{"id":"CVE-2023-54114","summary":"net: nsh: Use correct mac_offset to unwind gso skb in nsh_gso_segment()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nsh: Use correct mac_offset to unwind gso skb in nsh_gso_segment()\n\nAs the call trace shows, skb_panic was caused by wrong skb-\u003emac_header\nin nsh_gso_segment():\n\ninvalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\nCPU: 3 PID: 2737 Comm: syz Not tainted 6.3.0-next-20230505 #1\nRIP: 0010:skb_panic+0xda/0xe0\ncall Trace:\n skb_push+0x91/0xa0\n nsh_gso_segment+0x4f3/0x570\n skb_mac_gso_segment+0x19e/0x270\n __skb_gso_segment+0x1e8/0x3c0\n validate_xmit_skb+0x452/0x890\n validate_xmit_skb_list+0x99/0xd0\n sch_direct_xmit+0x294/0x7c0\n __dev_queue_xmit+0x16f0/0x1d70\n packet_xmit+0x185/0x210\n packet_snd+0xc15/0x1170\n packet_sendmsg+0x7b/0xa0\n sock_sendmsg+0x14f/0x160\n\nThe root cause is:\nnsh_gso_segment() use skb-\u003enetwork_header - nhoff to reset mac_header\nin skb_gso_error_unwind() if inner-layer protocol gso fails.\nHowever, skb-\u003enetwork_header may be reset by inner-layer protocol\ngso function e.g. mpls_gso_segment. skb-\u003emac_header reset by the\ninaccurate network_header will be larger than skb headroom.\n\nnsh_gso_segment\n    nhoff = skb-\u003enetwork_header - skb-\u003emac_header;\n    __skb_pull(skb,nsh_len)\n    skb_mac_gso_segment\n        mpls_gso_segment\n            skb_reset_network_header(skb);//skb-\u003enetwork_header+=nsh_len\n            return -EINVAL;\n    skb_gso_error_unwind\n        skb_push(skb, nsh_len);\n        skb-\u003emac_header = skb-\u003enetwork_header - nhoff;\n        // skb-\u003emac_header \u003e skb-\u003eheadroom, cause skb_push panic\n\nUse correct mac_offset to restore mac_header and get rid of nhoff.","modified":"2026-04-02T09:45:36.183233Z","published":"2025-12-24T13:06:36.214Z","related":["SUSE-SU-2026:0263-1","SUSE-SU-2026:0317-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54114.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/02b20e0bc0c2628539e9e518dc342787c3332de2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2f88c8d38ecf5ed0273f99a067246899ba499eb2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/435855b0831b351cb72cb38369ee33122ce9574c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6fbedf987b6b8ed54a50e2205d998eb2c8be72f9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c83b49383b595be50647f0c764a48c78b5f3c4f8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cb38e62922aa3991793344b5a5870e7291c74a44"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cdd8160dcda1fed2028a5f96575a84afc23aff7d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d2309e0cb27b6871b273fbc1725e93be62570d86"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54114.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54114"},{"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":"c411ed854584a71b0e86ac3019b60e4789d88086"},{"fixed":"2f88c8d38ecf5ed0273f99a067246899ba499eb2"},{"fixed":"d2309e0cb27b6871b273fbc1725e93be62570d86"},{"fixed":"435855b0831b351cb72cb38369ee33122ce9574c"},{"fixed":"02b20e0bc0c2628539e9e518dc342787c3332de2"},{"fixed":"cdd8160dcda1fed2028a5f96575a84afc23aff7d"},{"fixed":"6fbedf987b6b8ed54a50e2205d998eb2c8be72f9"},{"fixed":"cb38e62922aa3991793344b5a5870e7291c74a44"},{"fixed":"c83b49383b595be50647f0c764a48c78b5f3c4f8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54114.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.14.0"},{"fixed":"4.14.316"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.284"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.244"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.181"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.30"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.3.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54114.json"}}],"schema_version":"1.7.5"}