rds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74563
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:18:01 UTC
Updated2026-08-15 13:18:01 UTC
DescriptionIn 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)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 76dd48886eeeb5fcf2b837d2f4c3d17eebeac9ef git Not specified
CNA Linux Linux affected eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 f0d1fb05d70c8a561cd8d0473bcacafa2fc137ff git Not specified
CNA Linux Linux affected eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 b1d480fce05f857dc438080cd8c9244b84a83494 git Not specified
CNA Linux Linux affected eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 8398bc477d3cb3e2b018a5aaac2bec0f69acda30 git Not specified
CNA Linux Linux affected eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 78f75d632f74b8de0f081a128588f7c37d0d1164 git Not specified
CNA Linux Linux affected 4.19 Not specified
CNA Linux Linux unaffected 4.19 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/78f75d632f74b8de0f081a128588f7c37d0d1164 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/76dd48886eeeb5fcf2b837d2f4c3d17eebeac9ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b1d480fce05f857dc438080cd8c9244b84a83494 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8398bc477d3cb3e2b018a5aaac2bec0f69acda30 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f0d1fb05d70c8a561cd8d0473bcacafa2fc137ff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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