CVE-2026-68322
rds: Fix inet6_addr_lst NULL dereference when IPv6 is disabled
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| 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) Other versions: unaffected |
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) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/7809344be3f0c1bbfdfdde1cefafeec14bf52d51CNA: Linux
- https://git.kernel.org/stable/c/438dec9b0a06bd1f8db8c58539c655e735e17367CNA: Linux
- https://git.kernel.org/stable/c/b61c9eb5931bb7389bc104faacd8c17d910da65dCNA: Linux
- https://git.kernel.org/stable/c/8e48d7ab1e01936a172ff31531904b003895fd8cCNA: Linux
- https://git.kernel.org/stable/c/a8302e758050e6a922765aee8d220a4fd350f52dCNA: Linux
- https://git.kernel.org/stable/c/f6787fdffcae5490c779f0f3f33b11597525d1aeCNA: Linux
- https://git.kernel.org/stable/c/00d5707217b5972554898ff734ae7b71bce704e6CNA: Linux
- https://git.kernel.org/stable/c/9c805e592a29be9e4e61ff1bd567da04aa8fd6f9CNA: Linux
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