{"id":"CVE-2026-23154","title":"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…","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":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.6, < 6.12.69","linux_kernel >= 6.13, < 6.18.9","linux_kernel = 6.19"],"patched":["linux_kernel 6.18.9"],"published":"2026-02-14","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:18:43.383","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-23154","references":[{"url":"https://git.kernel.org/stable/c/2cbef9ea5a0ac51863ede35c45f26931a85d3888","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3d48d59235c494d34e32052f768393111c0806ef","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3e62db1e3140449608975e29e0979cc5f3b1cc07","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/426ca15c7f6cb6562a081341ca88893a50c59fa2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9122d7280b2303e835cdfec156bd932ac1f586ed","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00186,"epssPercentile":0.08115,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-10T20:41:02.301817Z"},"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_kernel >= 5.6, < 6.12.69`\n- `linux_kernel >= 6.13, < 6.18.9`\n- `linux_kernel = 6.19`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.18.9`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":221633,"id":"CVE-2026-23154","ts":1792035294866,"field":"cvss","old":null,"new":"5.5"},{"seq":221632,"id":"CVE-2026-23154","ts":1792035294866,"field":"severity","old":"none","new":"medium"}]}