In the Linux kernel, the following vulnerability has been resolved: ipv6: ndisc: fix NULL deref in accept_untracked_na() accept_untracked_na() re-fetches the inet6_dev with __in6_dev_get(dev) and dereferences idev->cnf.accept_untracked_na without a NULL check, even though its only caller ndisc_recv_na() already fetched and NULL-checked idev for the same device. Both reads of dev->ip6_ptr run in the same RCU read-side critical section, but a concurrent addrconf_ifdown() can clear dev->ip6_ptr between them: lowering the MTU below IPV6_MIN_MTU calls addrconf_ifdown() without the synchronize_net() that orders the unregister path, so the re-fetch returns NULL and oopses: BUG: KASAN: null-ptr-deref in ndisc_recv_na (net/ipv6/ndisc.c:974) Read of size 4 at addr 0000000000000364 Call Trace: <IRQ> ndisc_recv_na (net/ipv6/ndisc.c:974) icmpv6_rcv (net/ipv6/icmp.c:1193) ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:479) ip6_input_finish (net/ipv6/ip6_input.c:534) ip6_input (net/ipv6/ip6_input.c:545) ip6_mc_input (net/ipv6/ip6_input.c:635) ipv6_rcv (net/ipv6/ip6_input.c:351) </IRQ> It is reachable by an unprivileged user via a network namespace. Pass the caller's already validated idev instead of re-fetching it; the idev stays alive for the whole RCU critical section, so it is safe even after dev->ip6_ptr has been cleared.

A flaw was found in the Linux kernel's IPv6 Neighbor Discovery (NDISC) component. An unprivileged user, operating within a network namespace, can trigger a null pointer dereference in the `accept_untracked_na()` function. This occurs due to a race condition where the `inet6_dev` structure is re-fetched without a null check, while another process concurrently clears the device's IPv6 pointer. Successful exploitation of this vulnerability leads to a kernel crash, resulting in a Denial of Service (DoS).

This Moderate impact flaw in the Linux kernel's IPv6 Neighbor Discovery (NDISC) protocol can lead to a kernel panic, resulting in a denial of service. An unprivileged local attacker can trigger this NULL pointer dereference within a network namespace, impacting system availability. Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Red Hat Enterprise Linux 10 Will not fix kernel Red Hat Enterprise Linux 6 Will not fix kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Not affected kernel Red Hat Enterprise Linux 9 Not affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-64542 https://nvd.nist.gov/vuln/detail/CVE-2026-64542 https://lore.kernel.org/linux-cve-announce/2026072736-CVE-2026-64542-fe95@gregkh/T