{"id":"CVE-2026-68397","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-68397","summary":"net/iucv: take a reference on the socket found in afiucv_hs_rcv()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/iucv: take a reference on the socket found in afiucv_hs_rcv()\n\nafiucv_hs_rcv() looks up the destination socket under iucv_sk_list.lock,\ndrops the lock, and then passes the socket to the afiucv_hs_callback_*()\nhandlers without holding a reference. AF_IUCV sockets are not\nRCU-protected and are freed synchronously by iucv_sock_kill() ->\nsock_put(), so a concurrent close can free the socket in the window\nbetween read_unlock() and the handler, which then dereferences freed\nmemory (for example sk->sk_data_ready() in afiucv_hs_callback_syn()).\n\nTake a reference with sock_hold() while the socket is still on the list\nand release it with sock_put() once the handler has run.","published":"2026-08-10T12:04:16.772Z","modified":"2026-08-14T04:04:01.505738540Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.6.148"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1801cb20a5025a787d6853e19c38db138344b4b4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4dc0e63abf8bc7ba8892e617c1fb8b204361e022"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4fa349156043dc119721d067329714179f501749"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5595ea59cdf29182cf6a270cacc1426c57b603de"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c75a950e77356e526672cba4584080c6c8b793b6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68397.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68397"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-14T04:04:01.505738540Z"}}