-14T15:36:13.926Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2025-04-14T15:37:45.752033Z"},"slug":"CVE-2022-4129","body":"## Overview\n\nA flaw was found in the Linux kernel's Layer 2 Tunneling Protocol (L2TP). A missing lock when clearing sk_user_data can lead to a race condition and NULL pointer dereference. A local user could use this flaw to potentially crash the system causing a denial of service.\n\n## Affected\n\n- `layer_2_tunneling_protocol < 6.0`\n- `fedora = 35`\n- `fedora = 36`\n- `fedora = 37`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `layer_2_tunneling_protocol 6.0`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}