Medium [CVE-2026-68336] fix devconf_all NULL dereference when IPv6 is disabled
This medium-severity Red Hat Linux advisory covers CVE-2026-68336 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 9.
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Summary
In the Linux kernel, the following vulnerability has been resolved: bonding: fix devconf_all NULL dereference when IPv6 is disabled When booting with the 'ipv6.disable=1' parameter, the devconf_all is never initialized because inet6_init() exits before addrconf_init() is called which initializes it. bond_send_validate(), however, will still call bond_ns_send_all() even ipv6 is indeed disabled.
It will lead to NULL derefence of net->ipv6.devconf_all in ip6_pol_route().
BUG: kernel NULL pointer dereference, address: 000000000000000c [...] Workqueue: bond0 bond_arp_monitor [bonding] RIP: 0010:ip6_pol_route+0x69/0x480 [...] Call Trace:? srso_return_thunk+0x5/0x5f? __pfx_ip6_pol_route_output+0x10/0x10 fib6_rule_lookup+0xfe/0x260? wakeup_preempt+0x8a/0x90? srso_return_thunk+0x5/0x5f? srso_return_thunk+0x5/0x5f? sched_balance_rq+0x369/0x810 ip6_route_output_flags+0xd7/0x170 bond_ns_send_all+0xde/0x280 [bonding] bond_ab_arp_probe+0x296/0x320 [bonding]? srso_return_thunk+0x5/0x5f bond_activebackup_arp_mon+0xb4/0x2c0 [bonding] process_one_work+0x196/0x370 worker_thread+0x1af/0x320? srso_return_thunk+0x5/0x5f? __pfx_worker_thread+0x10/0x10 kthread+0xe3/0x120? __pfx_kthread+0x10/0x10 ret_from_fork+0x199/0x260? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 Fix this by adding ipv6_mod_enabled() condition check in the caller.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 2 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 2 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 2 days ago·verify at source
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