Vulnerability-Lookup

GHSA-VM87-VMVC-9C38

Vulnerability from github – Published: 2026-03-25 12:30 – Updated: 2026-03-25 12:30

Details

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

net: bridge: fix nd_tbl NULL dereference when IPv6 is disabled

When booting with the 'ipv6.disable=1' parameter, the nd_tbl is never initialized because inet6_init() exits before ndisc_init() is called which initializes it. Then, if neigh_suppress is enabled and an ICMPv6 Neighbor Discovery packet reaches the bridge, br_do_suppress_nd() will dereference ipv6_stub->nd_tbl which is NULL, passing it to neigh_lookup(). This causes a kernel NULL pointer dereference.

BUG: kernel NULL pointer dereference, address: 0000000000000268 Oops: 0000 [#1] PREEMPT SMP NOPTI [...] RIP: 0010:neigh_lookup+0x16/0xe0 [...] Call Trace: ? neigh_lookup+0x16/0xe0 br_do_suppress_nd+0x160/0x290 [bridge] br_handle_frame_finish+0x500/0x620 [bridge] br_handle_frame+0x353/0x440 [bridge] __netif_receive_skb_core.constprop.0+0x298/0x1110 __netif_receive_skb_one_core+0x3d/0xa0 process_backlog+0xa0/0x140 __napi_poll+0x2c/0x170 net_rx_action+0x2c4/0x3a0 handle_softirqs+0xd0/0x270 do_softirq+0x3f/0x60

Fix this by replacing IS_ENABLED(IPV6) call with ipv6_mod_enabled() in the callers. This is in essence disabling NS/NA suppression when IPv6 is disabled.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23381"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-25T11:16:38Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: fix nd_tbl NULL dereference when IPv6 is disabled\n\nWhen booting with the \u0027ipv6.disable=1\u0027 parameter, the nd_tbl is never\ninitialized because inet6_init() exits before ndisc_init() is called\nwhich initializes it. Then, if neigh_suppress is enabled and an ICMPv6\nNeighbor Discovery packet reaches the bridge, br_do_suppress_nd() will\ndereference ipv6_stub-\u003end_tbl which is NULL, passing it to\nneigh_lookup(). This causes a kernel NULL pointer dereference.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000268\n Oops: 0000 [#1] PREEMPT SMP NOPTI\n [...]\n RIP: 0010:neigh_lookup+0x16/0xe0\n [...]\n Call Trace:\n  \u003cIRQ\u003e\n  ? neigh_lookup+0x16/0xe0\n  br_do_suppress_nd+0x160/0x290 [bridge]\n  br_handle_frame_finish+0x500/0x620 [bridge]\n  br_handle_frame+0x353/0x440 [bridge]\n  __netif_receive_skb_core.constprop.0+0x298/0x1110\n  __netif_receive_skb_one_core+0x3d/0xa0\n  process_backlog+0xa0/0x140\n  __napi_poll+0x2c/0x170\n  net_rx_action+0x2c4/0x3a0\n  handle_softirqs+0xd0/0x270\n  do_softirq+0x3f/0x60\n\nFix this by replacing IS_ENABLED(IPV6) call with ipv6_mod_enabled() in\nthe callers. This is in essence disabling NS/NA suppression when IPv6 is\ndisabled.",
  "id": "GHSA-vm87-vmvc-9c38",
  "modified": "2026-03-25T12:30:24Z",
  "published": "2026-03-25T12:30:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23381"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/20ef5c25422f97dd09d751e5ae6c18406cdc78e6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/33dec6f10777d5a8f71c0a200f690da5ae3c2e55"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7a894eb5de246d79f13105c55a67381039a24d44"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a12cdaa3375f0bd3c8f4e564be7c143529abfe5b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa73deb3b6b730ec280d45b3f423bfa9e17bc122"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e5e890630533bdc15b26a34bb8e7ef539bdf1322"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-23381 (GCVE-0-2026-23381)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:28 – Updated: 2026-03-25 10:28

Title

net: bridge: fix nd_tbl NULL dereference when IPv6 is disabled

Summary

In the Linux kernel, the following vulnerability has been resolved: net: bridge: fix nd_tbl NULL dereference when IPv6 is disabled When booting with the 'ipv6.disable=1' parameter, the nd_tbl is never initialized because inet6_init() exits before ndisc_init() is called which initializes it. Then, if neigh_suppress is enabled and an ICMPv6 Neighbor Discovery packet reaches the bridge, br_do_suppress_nd() will dereference ipv6_stub->nd_tbl which is NULL, passing it to neigh_lookup(). This causes a kernel NULL pointer dereference. BUG: kernel NULL pointer dereference, address: 0000000000000268 Oops: 0000 [#1] PREEMPT SMP NOPTI [...] RIP: 0010:neigh_lookup+0x16/0xe0 [...] Call Trace: <IRQ> ? neigh_lookup+0x16/0xe0 br_do_suppress_nd+0x160/0x290 [bridge] br_handle_frame_finish+0x500/0x620 [bridge] br_handle_frame+0x353/0x440 [bridge] __netif_receive_skb_core.constprop.0+0x298/0x1110 __netif_receive_skb_one_core+0x3d/0xa0 process_backlog+0xa0/0x140 __napi_poll+0x2c/0x170 net_rx_action+0x2c4/0x3a0 handle_softirqs+0xd0/0x270 do_softirq+0x3f/0x60 Fix this by replacing IS_ENABLED(IPV6) call with ipv6_mod_enabled() in the callers. This is in essence disabling NS/NA suppression when IPv6 is disabled.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/7a894eb5de246d79f…
	https://git.kernel.org/stable/c/a12cdaa3375f0bd3c…
	https://git.kernel.org/stable/c/aa73deb3b6b730ec2…
	https://git.kernel.org/stable/c/33dec6f10777d5a8f…
	https://git.kernel.org/stable/c/20ef5c25422f97dd0…
	https://git.kernel.org/stable/c/e5e890630533bdc15…

Impacted products

Vendor

Product

Version

Linux

Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < 7a894eb5de246d79f13105c55a67381039a24d44 (git)
Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < a12cdaa3375f0bd3c8f4e564be7c143529abfe5b (git)
Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < aa73deb3b6b730ec280d45b3f423bfa9e17bc122 (git)
Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < 33dec6f10777d5a8f71c0a200f690da5ae3c2e55 (git)
Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < 20ef5c25422f97dd09d751e5ae6c18406cdc78e6 (git)
Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < e5e890630533bdc15b26a34bb8e7ef539bdf1322 (git)

Linux

Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bridge/br_device.c",
            "net/bridge/br_input.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7a894eb5de246d79f13105c55a67381039a24d44",
              "status": "affected",
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            },
            {
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            },
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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            {
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              "status": "affected",
              "version": "ed842faeb2bd49256f00485402f3113205f91d30",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bridge/br_device.c",
            "net/bridge/br_input.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.77",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.167",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.6.130",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.77",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.17",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.7",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0-rc3",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: fix nd_tbl NULL dereference when IPv6 is disabled\n\nWhen booting with the \u0027ipv6.disable=1\u0027 parameter, the nd_tbl is never\ninitialized because inet6_init() exits before ndisc_init() is called\nwhich initializes it. Then, if neigh_suppress is enabled and an ICMPv6\nNeighbor Discovery packet reaches the bridge, br_do_suppress_nd() will\ndereference ipv6_stub-\u003end_tbl which is NULL, passing it to\nneigh_lookup(). This causes a kernel NULL pointer dereference.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000268\n Oops: 0000 [#1] PREEMPT SMP NOPTI\n [...]\n RIP: 0010:neigh_lookup+0x16/0xe0\n [...]\n Call Trace:\n  \u003cIRQ\u003e\n  ? neigh_lookup+0x16/0xe0\n  br_do_suppress_nd+0x160/0x290 [bridge]\n  br_handle_frame_finish+0x500/0x620 [bridge]\n  br_handle_frame+0x353/0x440 [bridge]\n  __netif_receive_skb_core.constprop.0+0x298/0x1110\n  __netif_receive_skb_one_core+0x3d/0xa0\n  process_backlog+0xa0/0x140\n  __napi_poll+0x2c/0x170\n  net_rx_action+0x2c4/0x3a0\n  handle_softirqs+0xd0/0x270\n  do_softirq+0x3f/0x60\n\nFix this by replacing IS_ENABLED(IPV6) call with ipv6_mod_enabled() in\nthe callers. This is in essence disabling NS/NA suppression when IPv6 is\ndisabled."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T10:28:00.416Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7a894eb5de246d79f13105c55a67381039a24d44"
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        {
          "url": "https://git.kernel.org/stable/c/a12cdaa3375f0bd3c8f4e564be7c143529abfe5b"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa73deb3b6b730ec280d45b3f423bfa9e17bc122"
        },
        {
          "url": "https://git.kernel.org/stable/c/33dec6f10777d5a8f71c0a200f690da5ae3c2e55"
        },
        {
          "url": "https://git.kernel.org/stable/c/20ef5c25422f97dd09d751e5ae6c18406cdc78e6"
        },
        {
          "url": "https://git.kernel.org/stable/c/e5e890630533bdc15b26a34bb8e7ef539bdf1322"
        }
      ],
      "title": "net: bridge: fix nd_tbl NULL dereference when IPv6 is disabled",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23381",
    "datePublished": "2026-03-25T10:28:00.416Z",
    "dateReserved": "2026-01-13T15:37:46.007Z",
    "dateUpdated": "2026-03-25T10:28:00.416Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-VM87-VMVC-9C38

CVE-2026-23381 (GCVE-0-2026-23381)

Tags

Sightings

Nomenclature