{"id":"CVE-2026-53389","summary":"net/tcp-ao: fix use-after-free of key in del_async path","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/tcp-ao: fix use-after-free of key in del_async path\n\nIn tcp_ao_delete_key(), the del_async path skips the current_key\nand rnext_key validity checks present in the synchronous path,\nassuming these pointers are always NULL on LISTEN sockets.  However,\nif a key was added with set_current=1/set_rnext=1 while the socket\nwas in CLOSE state, current_key and rnext_key will be non-NULL\nafter listen() transitions the socket to LISTEN.\n\nWhen such a key is deleted with del_async=1, hlist_del_rcu() and\ncall_rcu() free the key without clearing the dangling pointers.\nAfter the RCU grace period, getsockopt(TCP_AO_INFO) dereferences\ncurrent_key-\u003esndid and rnext_key-\u003ercvid from freed slab memory.\n\nClear current_key and rnext_key in the del_async path when they\nreference the key being deleted.","modified":"2026-07-23T09:59:49.308293086Z","published":"2026-07-19T12:01:54.386Z","related":["openSUSE-SU-2026:11339-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53389.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5ba9950bc9078e19b69cca1e56d1553b125c6857"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6ce7ef41743740ce15c2061561b784148b565b3f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ddc29a094d96e9b3aa280433c6dc443df9eabf2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e77fbefd1269b5c123e7c651a1ebdce1b87d19a0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53389.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53389"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d6732b95b6fbbc6d5bb9d2f809e275763640c4a2"},{"fixed":"6ce7ef41743740ce15c2061561b784148b565b3f"},{"fixed":"e77fbefd1269b5c123e7c651a1ebdce1b87d19a0"},{"fixed":"7ddc29a094d96e9b3aa280433c6dc443df9eabf2"},{"fixed":"5ba9950bc9078e19b69cca1e56d1553b125c6857"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53389.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.95"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.38"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53389.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}