CVE-2026-74563rds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check()

Official description

In the Linux kernel, the following vulnerability has been resolved: rds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check() rds_tcp_laddr_check() looks up a scoped IPv6 interface with dev_get_by_index_rcu(), drops the RCU read-side lock, and only then passes the bare struct net_device * into ipv6_chk_addr(). dev_get_by_index_rcu() only keeps the device alive within the same RCU read-side section. After rcu_read_unlock(), a concurrent RTM_DELLINK can free the net_device; ipv6_chk_addr() then dereferences the stale pointer in __ipv6_chk_addr_and_flags() (e.g. l3mdev_master_dev_rcu(dev)), reading freed memory. Keep the RCU read-side lock held across the ipv6_chk_addr() call instead of dropping it right after the lookup, so the device cannot be freed while it is in use. BUG: KASAN: slab-use-after-free in __ipv6_chk_addr_and_flags (... net/ipv6/addrconf.c:1998) Read of size 8 at addr ffff8880106ec000 by task exploit/153 Call Trace: ... kasan_report (mm/kasan/report.c:595) __ipv6_chk_addr_and_flags (... net/ipv6/addrconf.c:1998) ipv6_chk_addr (net/ipv6/addrconf.c:2031 net/ipv6/addrconf.c:1972) rds_tcp_laddr_check (net/rds/tcp.c:370) rds_bind (net/rds/bind.c:248) __sys_bind (net/socket.c:1920) __x64_sys_bind (net/socket.c:1956) do_syscall_64 (arch/x86/entry/syscall_64.c:63) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/f8a8977af2134a1d91e5f9773cb7d9d53278c830
• https://git.kernel.org/stable/c/ba95bce5dfe6e2ef602a87e0557225f2934ccb5c
• https://git.kernel.org/stable/c/c4933624a6f416ecfcc31ab58d585da1207a0597
• https://git.kernel.org/stable/c/76dd48886eeeb5fcf2b837d2f4c3d17eebeac9ef
• https://git.kernel.org/stable/c/f0d1fb05d70c8a561cd8d0473bcacafa2fc137ff
• https://git.kernel.org/stable/c/b1d480fce05f857dc438080cd8c9244b84a83494
• https://git.kernel.org/stable/c/8398bc477d3cb3e2b018a5aaac2bec0f69acda30
• https://git.kernel.org/stable/c/78f75d632f74b8de0f081a128588f7c37d0d1164