{"id":"CVE-2026-64004","revision":null,"records":[{"revision":"76a9bfee8bed458a893327e03f170662","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64004","aliases":[],"title":"net/iucv: fix locking in .getsockopt","description":"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->hs_dev->mtu after iucv_sock_close() (called from the racing\nrecvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference\noops.","state":0,"publishedAt":"2026-07-19T14:56:20.895+00:00","modifiedAt":"2026-10-19T20:18:02.698+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/iucv/af_iucv.c\"\n ],\n \"versions\": [\n {\n \"version\": \"51363b8751a673a00ad48eea895266396d53fa52\",\n \"lessThan\": \"884eb247b74d86db97e3a37f0d6fc8e1e83590dd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"51363b8751a673a00ad48eea895266396d53fa52\",\n \"lessThan\": \"45bb8de8c95d8899f4b8f61bd9bceb8132af73cb\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"51363b8751a673a00ad48eea895266396d53fa52\",\n \"lessThan\": \"1fc30bd4e55e2dd622d2d366cecd732c1841bbee\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"51363b8751a673a00ad48eea895266396d53fa52\",\n \"lessThan\": \"cd691beafea0dd779e69e81ccc26b0ab50efcb5e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"51363b8751a673a00ad48eea895266396d53fa52\",\n \"lessThan\": \"6e792b8dd3002bbc4136745928a9605df1a72b8a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"51363b8751a673a00ad48eea895266396d53fa52\",\n \"lessThan\": \"9817369243380e287ebe5525411557eaa3aa2a79\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"51363b8751a673a00ad48eea895266396d53fa52\",\n \"lessThan\": \"69554adc7a6fa04ede3ad7512321d83748e3c920\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"51363b8751a673a00ad48eea895266396d53fa52\",\n \"lessThan\": \"3589d20a666caf30ad100c960a2de7de390fce88\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\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/iucv/af_iucv.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.4\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.4\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.259\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.210\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.176\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.143\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.93\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.35\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.12\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\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/884eb247b74d86db97e3a37f0d6fc8e1e83590dd","https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb","https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee","https://git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e","https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a","https://git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79","https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920","https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64004","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64004","identifiers":["CVE-2026-64004"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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