CVE-2026-68322 rds: Fix inet6_addr_lst NULL dereference when IPv6 is disabled
A local attacker can cause a kernel crash by binding an RDS socket to an IPv6 address when IPv6 is disabled via boot parameter.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68322?
CVE-2026-68322 is a vulnerability in Linux, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
rds: Fix inet6_addr_lst NULL dereference when IPv6 is disabled
When booting with the 'ipv6.disable=1' parameter, inet6_addr_lst is never initialized because inet6_init() exits before addrconf_init() is called to initialize it. An attempt to bind an RDS socket to an ipv6 address results in a crash in __ipv6_chk_addr_and_flags()
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] RIP: 0010:__ipv6_chk_addr_and_flags+0x1df/0x7e0 Call Trace: <TASK> ipv6_chk_addr+0x3b/0x50 rds_tcp_laddr_check+0x155/0x3b0 [rds_tcp] rds_trans_get_preferred+0x15d/0x2d0 [rds] ? trace_hardirqs_on+0x2d/0x110 rds_bind+0x1433/0x1d60 [rds] ? rds_remove_bound+0xd50/0xd50 [rds] ? aa_af_perm+0x250/0x250 ? __might_fault+0xde/0x190 ? __sys_bind+0x1dc/0x210 __sys_bind+0x1dc/0x210 ? __ia32_sys_socketpair+0x100/0x100 ? restore_fpregs_from_fpstate+0x53/0x100 __x64_sys_bind+0x73/0xb0 ? syscall_enter_from_user_mode+0x1c/0x50 do_syscall_64+0x34/0x80 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 RIP: 0033:0x7f47f8269ea9 </TASK>
The following code reproduces the issue:
struct sockaddr_in6 addr; s = socket(PF_RDS, SOCK_SEQPACKET, 0);
memset(&addr, 0, sizeof(addr)); inet_pton(AF_INET6, ADDRESS, &addr.sin6_addr); addr.sin6_family = AF_INET6; addr.sin6_port = htons(PORT);
bind(s, &addr, sizeof(addr));
Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with Syzkaller.
Which versions are affected by CVE-2026-68322?
How do I fix CVE-2026-68322?
Apply the vendor's patch.
Is CVE-2026-68322 being exploited?
There is no known exploitation of CVE-2026-68322 in the wild and no public exploit code.
Sources
Also known as AZL-95117, BELL-CVE-2026-68322, DEBIAN-CVE-2026-68322, GHSA-jpvq-8j5f-x4hh, UBUNTU-CVE-2026-68322.