{"cve":"CVE-2023-54114","nvd":{"published":"2025-12-24T13:16:13.323","modified":"2026-06-17T06:46:49.610","status":"Deferred","description":"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->mac_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->network_header - nhoff to reset mac_header\nin skb_gso_error_unwind() if inner-layer protocol gso fails.\nHowever, skb->network_header may be reset by inner-layer protocol\ngso function e.g. mpls_gso_segment. skb->mac_header reset by the\ninaccurate network_header will be larger than skb headroom.\n\nnsh_gso_segment\n    nhoff = skb->network_header - skb->mac_header;\n    __skb_pull(skb,nsh_len)\n    skb_mac_gso_segment\n        mpls_gso_segment\n            skb_reset_network_header(skb);//skb->network_header+=nsh_len\n            return -EINVAL;\n    skb_gso_error_unwind\n        skb_push(skb, nsh_len);\n        skb->mac_header = skb->network_header - nhoff;\n        // skb->mac_header > skb->headroom, cause skb_push panic\n\nUse correct mac_offset to restore mac_header and get rid of nhoff.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/02b20e0bc0c2628539e9e518dc342787c3332de2","https://git.kernel.org/stable/c/2f88c8d38ecf5ed0273f99a067246899ba499eb2","https://git.kernel.org/stable/c/435855b0831b351cb72cb38369ee33122ce9574c","https://git.kernel.org/stable/c/6fbedf987b6b8ed54a50e2205d998eb2c8be72f9","https://git.kernel.org/stable/c/c83b49383b595be50647f0c764a48c78b5f3c4f8"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:18:08.089039631+00:00"},"epss":{"cve":"CVE-2023-54114","score":0.00219,"percentile":0.12455,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}