{"id":"CVE-2026-74563","revision":"67a07d48904c4a8388093a29a14f232a","records":[{"revision":"67a07d48904c4a8388093a29a14f232a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74563","aliases":[],"title":"rds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check()\n\nrds_tcp_laddr_check() looks up a scoped IPv6 interface with\ndev_get_by_index_rcu(), drops the RCU read-side lock, and only then\npasses the bare struct net_device * into ipv6_chk_addr().\n\ndev_get_by_index_rcu() only keeps the device alive within the same RCU\nread-side section. After rcu_read_unlock(), a concurrent RTM_DELLINK can\nfree the net_device; ipv6_chk_addr() then dereferences the stale pointer\nin __ipv6_chk_addr_and_flags() (e.g. l3mdev_master_dev_rcu(dev)), reading\nfreed memory.\n\nKeep the RCU read-side lock held across the ipv6_chk_addr() call instead\nof dropping it right after the lookup, so the device cannot be freed\nwhile it is in use.\n\n  BUG: KASAN: slab-use-after-free in __ipv6_chk_addr_and_flags (... net/ipv6/addrconf.c:1998)\n  Read of size 8 at addr ffff8880106ec000 by task exploit/153\n  Call Trace:\n   ...\n   kasan_report (mm/kasan/report.c:595)\n   __ipv6_chk_addr_and_flags (... net/ipv6/addrconf.c:1998)\n   ipv6_chk_addr (net/ipv6/addrconf.c:2031 net/ipv6/addrconf.c:1972)\n   rds_tcp_laddr_check (net/rds/tcp.c:370)\n   rds_bind (net/rds/bind.c:248)\n   __sys_bind (net/socket.c:1920)\n   __x64_sys_bind (net/socket.c:1956)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:63)\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)","state":0,"publishedAt":"2026-08-15T12:28:05.768+00:00","modifiedAt":"2026-10-16T19:05:55.886+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/rds/tcp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"eee2fa6ab3225192d6d894c54a6fb02ac9efdff6\",\n                            \"lessThan\": \"f8a8977af2134a1d91e5f9773cb7d9d53278c830\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eee2fa6ab3225192d6d894c54a6fb02ac9efdff6\",\n                            \"lessThan\": \"ba95bce5dfe6e2ef602a87e0557225f2934ccb5c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eee2fa6ab3225192d6d894c54a6fb02ac9efdff6\",\n                            \"lessThan\": \"c4933624a6f416ecfcc31ab58d585da1207a0597\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eee2fa6ab3225192d6d894c54a6fb02ac9efdff6\",\n                            \"lessThan\": \"76dd48886eeeb5fcf2b837d2f4c3d17eebeac9ef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eee2fa6ab3225192d6d894c54a6fb02ac9efdff6\",\n                            \"lessThan\": \"f0d1fb05d70c8a561cd8d0473bcacafa2fc137ff\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eee2fa6ab3225192d6d894c54a6fb02ac9efdff6\",\n                            \"lessThan\": \"b1d480fce05f857dc438080cd8c9244b84a83494\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eee2fa6ab3225192d6d894c54a6fb02ac9efdff6\",\n                            \"lessThan\": \"8398bc477d3cb3e2b018a5aaac2bec0f69acda30\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eee2fa6ab3225192d6d894c54a6fb02ac9efdff6\",\n                            \"lessThan\": \"78f75d632f74b8de0f081a128588f7c37d0d1164\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/rds/tcp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.265\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.216\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.183\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.151\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.103\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.44\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.8\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74563","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74563","identifiers":["CVE-2026-74563"]},"retained":false,"historicalAffected":[]}],"coverage":[]}