{"api_version":"1","generated_at":"2026-10-24T20:40:00+00:00","cve":"CVE-2026-98934","urls":{"html":"https://cve.report/CVE-2026-98934","api":"https://cve.report/api/cve/CVE-2026-98934.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98934","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98934"},"summary":{"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","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-23 13:17:14","updated_at":"2026-10-23 13:17:14"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/8ec454dcd00ce3375119111c6394964455b36d0d","name":"https://git.kernel.org/stable/c/8ec454dcd00ce3375119111c6394964455b36d0d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/086e8acb3a0e55f6d22d29fae2a4a3b1561bb766","name":"https://git.kernel.org/stable/c/086e8acb3a0e55f6d22d29fae2a4a3b1561bb766","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8fe3d6717f5536793727e60b7a0b7ec20c697def","name":"https://git.kernel.org/stable/c/8fe3d6717f5536793727e60b7a0b7ec20c697def","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/53b21bc2df6e8ed538bceda93a5104a5fe6a8a84","name":"https://git.kernel.org/stable/c/53b21bc2df6e8ed538bceda93a5104a5fe6a8a84","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4ab37e4f4a33c64d9e565dc8c4c3ed774f05c0e3","name":"https://git.kernel.org/stable/c/4ab37e4f4a33c64d9e565dc8c4c3ed774f05c0e3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98934","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98934","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 4ab37e4f4a33c64d9e565dc8c4c3ed774f05c0e3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 8fe3d6717f5536793727e60b7a0b7ec20c697def git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 53b21bc2df6e8ed538bceda93a5104a5fe6a8a84 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 086e8acb3a0e55f6d22d29fae2a4a3b1561bb766 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 8ec454dcd00ce3375119111c6394964455b36d0d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.20","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.160 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.113 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.56 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.10 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv6/seg6_iptunnel.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"4ab37e4f4a33c64d9e565dc8c4c3ed774f05c0e3","status":"affected","version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","versionType":"git"},{"lessThan":"8fe3d6717f5536793727e60b7a0b7ec20c697def","status":"affected","version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","versionType":"git"},{"lessThan":"53b21bc2df6e8ed538bceda93a5104a5fe6a8a84","status":"affected","version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","versionType":"git"},{"lessThan":"086e8acb3a0e55f6d22d29fae2a4a3b1561bb766","status":"affected","version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","versionType":"git"},{"lessThan":"8ec454dcd00ce3375119111c6394964455b36d0d","status":"affected","version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv6/seg6_iptunnel.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.20"},{"lessThan":"4.20","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.160","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.113","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.56","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.160","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.113","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.56","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.10","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"4.20","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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"}],"providerMetadata":{"dateUpdated":"2026-10-23T12:11:43.459Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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"}],"title":"ipv6: sr: use skb_get_hash_net() in seg6_make_flowlabel()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98934","datePublished":"2026-10-23T12:11:43.459Z","dateReserved":"2026-09-25T10:25:14.381Z","dateUpdated":"2026-10-23T12:11:43.459Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-23 13:17:14","lastModifiedDate":"2026-10-23 13:17:14","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98934","Ordinal":"1","Title":"ipv6: sr: use skb_get_hash_net() in seg6_make_flowlabel()","CVE":"CVE-2026-98934","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98934","Ordinal":"1","NoteData":"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","Type":"Description","Title":"ipv6: sr: use skb_get_hash_net() in seg6_make_flowlabel()"}]}}}