Vulnerability-Lookup

GHSA-646V-44W7-2G7C

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-23 15:31

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98934"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:14Z",
    "severity": null
  },
  "details": "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",
  "id": "GHSA-646v-44w7-2g7c",
  "modified": "2026-10-23T15:31:31Z",
  "published": "2026-10-23T15:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98934"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/086e8acb3a0e55f6d22d29fae2a4a3b1561bb766"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ab37e4f4a33c64d9e565dc8c4c3ed774f05c0e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53b21bc2df6e8ed538bceda93a5104a5fe6a8a84"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ec454dcd00ce3375119111c6394964455b36d0d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8fe3d6717f5536793727e60b7a0b7ec20c697def"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98934 (GCVE-0-2026-98934)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:11 – Updated: 2026-10-23 12:11

Title

ipv6: sr: use skb_get_hash_net() in seg6_make_flowlabel()

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

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7063 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/4ab37e4f4a33c64d9…
https://git.kernel.org/stable/c/8fe3d6717f5536793…
https://git.kernel.org/stable/c/53b21bc2df6e8ed53…
https://git.kernel.org/stable/c/086e8acb3a0e55f6d…
https://git.kernel.org/stable/c/8ec454dcd00ce3375…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 , < 4ab37e4f4a33c64d9e565dc8c4c3ed774f05c0e3 (git) Affected: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 , < 8fe3d6717f5536793727e60b7a0b7ec20c697def (git) Affected: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 , < 53b21bc2df6e8ed538bceda93a5104a5fe6a8a84 (git) Affected: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 , < 086e8acb3a0e55f6d22d29fae2a4a3b1561bb766 (git) Affected: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 , < 8ec454dcd00ce3375119111c6394964455b36d0d (git)
Linux	Linux	Affected: 4.20 Unaffected: 0 , < 4.20 (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.56 , ≤ 6.18.* (semver) Unaffected: 7.2.10 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
  "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-\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": "2026-10-23T12:11:43.459Z",
        "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"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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