{"id":"CVE-2026-98934","state":"PUBLISHED","title":"ipv6: sr: use skb_get_hash_net() in seg6_make_flowlabel()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: sr: use skb_get_hash_net() in seg6_make_flowlabel()\n\nSince commit d58e468b1112 (\"flow_dissector: implements flow dissector\nBPF hook\") __skb_flow_dissect() needs a net pointer, either from\nskb->dev, skb->sk, or since commit 3cbf4ffba5ee (\"net: plumb network\nnamespace into __skb_flow_dissect\") a caller provided pointer.\n\nsyzbot was able to reach seg6_make_flowlabel() with an skb having\nneither skb->dev nor skb->sk set: a TIPC UDP bearer sends a discovery\nmessage through an IPv4 route using seg6 encap, while\nnet.ipv6.seg6_flowlabel is set to 1.\n\nseg6_make_flowlabel() already has a net pointer, use skb_get_hash_net().\n\nWARNING: net/core/flow_dissector.c:1131 at __skb_flow_dissect+0x910/0x5368 net/core/flow_dissector.c:1126, CPU#0: syz.0.17/4930\nCall trace:\n  __skb_flow_dissect+0x910/0x5368 net/core/flow_dissector.c:1126 (P)\n  __skb_get_hash_net+0xe0/0x29c net/core/flow_dissector.c:1903\n  skb_get_hash include/linux/skbuff.h:1663 [inline]\n  seg6_make_flowlabel+0xcc/0x1ec net/ipv6/seg6_iptunnel.c:132\n  __seg6_do_srh_encap+0x320/0xbf4 net/ipv6/seg6_iptunnel.c:161\n  seg6_do_srh+0x4b4/0xa44 net/ipv6/seg6_iptunnel.c:431\n  seg6_output_core+0x164/0x688 net/ipv6/seg6_iptunnel.c:681\n  seg6_output+0x44/0x1ac net/ipv6/seg6_iptunnel.c:744\n  lwtunnel_output+0x3d0/0x664 net/core/lwtunnel.c:356\n  dst_output include/net/dst.h:470 [inline]\n  ip_local_out+0x110/0x148 net/ipv4/ip_output.c:131\n  iptunnel_xmit+0x50c/0xd38 net/ipv4/ip_tunnel_core.c:97\n  udp_tunnel_xmit_skb+0x220/0x348 net/ipv4/udp_tunnel_core.c:187\n  tipc_udp_xmit+0x75c/0x9c0 net/tipc/udp_media.c:202\n  tipc_udp_send_msg+0x214/0x374 net/tipc/udp_media.c:274\n  tipc_bearer_xmit_skb+0x260/0x3b0 net/tipc/bearer.c:576\n  tipc_enable_bearer net/tipc/bearer.c:366 [inline]\n  __tipc_nl_bearer_enable+0xc90/0xfb0 net/tipc/bearer.c:1048\n  tipc_nl_bearer_enable+0x2c/0x48 net/tipc/bearer.c:1057\n  genl_family_rcv_msg_doit+0x1e4/0x2d4 net/netlink/genetlink.c:1114","publishedAt":"2026-10-23T12:11:43.459Z","updatedAt":"2026-10-30T12:40:23.809Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"de83419b5062a6f83bb9421be77cae734cbead65","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"8407a2c1aa67c2a110a576df8f82a4e259188b82","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"a43d96620d080b1b2324a53e38dd7b4bff4825c1","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"4ab37e4f4a33c64d9e565dc8c4c3ed774f05c0e3","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"8fe3d6717f5536793727e60b7a0b7ec20c697def","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"53b21bc2df6e8ed538bceda93a5104a5fe6a8a84","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"086e8acb3a0e55f6d22d29fae2a4a3b1561bb766","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"8ec454dcd00ce3375119111c6394964455b36d0d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/seg6_iptunnel.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/seg6_iptunnel.c"]}],"references":["https://git.kernel.org/stable/c/de83419b5062a6f83bb9421be77cae734cbead65","https://git.kernel.org/stable/c/8407a2c1aa67c2a110a576df8f82a4e259188b82","https://git.kernel.org/stable/c/a43d96620d080b1b2324a53e38dd7b4bff4825c1","https://git.kernel.org/stable/c/4ab37e4f4a33c64d9e565dc8c4c3ed774f05c0e3","https://git.kernel.org/stable/c/8fe3d6717f5536793727e60b7a0b7ec20c697def","https://git.kernel.org/stable/c/53b21bc2df6e8ed538bceda93a5104a5fe6a8a84","https://git.kernel.org/stable/c/086e8acb3a0e55f6d22d29fae2a4a3b1561bb766","https://git.kernel.org/stable/c/8ec454dcd00ce3375119111c6394964455b36d0d"],"weaknesses":[],"ingestedAt":"2026-10-30T13:00:06.648Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98934.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98934","state":"PUBLISHED","datePublished":"2026-10-23T12:11:43.459Z","dateUpdated":"2026-10-30T12:40:23.809Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.381Z"},"containers":{"cna":{"title":"ipv6: sr: use skb_get_hash_net() in seg6_make_flowlabel()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: sr: use skb_get_hash_net() in seg6_make_flowlabel()\n\nSince commit d58e468b1112 (\"flow_dissector: implements flow dissector\nBPF hook\") __skb_flow_dissect() needs a net pointer, either from\nskb->dev, skb->sk, or since commit 3cbf4ffba5ee (\"net: plumb network\nnamespace into __skb_flow_dissect\") a caller provided pointer.\n\nsyzbot was able to reach seg6_make_flowlabel() with an skb having\nneither skb->dev nor skb->sk set: a TIPC UDP bearer sends a discovery\nmessage through an IPv4 route using seg6 encap, while\nnet.ipv6.seg6_flowlabel is set to 1.\n\nseg6_make_flowlabel() already has a net pointer, use skb_get_hash_net().\n\nWARNING: net/core/flow_dissector.c:1131 at __skb_flow_dissect+0x910/0x5368 net/core/flow_dissector.c:1126, CPU#0: syz.0.17/4930\nCall trace:\n  __skb_flow_dissect+0x910/0x5368 net/core/flow_dissector.c:1126 (P)\n  __skb_get_hash_net+0xe0/0x29c net/core/flow_dissector.c:1903\n  skb_get_hash include/linux/skbuff.h:1663 [inline]\n  seg6_make_flowlabel+0xcc/0x1ec net/ipv6/seg6_iptunnel.c:132\n  __seg6_do_srh_encap+0x320/0xbf4 net/ipv6/seg6_iptunnel.c:161\n  seg6_do_srh+0x4b4/0xa44 net/ipv6/seg6_iptunnel.c:431\n  seg6_output_core+0x164/0x688 net/ipv6/seg6_iptunnel.c:681\n  seg6_output+0x44/0x1ac net/ipv6/seg6_iptunnel.c:744\n  lwtunnel_output+0x3d0/0x664 net/core/lwtunnel.c:356\n  dst_output include/net/dst.h:470 [inline]\n  ip_local_out+0x110/0x148 net/ipv4/ip_output.c:131\n  iptunnel_xmit+0x50c/0xd38 net/ipv4/ip_tunnel_core.c:97\n  udp_tunnel_xmit_skb+0x220/0x348 net/ipv4/udp_tunnel_core.c:187\n  tipc_udp_xmit+0x75c/0x9c0 net/tipc/udp_media.c:202\n  tipc_udp_send_msg+0x214/0x374 net/tipc/udp_media.c:274\n  tipc_bearer_xmit_skb+0x260/0x3b0 net/tipc/bearer.c:576\n  tipc_enable_bearer net/tipc/bearer.c:366 [inline]\n  __tipc_nl_bearer_enable+0xc90/0xfb0 net/tipc/bearer.c:1048\n  tipc_nl_bearer_enable+0x2c/0x48 net/tipc/bearer.c:1057\n  genl_family_rcv_msg_doit+0x1e4/0x2d4 net/netlink/genetlink.c:1114"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"de83419b5062a6f83bb9421be77cae734cbead65","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"8407a2c1aa67c2a110a576df8f82a4e259188b82","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"a43d96620d080b1b2324a53e38dd7b4bff4825c1","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"4ab37e4f4a33c64d9e565dc8c4c3ed774f05c0e3","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"8fe3d6717f5536793727e60b7a0b7ec20c697def","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"53b21bc2df6e8ed538bceda93a5104a5fe6a8a84","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"086e8acb3a0e55f6d22d29fae2a4a3b1561bb766","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","status":"affected","lessThan":"8ec454dcd00ce3375119111c6394964455b36d0d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/seg6_iptunnel.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/seg6_iptunnel.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/de83419b5062a6f83bb9421be77cae734cbead65"},{"url":"https://git.kernel.org/stable/c/8407a2c1aa67c2a110a576df8f82a4e259188b82"},{"url":"https://git.kernel.org/stable/c/a43d96620d080b1b2324a53e38dd7b4bff4825c1"},{"url":"https://git.kernel.org/stable/c/4ab37e4f4a33c64d9e565dc8c4c3ed774f05c0e3"},{"url":"https://git.kernel.org/stable/c/8fe3d6717f5536793727e60b7a0b7ec20c697def"},{"url":"https://git.kernel.org/stable/c/53b21bc2df6e8ed538bceda93a5104a5fe6a8a84"},{"url":"https://git.kernel.org/stable/c/086e8acb3a0e55f6d22d29fae2a4a3b1561bb766"},{"url":"https://git.kernel.org/stable/c/8ec454dcd00ce3375119111c6394964455b36d0d"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:40:23.809Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}