{"id":"CVE-2026-23154","title":"net: fix segmentation of forwarding fraglist GRO","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix segmentation of forwarding fraglist GRO\n\nThis patch enhances GSO segment handling by properly checking\nthe SKB_GSO_DODGY flag for frag_list GSO packets, addres…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 9122d7280b2303e835cdfec156bd932ac1f586ed","Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 2cbef9ea5a0ac51863ede35c45f26931a85d3888","Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 3e62db1e3140449608975e29e0979cc5f3b1cc07","Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 3d48d59235c494d34e32052f768393111c0806ef","Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 426ca15c7f6cb6562a081341ca88893a50c59fa2","Linux 5.6"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-10T20:41:02.301817Z"},"published":"2026-02-14","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:45:02.027Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23154","references":[{"url":"https://git.kernel.org/stable/c/9122d7280b2303e835cdfec156bd932ac1f586ed"},{"url":"https://git.kernel.org/stable/c/2cbef9ea5a0ac51863ede35c45f26931a85d3888"},{"url":"https://git.kernel.org/stable/c/3e62db1e3140449608975e29e0979cc5f3b1cc07"},{"url":"https://git.kernel.org/stable/c/3d48d59235c494d34e32052f768393111c0806ef"},{"url":"https://git.kernel.org/stable/c/426ca15c7f6cb6562a081341ca88893a50c59fa2"}],"tags":["cve.org"],"epss":0.00119,"epssPercentile":0.02013,"ingestedAt":"2026-09-08T15:33:26.993Z","slug":"CVE-2026-23154","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix segmentation of forwarding fraglist GRO\n\nThis patch enhances GSO segment handling by properly checking\nthe SKB_GSO_DODGY flag for frag_list GSO packets, addressing\nlow throughput issues observed when a station accesses IPv4\nservers via hotspots with an IPv6-only upstream interface.\n\nSpecifically, it fixes a bug in GSO segmentation when forwarding\nGRO packets containing a frag_list. The function skb_segment_list\ncannot correctly process GRO skbs that have been converted by XLAT,\nsince XLAT only translates the header of the head skb. Consequently,\nskbs in the frag_list may remain untranslated, resulting in protocol\ninconsistencies and reduced throughput.\n\nTo address this, the patch explicitly sets the SKB_GSO_DODGY flag\nfor GSO packets in XLAT's IPv4/IPv6 protocol translation helpers\n(bpf_skb_proto_4_to_6 and bpf_skb_proto_6_to_4). This marks GSO\npackets as potentially modified after protocol translation. As a\nresult, GSO segmentation will avoid using skb_segment_list and\ninstead falls back to skb_segment for packets with the SKB_GSO_DODGY\nflag. This ensures that only safe and fully translated frag_list\npackets are processed by skb_segment_list, resolving protocol\ninconsistencies and improving throughput when forwarding GRO packets\nconverted by XLAT.\n\n## Affected\n\n- `Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 9122d7280b2303e835cdfec156bd932ac1f586ed`\n- `Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 2cbef9ea5a0ac51863ede35c45f26931a85d3888`\n- `Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 3e62db1e3140449608975e29e0979cc5f3b1cc07`\n- `Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 3d48d59235c494d34e32052f768393111c0806ef`\n- `Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 426ca15c7f6cb6562a081341ca88893a50c59fa2`\n- `Linux 5.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}