CVE-2026-74563High· 7.8▾ TwilightIn 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 t…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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)
Linux >= eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 < f8a8977af2134a1d91e5f9773cb7d9d53278c830Linux >= eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 < ba95bce5dfe6e2ef602a87e0557225f2934ccb5cLinux >= eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 < c4933624a6f416ecfcc31ab58d585da1207a0597Linux >= eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 < 76dd48886eeeb5fcf2b837d2f4c3d17eebeac9efLinux >= eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 < f0d1fb05d70c8a561cd8d0473bcacafa2fc137ffLinux >= eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 < b1d480fce05f857dc438080cd8c9244b84a83494Linux >= eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 < 8398bc477d3cb3e2b018a5aaac2bec0f69acda30Linux >= eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 < 78f75d632f74b8de0f081a128588f7c37d0d1164Linux 4.19Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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