CVE-2026-68322

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.