# CVE-2022-49662: ipv6: fix lockdep splat in in6_dump_addrs()

Status: published. Published: 2025-02-26. Updated: 2026-11-05.

In the Linux kernel, the following vulnerability has been resolved:

ipv6: fix lockdep splat in in6_dump_addrs()

As reported by syzbot, we should not use rcu_dereference()
when rcu_read_lock() is not held.

WARNING: suspicious RCU usage
5.19.0-rc2-syzkaller #0 Not tainted

net/ipv6/addrconf.c:5175 suspicious rcu_dereference_check() usage!

other info that might help us debug this:

rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syz-executor326/3617:
 #0: ffffffff8d5848e8 (rtnl_mutex){+.+.}-{3:3}, at: netlink_dump+0xae/0xc20 net/netlink/af_netlink.c:2223

stack backtrace:
CPU: 0 PID: 3617 Comm: syz-executor326 Not tainted 5.19.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 in6_dump_addrs+0x12d1/0x1790 net/ipv6/addrconf.c:5175
 inet6_dump_addr+0x9c1/0xb50 net/ipv6/addrconf.c:5300
 netlink_dump+0x541/0xc20 net/netlink/af_netlink.c:2275
 __netlink_dump_start+0x647/0x900 net/netlink/af_netlink.c:2380
 netlink_dump_start include/linux/netlink.h:245 [inline]
 rtnetlink_rcv_msg+0x73e/0xc90 net/core/rtnetlink.c:6046
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2501
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 ____sys_sendmsg+0x6eb/0x810 net/socket.c:2492
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546
 __sys_sendmsg net/socket.c:2575 [inline]
 __do_sys_sendmsg net/socket.c:2584 [inline]
 __se_sys_sendmsg net/socket.c:2582 [inline]
 __x64_sys_sendmsg+0x132/0x220 net/socket.c:2582
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 676457fe5ad19517a8b21d1c3f4d23512118f6a3; < ea18594da69a09f68491da57f9fa09f003efbbc7 (affected, git); ≥ 88e2ca3080947fe22eb520c1f8231e79a105d011; < 2930ee1a166df0e12fe9fec4b79cc3dc9634ae45 (affected, git); ≥ 88e2ca3080947fe22eb520c1f8231e79a105d011; < b39fda51c32dd879451e0119881f31493bf83283 (affected, git); ≥ 88e2ca3080947fe22eb520c1f8231e79a105d011; < 4e43e64d0f1332fcc503babad4dc31aead7131ca (affected, git). Source: CNA: Linux
- Linux / Linux: 5.13 (affected); ≥ 0; < 5.13 (unaffected, semver); ≥ 5.15.53; ≤ 5.15.* (unaffected, semver); ≥ 5.18.10; ≤ 5.18.* (unaffected, semver); ≥ 5.19; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.27% as of 2026-11-05; percentile 20.08%

- 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/ea18594da69a09f68491da57f9fa09f003efbbc7 (CNA: Linux)

- https://git.kernel.org/stable/c/2930ee1a166df0e12fe9fec4b79cc3dc9634ae45 (CNA: Linux)

- https://git.kernel.org/stable/c/b39fda51c32dd879451e0119881f31493bf83283 (CNA: Linux)

- https://git.kernel.org/stable/c/4e43e64d0f1332fcc503babad4dc31aead7131ca (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2022-49662; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2022-49662; retrieved 2026-11-05; source updated Not reported

Revision: c66619bf5cb6fd5ed4af1c561b7855ca9bb785fd57d6ea48d01bff179c37784a

Canonical: https://y2.dev/cve/CVE-2022-49662

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