{"cve":"CVE-2026-23381","nvd":{"published":"2026-03-25T11:16:38.160","modified":"2026-10-15T02:18:53.570","status":"Modified","description":"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 'ipv6.disable=1' 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->nd_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  <IRQ>\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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/20ef5c25422f97dd09d751e5ae6c18406cdc78e6","https://git.kernel.org/stable/c/33dec6f10777d5a8f71c0a200f690da5ae3c2e55","https://git.kernel.org/stable/c/7a894eb5de246d79f13105c55a67381039a24d44","https://git.kernel.org/stable/c/a12cdaa3375f0bd3c8f4e564be7c143529abfe5b","https://git.kernel.org/stable/c/a5c56e65b685360dd3f2278aeff8c21061feb665"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-23381","score":0.00125,"percentile":0.02158,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}