{"id":"CVE-2026-68335","revision":"df7429153cfb4fed84466533bdbf1249","records":[{"revision":"df7429153cfb4fed84466533bdbf1249","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-68335","aliases":[],"title":"rds: drop incoming messages that cross network namespace boundaries","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrds: drop incoming messages that cross network namespace boundaries\n\nrds_find_bound() looks up the destination socket using a global\nrhashtable keyed solely on (addr, port, scope_id).  Network namespaces\nare not part of the key, so a sender in netns A can deliver an incoming\nmessage (inc) to a socket that lives in a different netns B.\n\nWhen this happens, inc->i_conn points to an rds_connection whose c_net\nis netns A, but the receiving rs lives in netns B.  Once the child\nprocess that created netns A exits, cleanup_net() calls\nrds_loop_exit_net() -> rds_loop_kill_conns() -> rds_conn_destroy(),\nfreeing that connection.  If the survivor socket in netns B still holds\nthe inc, any subsequent dereference of inc->i_conn is a use-after-free.\n\nThere are two dangerous sites in rds_clear_recv_queue():\n  1. inc->i_conn->c_lcong (offset 88 of freed rds_connection, size 200)\n     read via rds_recv_rcvbuf_delta() -- confirmed by KASAN.\n  2. inc->i_conn->c_trans->inc_free(inc) (function pointer at offset 80)\n     called via rds_inc_put() when the inc refcount reaches zero -- same\n     race window, potential call-through-freed-object primitive.\n\nThe bug is reachable from unprivileged user namespaces\n(CLONE_NEWUSER + CLONE_NEWNET), available since Linux 3.8.\n\nFix this by rejecting the delivery in rds_recv_incoming() when the\nsocket returned by rds_find_bound() belongs to a different network\nnamespace than the connection that carried the message.  Use the\nexisting rds_conn_net() / sock_net() helpers and net_eq() for the\ncomparison.","state":0,"publishedAt":"2026-08-10T12:03:11.547+00:00","modifiedAt":"2026-10-19T21:09:05.269+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/recv.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\",\n                            \"lessThan\": \"742ff6f02545212e991cd8b45011e40d2c2ef25a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\",\n                            \"lessThan\": \"abff41fd928328bbf3dda1140beb2e61fa424ccd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\",\n                            \"lessThan\": \"03c574112e5d066df0ddce36d7438e850bcf3050\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\",\n                            \"lessThan\": \"1e2e2d9806944fe485824d617c8b7c78116c22db\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\",\n                            \"lessThan\": \"cfb3ce07b705e486e022a2f2b1242b48f13981ff\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\",\n                            \"lessThan\": \"9591042533140dfe6608d9344806d567dcd39d02\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\",\n                            \"lessThan\": \"0f8690e3869109cd5803ccb400889d20a0b54e0e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\",\n                            \"lessThan\": \"5521ae71e32a8069ed4ca6e792179dc57bc43ab2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c827073c95fde388bc65fe5227f944eaf859b9f0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4.17.19\",\n                            \"lessThan\": \"4.18\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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/recv.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.18\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.18\",\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\": \"6.6.148\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.101\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.42\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.6\",\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/742ff6f02545212e991cd8b45011e40d2c2ef25a","https://git.kernel.org/stable/c/abff41fd928328bbf3dda1140beb2e61fa424ccd","https://git.kernel.org/stable/c/03c574112e5d066df0ddce36d7438e850bcf3050","https://git.kernel.org/stable/c/1e2e2d9806944fe485824d617c8b7c78116c22db","https://git.kernel.org/stable/c/cfb3ce07b705e486e022a2f2b1242b48f13981ff","https://git.kernel.org/stable/c/9591042533140dfe6608d9344806d567dcd39d02","https://git.kernel.org/stable/c/0f8690e3869109cd5803ccb400889d20a0b54e0e","https://git.kernel.org/stable/c/5521ae71e32a8069ed4ca6e792179dc57bc43ab2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68335","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-68335","identifiers":["CVE-2026-68335"]},"retained":false,"historicalAffected":[]}],"coverage":[]}