Vulnerability-Lookup

GHSA-48Q6-HPWM-MQH2

Vulnerability from github – Published: 2026-05-27 12:31 – Updated: 2026-05-27 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()

bareudp_fill_metadata_dst() passes bareudp->sock to udp_tunnel6_dst_lookup() in the IPv6 path without a NULL check. The socket is only created in bareudp_open() and NULLed in bareudp_stop(), so calling this function while the device is down triggers a NULL dereference via sock->sk.

BUG: kernel NULL pointer dereference, address: 0000000000000018 RIP: 0010:udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:160) Call Trace: bareudp_fill_metadata_dst (drivers/net/bareudp.c:532) do_execute_actions (net/openvswitch/actions.c:901) ovs_execute_actions (net/openvswitch/actions.c:1589) ovs_packet_cmd_execute (net/openvswitch/datapath.c:700) genl_family_rcv_msg_doit (net/netlink/genetlink.c:1114) genl_rcv_msg (net/netlink/genetlink.c:1209) netlink_rcv_skb (net/netlink/af_netlink.c:2550)

Add a NULL check returning -ESHUTDOWN, consistent with the xmit paths in the same driver.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-45846"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T11:16:24Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()\n\nbareudp_fill_metadata_dst() passes bareudp-\u003esock to\nudp_tunnel6_dst_lookup() in the IPv6 path without a NULL check.\nThe socket is only created in bareudp_open() and NULLed in\nbareudp_stop(), so calling this function while the device is down\ntriggers a NULL dereference via sock-\u003esk.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000018\n RIP: 0010:udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:160)\n Call Trace:\n  \u003cTASK\u003e\n  bareudp_fill_metadata_dst (drivers/net/bareudp.c:532)\n  do_execute_actions (net/openvswitch/actions.c:901)\n  ovs_execute_actions (net/openvswitch/actions.c:1589)\n  ovs_packet_cmd_execute (net/openvswitch/datapath.c:700)\n  genl_family_rcv_msg_doit (net/netlink/genetlink.c:1114)\n  genl_rcv_msg (net/netlink/genetlink.c:1209)\n  netlink_rcv_skb (net/netlink/af_netlink.c:2550)\n  \u003c/TASK\u003e\n\nAdd a NULL check returning -ESHUTDOWN, consistent with the xmit paths\nin the same driver.",
  "id": "GHSA-48q6-hpwm-mqh2",
  "modified": "2026-05-27T12:31:24Z",
  "published": "2026-05-27T12:31:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45846"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35a115a204be08f97450b0389413e218268ef4a2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/638905520fc4fae6a80991563f264131545ba3df"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/74a02921c48fcd35a7881956c9e5c52b86595f5d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0f4e4e8e0f5e24ddd83e3d1221732621cf34636"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa6c6d9ee064aabfede4402fd1283424e649ca19"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-45846 (GCVE-0-2026-45846)

Vulnerability from cvelistv5 – Published: 2026-05-27 09:24 – Updated: 2026-05-27 09:24

Title

bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()

Summary

In the Linux kernel, the following vulnerability has been resolved: bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst() bareudp_fill_metadata_dst() passes bareudp->sock to udp_tunnel6_dst_lookup() in the IPv6 path without a NULL check. The socket is only created in bareudp_open() and NULLed in bareudp_stop(), so calling this function while the device is down triggers a NULL dereference via sock->sk. BUG: kernel NULL pointer dereference, address: 0000000000000018 RIP: 0010:udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:160) Call Trace: <TASK> bareudp_fill_metadata_dst (drivers/net/bareudp.c:532) do_execute_actions (net/openvswitch/actions.c:901) ovs_execute_actions (net/openvswitch/actions.c:1589) ovs_packet_cmd_execute (net/openvswitch/datapath.c:700) genl_family_rcv_msg_doit (net/netlink/genetlink.c:1114) genl_rcv_msg (net/netlink/genetlink.c:1209) netlink_rcv_skb (net/netlink/af_netlink.c:2550) </TASK> Add a NULL check returning -ESHUTDOWN, consistent with the xmit paths in the same driver.

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/a0f4e4e8e0f5e24dd…
https://git.kernel.org/stable/c/35a115a204be08f97…
https://git.kernel.org/stable/c/74a02921c48fcd35a…
https://git.kernel.org/stable/c/638905520fc4fae6a…
https://git.kernel.org/stable/c/aa6c6d9ee064aabfe…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 571912c69f0ed731bd1e071ade9dc7ca4aa52065 , < a0f4e4e8e0f5e24ddd83e3d1221732621cf34636 (git) Affected: 571912c69f0ed731bd1e071ade9dc7ca4aa52065 , < 35a115a204be08f97450b0389413e218268ef4a2 (git) Affected: 571912c69f0ed731bd1e071ade9dc7ca4aa52065 , < 74a02921c48fcd35a7881956c9e5c52b86595f5d (git) Affected: 571912c69f0ed731bd1e071ade9dc7ca4aa52065 , < 638905520fc4fae6a80991563f264131545ba3df (git) Affected: 571912c69f0ed731bd1e071ade9dc7ca4aa52065 , < aa6c6d9ee064aabfede4402fd1283424e649ca19 (git)
Linux	Linux	Affected: 5.7 Unaffected: 0 , < 5.7 (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1-rc2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/bareudp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a0f4e4e8e0f5e24ddd83e3d1221732621cf34636",
              "status": "affected",
              "version": "571912c69f0ed731bd1e071ade9dc7ca4aa52065",
              "versionType": "git"
            },
            {
              "lessThan": "35a115a204be08f97450b0389413e218268ef4a2",
              "status": "affected",
              "version": "571912c69f0ed731bd1e071ade9dc7ca4aa52065",
              "versionType": "git"
            },
            {
              "lessThan": "74a02921c48fcd35a7881956c9e5c52b86595f5d",
              "status": "affected",
              "version": "571912c69f0ed731bd1e071ade9dc7ca4aa52065",
              "versionType": "git"
            },
            {
              "lessThan": "638905520fc4fae6a80991563f264131545ba3df",
              "status": "affected",
              "version": "571912c69f0ed731bd1e071ade9dc7ca4aa52065",
              "versionType": "git"
            },
            {
              "lessThan": "aa6c6d9ee064aabfede4402fd1283424e649ca19",
              "status": "affected",
              "version": "571912c69f0ed731bd1e071ade9dc7ca4aa52065",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/bareudp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "lessThan": "5.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.141",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1-rc2",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()\n\nbareudp_fill_metadata_dst() passes bareudp-\u003esock to\nudp_tunnel6_dst_lookup() in the IPv6 path without a NULL check.\nThe socket is only created in bareudp_open() and NULLed in\nbareudp_stop(), so calling this function while the device is down\ntriggers a NULL dereference via sock-\u003esk.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000018\n RIP: 0010:udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:160)\n Call Trace:\n  \u003cTASK\u003e\n  bareudp_fill_metadata_dst (drivers/net/bareudp.c:532)\n  do_execute_actions (net/openvswitch/actions.c:901)\n  ovs_execute_actions (net/openvswitch/actions.c:1589)\n  ovs_packet_cmd_execute (net/openvswitch/datapath.c:700)\n  genl_family_rcv_msg_doit (net/netlink/genetlink.c:1114)\n  genl_rcv_msg (net/netlink/genetlink.c:1209)\n  netlink_rcv_skb (net/netlink/af_netlink.c:2550)\n  \u003c/TASK\u003e\n\nAdd a NULL check returning -ESHUTDOWN, consistent with the xmit paths\nin the same driver."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T09:24:52.122Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a0f4e4e8e0f5e24ddd83e3d1221732621cf34636"
        },
        {
          "url": "https://git.kernel.org/stable/c/35a115a204be08f97450b0389413e218268ef4a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/74a02921c48fcd35a7881956c9e5c52b86595f5d"
        },
        {
          "url": "https://git.kernel.org/stable/c/638905520fc4fae6a80991563f264131545ba3df"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa6c6d9ee064aabfede4402fd1283424e649ca19"
        }
      ],
      "title": "bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45846",
    "datePublished": "2026-05-27T09:24:52.122Z",
    "dateReserved": "2026-05-13T15:03:33.078Z",
    "dateUpdated": "2026-05-27T09:24:52.122Z",
    "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.

Detection rules are retrieved from Rulezet.

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GHSA-48Q6-HPWM-MQH2

CVE-2026-45846 (GCVE-0-2026-45846)

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Sightings

Nomenclature