CVE-2026-98934 (GCVE-0-2026-98934)
Vulnerability from cvelistv5
Published
2026-10-23 12:11
Modified
2026-10-30 12:40
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipv6: sr: use skb_get_hash_net() in seg6_make_flowlabel()
Since commit d58e468b1112 ("flow_dissector: implements flow dissector
BPF hook") __skb_flow_dissect() needs a net pointer, either from
skb->dev, skb->sk, or since commit 3cbf4ffba5ee ("net: plumb network
namespace into __skb_flow_dissect") a caller provided pointer.
syzbot was able to reach seg6_make_flowlabel() with an skb having
neither skb->dev nor skb->sk set: a TIPC UDP bearer sends a discovery
message through an IPv4 route using seg6 encap, while
net.ipv6.seg6_flowlabel is set to 1.
seg6_make_flowlabel() already has a net pointer, use skb_get_hash_net().
WARNING: net/core/flow_dissector.c:1131 at __skb_flow_dissect+0x910/0x5368 net/core/flow_dissector.c:1126, CPU#0: syz.0.17/4930
Call trace:
__skb_flow_dissect+0x910/0x5368 net/core/flow_dissector.c:1126 (P)
__skb_get_hash_net+0xe0/0x29c net/core/flow_dissector.c:1903
skb_get_hash include/linux/skbuff.h:1663 [inline]
seg6_make_flowlabel+0xcc/0x1ec net/ipv6/seg6_iptunnel.c:132
__seg6_do_srh_encap+0x320/0xbf4 net/ipv6/seg6_iptunnel.c:161
seg6_do_srh+0x4b4/0xa44 net/ipv6/seg6_iptunnel.c:431
seg6_output_core+0x164/0x688 net/ipv6/seg6_iptunnel.c:681
seg6_output+0x44/0x1ac net/ipv6/seg6_iptunnel.c:744
lwtunnel_output+0x3d0/0x664 net/core/lwtunnel.c:356
dst_output include/net/dst.h:470 [inline]
ip_local_out+0x110/0x148 net/ipv4/ip_output.c:131
iptunnel_xmit+0x50c/0xd38 net/ipv4/ip_tunnel_core.c:97
udp_tunnel_xmit_skb+0x220/0x348 net/ipv4/udp_tunnel_core.c:187
tipc_udp_xmit+0x75c/0x9c0 net/tipc/udp_media.c:202
tipc_udp_send_msg+0x214/0x374 net/tipc/udp_media.c:274
tipc_bearer_xmit_skb+0x260/0x3b0 net/tipc/bearer.c:576
tipc_enable_bearer net/tipc/bearer.c:366 [inline]
__tipc_nl_bearer_enable+0xc90/0xfb0 net/tipc/bearer.c:1048
tipc_nl_bearer_enable+0x2c/0x48 net/tipc/bearer.c:1057
genl_family_rcv_msg_doit+0x1e4/0x2d4 net/netlink/genetlink.c:1114
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 Version: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 Version: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 Version: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 Version: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 Version: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 Version: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 Version: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 |
||
{
"containers": {
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},
{
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},
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},
{
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{
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},
{
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"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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}
],
"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-\u003edev, skb-\u003esk, 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-\u003edev nor skb-\u003esk 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": "2026-10-30T12:40:23.809Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
],
"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": "2026-10-30T12:40:23.809Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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