{"id":"CVE-2026-31684","summary":"net: sched: act_csum: validate nested VLAN headers","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: act_csum: validate nested VLAN headers\n\ntcf_csum_act() walks nested VLAN headers directly from skb-\u003edata when an\nskb still carries in-payload VLAN tags. The current code reads\nvlan-\u003eh_vlan_encapsulated_proto and then pulls VLAN_HLEN bytes without\nfirst ensuring that the full VLAN header is present in the linear area.\n\nIf only part of an inner VLAN header is linearized, accessing\nh_vlan_encapsulated_proto reads past the linear area, and the following\nskb_pull(VLAN_HLEN) may violate skb invariants.\n\nFix this by requiring pskb_may_pull(skb, VLAN_HLEN) before accessing and\npulling each nested VLAN header. If the header still is not fully\navailable, drop the packet through the existing error path.","modified":"2026-07-09T18:30:40.738931198Z","published":"2026-04-25T08:47:01.555Z","related":["ALSA-2026:21556","ALSA-2026:21557","ALSA-2026:21706","ALSA-2026:21745","CGA-c8px-gjmq-2838","SUSE-SU-2026:21834-1","SUSE-SU-2026:21841-1","SUSE-SU-2026:21845-1","SUSE-SU-2026:21860-1","SUSE-SU-2026:21876-1","SUSE-SU-2026:21877-1","SUSE-SU-2026:21916-1","SUSE-SU-2026:21919-1","SUSE-SU-2026:2217-1","SUSE-SU-2026:2238-1","openSUSE-SU-2026:20826-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31684.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0410c619e86551677fb79887a38eccad3f5a0725"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3d165d975305cf76ff0b10a3c798fb31e5f5f9a5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09"},{"type":"WEB","url":"https://git.kernel.org/stable/c/886469b6455611a511aa6013e957e15e50577513"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a69738efea0996d05a3c7d2178551b891744df1b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c842743d073bdd683606cb414eb0ca84465dd834"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ec4930979b3f7bbeb7af5744599fc6603a4dba62"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31684.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31684"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2ecba2d1e45b24620a7c3df9531895cf68d5dec6"},{"fixed":"0410c619e86551677fb79887a38eccad3f5a0725"},{"fixed":"886469b6455611a511aa6013e957e15e50577513"},{"fixed":"46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09"},{"fixed":"eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2"},{"fixed":"a69738efea0996d05a3c7d2178551b891744df1b"},{"fixed":"ec4930979b3f7bbeb7af5744599fc6603a4dba62"},{"fixed":"3d165d975305cf76ff0b10a3c798fb31e5f5f9a5"},{"fixed":"c842743d073bdd683606cb414eb0ca84465dd834"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"3764bfae5056e95617b6ee074129297e11710886"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.19.99"},{"fixed":"4.20"}]}],"versions":["v4.19.98","v4.19.97","v4.19.96","v4.19.95","v4.19.94","v4.19.93","v4.19.92","v4.19.91","v4.19.90","v4.19.89","v4.19.88","v4.19.87","v4.19.86","v4.19.85","v4.19.84","v4.19.83","v4.19.82","v4.19.81","v4.19.80","v4.19.79","v4.19.78","v4.19.77","v4.19.76","v4.19.75","v4.19.74","v4.19.73","v4.19.72","v4.19.71","v4.19.70","v4.19.69","v4.19.68","v4.19.67","v4.19.66","v4.19.65","v4.19.64","v4.19.63","v4.19.62","v4.19.61","v4.19.60","v4.19.59","v4.19.58","v4.19.57","v4.19.56","v4.19.55","v4.19.54","v4.19.53","v4.19.52","v4.19.51","v4.19.50","v4.19.49","v4.19.48","v4.19.47","v4.19.46","v4.19.45","v4.19.44","v4.19.43","v4.19.42","v4.19.41","v4.19.40","v4.19.39","v4.19.38","v4.19.37","v4.19.36","v4.19.35","v4.19.34","v4.19.33","v4.19.32","v4.19.31","v4.19.30","v4.19.29","v4.19.28","v4.19.27","v4.19.26","v4.19.25","v4.19.24","v4.19.23","v4.19.22","v4.19.21","v4.19.20","v4.19.19","v4.19.18","v4.19.17","v4.19.16","v4.19","v4.19.15","v4.19.14","v4.19.13","v4.19.12","v4.19.11","v4.19.10","v4.19.9","v4.19.8","v4.19.7","v4.19.6","v4.19.5","v4.19.4","v4.19.3","v4.19.2","v4.19.1","v4.19-rc2","v4.19-rc8","v4.19-rc4","v4.19-rc1","v4.19-rc7","v4.19-rc6","v4.19-rc5","v4.19-rc3","v4.18","v4.18-rc1","v4.18-rc8","v4.18-rc2","v4.18-rc5","v4.18-rc6","v4.18-rc7","v4.17","v4.18-rc3","v4.18-rc4","v4.17-rc1","v4.17-rc2","v4.17-rc7","v4.17-rc3","v4.17-rc4","v4.16","v4.17-rc6","v4.17-rc5","v4.16-rc7","v4.16-rc4","v4.16-rc1","v4.16-rc2","v4.16-rc5","v4.16-rc3","v4.16-rc6","v4.14","v4.15","v4.15-rc1","v4.15-rc4","v4.15-rc9","v4.15-rc8","v4.15-rc7","v4.15-rc3","v4.15-rc2","v4.15-rc5","v4.15-rc6","v4.14-rc1","v4.14-rc7","v4.14-rc3","v4.13","v4.14-rc8","v4.14-rc4","v4.14-rc6","v4.14-rc2","v4.14-rc5","v4.13-rc2","v4.13-rc1","v4.13-rc3","v4.13-rc7","v4.13-rc4","v4.13-rc5","v4.13-rc6","v4.12-rc1","v4.12","v4.12-rc5","v4.12-rc7","v4.12-rc6","v4.12-rc4","v4.12-rc2","v4.12-rc3","v4.11","v4.11-rc1","v4.11-rc6","v4.11-rc8","v4.11-rc7","v4.11-rc3","v4.11-rc5","v4.11-rc2","v4.11-rc4","v4.10","v4.9","v4.10-rc8","v4.10-rc3","v4.10-rc1","v4.10-rc7","v4.10-rc6","v4.10-rc2","v4.10-rc5","v4.10-rc4","v4.9-rc7","v4.9-rc6","v4.9-rc8","v4.9-rc1","v4.9-rc5","v4.9-rc3","v4.9-rc4","v4.9-rc2","v4.8","v4.8-rc8","v4.8-rc2","v4.8-rc1","v4.8-rc7","v4.8-rc6","v4.8-rc5","v4.8-rc4","v4.8-rc3","v4.7","v4.7-rc4","v4.7-rc2","v4.7-rc1","v4.7-rc7","v4.7-rc6","v4.7-rc3","v4.7-rc5","v4.6","v4.6-rc1","v4.6-rc6","v4.6-rc4","v4.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