{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98934", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.381Z", "datePublished": "2026-10-23T12:11:43.459Z", "dateUpdated": "2026-10-23T12:11:43.459Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-23T12:11:43.459Z" }, "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": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/seg6_iptunnel.c" ], "versions": [ { "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "lessThan": "4ab37e4f4a33c64d9e565dc8c4c3ed774f05c0e3", "status": "affected", "versionType": "git" }, { "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "lessThan": "8fe3d6717f5536793727e60b7a0b7ec20c697def", "status": "affected", "versionType": "git" }, { "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "lessThan": "53b21bc2df6e8ed538bceda93a5104a5fe6a8a84", "status": "affected", "versionType": "git" }, { "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "lessThan": "086e8acb3a0e55f6d22d29fae2a4a3b1561bb766", "status": "affected", "versionType": "git" }, { "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "lessThan": "8ec454dcd00ce3375119111c6394964455b36d0d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/seg6_iptunnel.c" ], "versions": [ { "version": "4.20", "status": "affected" }, { "version": "0", "lessThan": "4.20", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.56", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.10", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "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" } ] } ] } ], "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" } } } }