{"id":"CVE-2026-64004","summary":"net/iucv: fix locking in .getsockopt","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/iucv: fix locking in .getsockopt\n\nMirror iucv_sock_setsockopt() and wrap the whole switch in\nlock_sock()/release_sock(). The pre-existing SO_MSGLIMIT-only lock\nbecomes redundant and is removed.\n\nAny AF_IUCV HIPER user can potentially crash the kernel by racing\nrecvmsg() with getsockopt(SO_MSGSIZE): the SO_MSGSIZE arm dereferences\niucv-\u003ehs_dev-\u003emtu after iucv_sock_close() (called from the racing\nrecvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference\noops.","modified":"2026-07-22T05:30:13.901790838Z","published":"2026-07-19T14:56:20.895Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64004.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88"},{"type":"WEB","url":"https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590dd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64004.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64004"},{"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":"51363b8751a673a00ad48eea895266396d53fa52"},{"fixed":"884eb247b74d86db97e3a37f0d6fc8e1e83590dd"},{"fixed":"45bb8de8c95d8899f4b8f61bd9bceb8132af73cb"},{"fixed":"1fc30bd4e55e2dd622d2d366cecd732c1841bbee"},{"fixed":"cd691beafea0dd779e69e81ccc26b0ab50efcb5e"},{"fixed":"6e792b8dd3002bbc4136745928a9605df1a72b8a"},{"fixed":"9817369243380e287ebe5525411557eaa3aa2a79"},{"fixed":"69554adc7a6fa04ede3ad7512321d83748e3c920"},{"fixed":"3589d20a666caf30ad100c960a2de7de390fce88"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64004.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.4.0"},{"fixed":"5.10.259"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.93"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.35"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64004.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"}]}