{"id":"CVE-2026-23154","state":"PUBLISHED","title":"net: fix segmentation of forwarding fraglist GRO","description":"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, 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.","publishedAt":"2026-02-14T16:01:21.758Z","updatedAt":"2026-10-19T18:25:33.706Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9fd1ff5d2ac7181844735806b0a703c942365291","status":"affected","lessThan":"9122d7280b2303e835cdfec156bd932ac1f586ed","versionType":"git"},{"version":"9fd1ff5d2ac7181844735806b0a703c942365291","status":"affected","lessThan":"2cbef9ea5a0ac51863ede35c45f26931a85d3888","versionType":"git"},{"version":"9fd1ff5d2ac7181844735806b0a703c942365291","status":"affected","lessThan":"3e62db1e3140449608975e29e0979cc5f3b1cc07","versionType":"git"},{"version":"9fd1ff5d2ac7181844735806b0a703c942365291","status":"affected","lessThan":"3d48d59235c494d34e32052f768393111c0806ef","versionType":"git"},{"version":"9fd1ff5d2ac7181844735806b0a703c942365291","status":"affected","lessThan":"426ca15c7f6cb6562a081341ca88893a50c59fa2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/filter.c","net/ipv4/tcp_offload.c","net/ipv4/udp_offload.c","net/ipv6/tcpv6_offload.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.6","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.69","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.9","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/filter.c","net/ipv4/tcp_offload.c","net/ipv4/udp_offload.c","net/ipv6/tcpv6_offload.c"]}],"references":["https://git.kernel.org/stable/c/9122d7280b2303e835cdfec156bd932ac1f586ed","https://git.kernel.org/stable/c/2cbef9ea5a0ac51863ede35c45f26931a85d3888","https://git.kernel.org/stable/c/3e62db1e3140449608975e29e0979cc5f3b1cc07","https://git.kernel.org/stable/c/3d48d59235c494d34e32052f768393111c0806ef","https://git.kernel.org/stable/c/426ca15c7f6cb6562a081341ca88893a50c59fa2","https://cert-portal.siemens.com/productcert/html/ssa-082556.html","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html","https://cert-portal.siemens.com/productcert/html/ssa-784472.html"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23154.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23154","state":"PUBLISHED","datePublished":"2026-02-14T16:01:21.758Z","dateUpdated":"2026-10-19T18:25:33.706Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.977Z"},"containers":{"cna":{"title":"net: fix segmentation of forwarding fraglist GRO","descriptions":[{"lang":"en","value":"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, 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9fd1ff5d2ac7181844735806b0a703c942365291","status":"affected","lessThan":"9122d7280b2303e835cdfec156bd932ac1f586ed","versionType":"git"},{"version":"9fd1ff5d2ac7181844735806b0a703c942365291","status":"affected","lessThan":"2cbef9ea5a0ac51863ede35c45f26931a85d3888","versionType":"git"},{"version":"9fd1ff5d2ac7181844735806b0a703c942365291","status":"affected","lessThan":"3e62db1e3140449608975e29e0979cc5f3b1cc07","versionType":"git"},{"version":"9fd1ff5d2ac7181844735806b0a703c942365291","status":"affected","lessThan":"3d48d59235c494d34e32052f768393111c0806ef","versionType":"git"},{"version":"9fd1ff5d2ac7181844735806b0a703c942365291","status":"affected","lessThan":"426ca15c7f6cb6562a081341ca88893a50c59fa2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/filter.c","net/ipv4/tcp_offload.c","net/ipv4/udp_offload.c","net/ipv6/tcpv6_offload.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.6","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.69","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.9","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/filter.c","net/ipv4/tcp_offload.c","net/ipv4/udp_offload.c","net/ipv6/tcpv6_offload.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:01:15.543Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.12.69"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.18.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA 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