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

Vulnerability from cvelistv5 – Published: 2026-03-25 10:28 – Updated: 2026-05-11 22:05
VLAI
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < a9d712ccfeef737c0e700a4b5b98f310e07b6b60 (git)
Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < a5c56e65b685360dd3f2278aeff8c21061feb665 (git)
Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < 7a894eb5de246d79f13105c55a67381039a24d44 (git)
Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < a12cdaa3375f0bd3c8f4e564be7c143529abfe5b (git)
Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < aa73deb3b6b730ec280d45b3f423bfa9e17bc122 (git)
Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < 33dec6f10777d5a8f71c0a200f690da5ae3c2e55 (git)
Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < 20ef5c25422f97dd09d751e5ae6c18406cdc78e6 (git)
Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < e5e890630533bdc15b26a34bb8e7ef539bdf1322 (git)
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Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (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 , ≤ * (original_commit_for_fix)
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          "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": "2026-05-11T22:05:46.570Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/e5e890630533bdc15b26a34bb8e7ef539bdf1322"
        }
      ],
      "title": "net: bridge: fix nd_tbl NULL dereference when IPv6 is disabled",
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    "cveId": "CVE-2026-23381",
    "datePublished": "2026-03-25T10:28:00.416Z",
    "dateReserved": "2026-01-13T15:37:46.007Z",
    "dateUpdated": "2026-05-11T22:05:46.570Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-23381",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23381\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:38.160\",\"lastModified\":\"2026-04-24T18:41:47.693\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nnet: bridge: corrige la desreferencia NULL de nd_tbl cuando IPv6 est\u00e1 deshabilitado\\n\\nAl arrancar con el par\u00e1metro \u0027ipv6.disable=1\u0027, el nd_tbl nunca se inicializa porque inet6_init() sale antes de que se llame a ndisc_init(), que es quien lo inicializa. Luego, si neigh_suppress est\u00e1 habilitado y un paquete ICMPv6 Neighbor Discovery llega al puente, br_do_suppress_nd() desreferenciar\u00e1 ipv6_stub-\u0026gt;nd_tbl, que es NULL, pas\u00e1ndolo a neigh_lookup(). Esto causa una desreferencia de puntero NULL del kernel.\\n\\n BUG: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000268\\n Oops: 0000 [#1] PREEMPT SMP NOPTI\\n [...]\\n RIP: 0010:neigh_lookup+0x16/0xe0\\n [...]\\n Rastro de Llamada:\\n  \\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\\nSoluciona esto reemplazando la llamada a IS_ENABLED(IPV6) con ipv6_mod_enabled() en los llamadores. Esto es, en esencia, deshabilitar la supresi\u00f3n de NS/NA cuando IPv6 est\u00e1 deshabilitado.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15.1\",\"versionEndExcluding\":\"5.10.253\",\"matchCriteriaId\":\"B17827E3-86FD-498B-B936-E57F1C08BF4A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.203\",\"matchCriteriaId\":\"20DDB3E9-AABF-4107-ADB0-5362AA067045\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.167\",\"matchCriteriaId\":\"2EDC6BAF-B710-4E26-B6AA-D68922EE7B43\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.130\",\"matchCriteriaId\":\"C57BB918-DF28-46B3-94F7-144176841267\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.77\",\"matchCriteriaId\":\"B3D12E00-E42D-4056-B354-BAD4903C03A5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.17\",\"matchCriteriaId\":\"A5E006E4-59C7-43C1-9231-62A72219F2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.7\",\"matchCriteriaId\":\"69245D10-0B71-485E-80C3-A64F077004D3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.15:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"3B4D39AF-668B-442B-8085-639A6D4FA5AC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F253B622-8837-4245-BCE5-A7BF8FC76A16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F666C8D8-6538-46D4-B318-87610DE64C34\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"02259FDA-961B-47BC-AE7F-93D7EC6E90C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"58A9FEFF-C040-420D-8F0A-BFDAAA1DF258\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"1D2315C0-D46F-4F85-9754-F9E5E11374A6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"512EE3A8-A590-4501-9A94-5D4B268D6138\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/20ef5c25422f97dd09d751e5ae6c18406cdc78e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/33dec6f10777d5a8f71c0a200f690da5ae3c2e55\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7a894eb5de246d79f13105c55a67381039a24d44\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a12cdaa3375f0bd3c8f4e564be7c143529abfe5b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a5c56e65b685360dd3f2278aeff8c21061feb665\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a9d712ccfeef737c0e700a4b5b98f310e07b6b60\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/aa73deb3b6b730ec280d45b3f423bfa9e17bc122\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e5e890630533bdc15b26a34bb8e7ef539bdf1322\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.