{"id":"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() -\u003e\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-\u003esk_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.","modified":"2026-08-21T03:30:44.309174926Z","published":"2026-08-10T12:04:16.772Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68397.json"},"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/5739be5c19495d709d902a2912c9102ce78740d5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bc6c6e546ffff8865daaeb622ef348c2d481e80f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c75a950e77356e526672cba4584080c6c8b793b6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e3e0679fc950191aff8f27fa78abcfc2462cff4a"},{"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3881ac441f642d56503818123446f7298442236b"},{"fixed":"5739be5c19495d709d902a2912c9102ce78740d5"},{"fixed":"bc6c6e546ffff8865daaeb622ef348c2d481e80f"},{"fixed":"e3e0679fc950191aff8f27fa78abcfc2462cff4a"},{"fixed":"4dc0e63abf8bc7ba8892e617c1fb8b204361e022"},{"fixed":"1801cb20a5025a787d6853e19c38db138344b4b4"},{"fixed":"c75a950e77356e526672cba4584080c6c8b793b6"},{"fixed":"5595ea59cdf29182cf6a270cacc1426c57b603de"},{"fixed":"4fa349156043dc119721d067329714179f501749"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68397.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.0"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68397.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}