CVE-2026-23381
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
net: bridge: fix nd_tbl NULL dereference when IPv6 is disabled
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| ed842faeb2bd49256f00485402f3113205f91d30 | affected | git | a9d712ccfeef737c0e700a4b5b98f310e07b6b60 | Unavailable | None listed |
| ed842faeb2bd49256f00485402f3113205f91d30 | affected | git | a5c56e65b685360dd3f2278aeff8c21061feb665 | Unavailable | None listed |
| ed842faeb2bd49256f00485402f3113205f91d30 | affected | git | 7a894eb5de246d79f13105c55a67381039a24d44 | Unavailable | None listed |
| ed842faeb2bd49256f00485402f3113205f91d30 | affected | git | a12cdaa3375f0bd3c8f4e564be7c143529abfe5b | Unavailable | None listed |
| ed842faeb2bd49256f00485402f3113205f91d30 | affected | git | aa73deb3b6b730ec280d45b3f423bfa9e17bc122 | Unavailable | None listed |
| ed842faeb2bd49256f00485402f3113205f91d30 | affected | git | 33dec6f10777d5a8f71c0a200f690da5ae3c2e55 | Unavailable | None listed |
| ed842faeb2bd49256f00485402f3113205f91d30 | affected | git | 20ef5c25422f97dd09d751e5ae6c18406cdc78e6 | Unavailable | None listed |
| ed842faeb2bd49256f00485402f3113205f91d30 | affected | git | e5e890630533bdc15b26a34bb8e7ef539bdf1322 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.15 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.15 | Unavailable | None listed |
| 5.10.253 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.203 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.167 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.130 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.77 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.17 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 6.19.7 | unaffected | semver | Unavailable | 6.19.* | None listed |
| 7.0 | unaffected | original_commit_for_fix | Unavailable | * | None listed |