# CVE-2026-68322: rds: Fix inet6_addr_lst NULL dereference when IPv6 is disabled

Status: published. Published: 2026-08-10. Updated: 2026-11-06.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ eee2fa6ab3225192d6d894c54a6fb02ac9efdff6; < 7809344be3f0c1bbfdfdde1cefafeec14bf52d51 (affected, git); ≥ eee2fa6ab3225192d6d894c54a6fb02ac9efdff6; < 438dec9b0a06bd1f8db8c58539c655e735e17367 (affected, git); ≥ eee2fa6ab3225192d6d894c54a6fb02ac9efdff6; < b61c9eb5931bb7389bc104faacd8c17d910da65d (affected, git); ≥ eee2fa6ab3225192d6d894c54a6fb02ac9efdff6; < 8e48d7ab1e01936a172ff31531904b003895fd8c (affected, git); ≥ eee2fa6ab3225192d6d894c54a6fb02ac9efdff6; < a8302e758050e6a922765aee8d220a4fd350f52d (affected, git); ≥ eee2fa6ab3225192d6d894c54a6fb02ac9efdff6; < f6787fdffcae5490c779f0f3f33b11597525d1ae (affected, git); ≥ eee2fa6ab3225192d6d894c54a6fb02ac9efdff6; < 00d5707217b5972554898ff734ae7b71bce704e6 (affected, git); ≥ eee2fa6ab3225192d6d894c54a6fb02ac9efdff6; < 9c805e592a29be9e4e61ff1bd567da04aa8fd6f9 (affected, git). Source: CNA: Linux
- Linux / Linux: 4.19 (affected); ≥ 0; < 4.19 (unaffected, semver); ≥ 5.10.265; ≤ 5.10.* (unaffected, semver); ≥ 5.15.216; ≤ 5.15.* (unaffected, semver); ≥ 6.1.183; ≤ 6.1.* (unaffected, semver); ≥ 6.6.151; ≤ 6.6.* (unaffected, semver); ≥ 6.12.103; ≤ 6.12.* (unaffected, semver); ≥ 6.18.44; ≤ 6.18.* (unaffected, semver); ≥ 7.1.6; ≤ 7.1.* (unaffected, semver); ≥ 7.2; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.22% as of 2026-11-06; percentile 12.14%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/7809344be3f0c1bbfdfdde1cefafeec14bf52d51 (CNA: Linux)

- https://git.kernel.org/stable/c/438dec9b0a06bd1f8db8c58539c655e735e17367 (CNA: Linux)

- https://git.kernel.org/stable/c/b61c9eb5931bb7389bc104faacd8c17d910da65d (CNA: Linux)

- https://git.kernel.org/stable/c/8e48d7ab1e01936a172ff31531904b003895fd8c (CNA: Linux)

- https://git.kernel.org/stable/c/a8302e758050e6a922765aee8d220a4fd350f52d (CNA: Linux)

- https://git.kernel.org/stable/c/f6787fdffcae5490c779f0f3f33b11597525d1ae (CNA: Linux)

- https://git.kernel.org/stable/c/00d5707217b5972554898ff734ae7b71bce704e6 (CNA: Linux)

- https://git.kernel.org/stable/c/9c805e592a29be9e4e61ff1bd567da04aa8fd6f9 (CNA: Linux)

- https://git.kernel.org/stable/c/00d5707217b5972554898ff734ae7b71bce704e6 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/438dec9b0a06bd1f8db8c58539c655e735e17367 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/7809344be3f0c1bbfdfdde1cefafeec14bf52d51 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/8e48d7ab1e01936a172ff31531904b003895fd8c (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/9c805e592a29be9e4e61ff1bd567da04aa8fd6f9 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/a8302e758050e6a922765aee8d220a4fd350f52d (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/b61c9eb5931bb7389bc104faacd8c17d910da65d (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/f6787fdffcae5490c779f0f3f33b11597525d1ae (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-68322; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68322; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-68322; retrieved 2026-11-06; source updated Not reported

Revision: eea46b2edf3e4cb22768771c317103dd51dceacefafcdf60aca58b7d1c3b99d5

Canonical: https://y2.dev/cve/CVE-2026-68322

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