FKIE_CVE-2026-23381
Vulnerability from fkie_nvd - Published: 2026-03-25 11:16 - Updated: 2026-04-24 18:41
Severity ?
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.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 4.15 | |
| linux | linux_kernel | 7.0 | |
| linux | linux_kernel | 7.0 | |
| linux | linux_kernel | 7.0 | |
| linux | linux_kernel | 7.0 | |
| linux | linux_kernel | 7.0 | |
| linux | linux_kernel | 7.0 | |
| linux | linux_kernel | 7.0 |
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"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."
}
],
"id": "CVE-2026-23381",
"lastModified": "2026-04-24T18:41:47.693",
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"source": "nvd@nist.gov",
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"published": "2026-03-25T11:16:38.160",
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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.
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