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

Vulnerability from cvelistv5 – Published: 2026-03-25 10:28 – Updated: 2026-09-08 08:45
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 CPE status
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)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bridge/br_device.c\",\"net/bridge/br_input.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ed842faeb2bd49256f00485402f3113205f91d30\",\"lessThan\":\"a9d712ccfeef737c0e700a4b5b98f310e07b6b60\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed842faeb2bd49256f00485402f3113205f91d30\",\"lessThan\":\"a5c56e65b685360dd3f2278aeff8c21061feb665\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed842faeb2bd49256f00485402f3113205f91d30\",\"lessThan\":\"7a894eb5de246d79f13105c55a67381039a24d44\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed842faeb2bd49256f00485402f3113205f91d30\",\"lessThan\":\"a12cdaa3375f0bd3c8f4e564be7c143529abfe5b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed842faeb2bd49256f00485402f3113205f91d30\",\"lessThan\":\"aa73deb3b6b730ec280d45b3f423bfa9e17bc122\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed842faeb2bd49256f00485402f3113205f91d30\",\"lessThan\":\"33dec6f10777d5a8f71c0a200f690da5ae3c2e55\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed842faeb2bd49256f00485402f3113205f91d30\",\"lessThan\":\"20ef5c25422f97dd09d751e5ae6c18406cdc78e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed842faeb2bd49256f00485402f3113205f91d30\",\"lessThan\":\"e5e890630533bdc15b26a34bb8e7ef539bdf1322\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bridge/br_device.c\",\"net/bridge/br_input.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.253\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.203\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.167\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.130\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.77\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.17\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.7\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC 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MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"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\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T14:58:54+00:00",
      "cve": "CVE-2026-23381",
      "id": "CVE-2026-23381",
      "initial_release_date": "2026-03-25T00:00:00+00:00",
      "product_status:fixed": "13",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: bridge: fix nd_tbl NULL dereference when IPv6 is disabled",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23381.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:36:41Z",
      "cve": "CVE-2026-23381",
      "id": "CVE-2026-23381",
      "initial_release_date": "2026-03-25T16:55:07Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "561",
      "product_status:known_not_affected": "153",
      "product_status:recommended": "311",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23381",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23381.json",
      "version": "37"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.