{"api_version":"1","generated_at":"2026-07-23T12:00:40+00:00","cve":"CVE-2026-64004","urls":{"html":"https://cve.report/CVE-2026-64004","api":"https://cve.report/api/cve/CVE-2026-64004.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64004","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64004"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:40","updated_at":"2026-07-20 15:17:01"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88","name":"https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590dd","name":"https://git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590dd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e","name":"https://git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a","name":"https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920","name":"https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79","name":"https://git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee","name":"https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb","name":"https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64004","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64004","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 51363b8751a673a00ad48eea895266396d53fa52 884eb247b74d86db97e3a37f0d6fc8e1e83590dd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 51363b8751a673a00ad48eea895266396d53fa52 45bb8de8c95d8899f4b8f61bd9bceb8132af73cb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 51363b8751a673a00ad48eea895266396d53fa52 1fc30bd4e55e2dd622d2d366cecd732c1841bbee git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 51363b8751a673a00ad48eea895266396d53fa52 cd691beafea0dd779e69e81ccc26b0ab50efcb5e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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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."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:42:15.900Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590dd"},{"url":"https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb"},{"url":"https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee"},{"url":"https://git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e"},{"url":"https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a"},{"url":"https://git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79"},{"url":"https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920"},{"url":"https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88"}],"title":"net/iucv: fix locking in .getsockopt","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64004","datePublished":"2026-07-19T14:56:20.895Z","dateReserved":"2026-07-19T07:54:57.026Z","dateUpdated":"2026-07-20T13:42:15.900Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:40","lastModifiedDate":"2026-07-20 15:17:01","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64004","Ordinal":"1","Title":"net/iucv: fix locking in .getsockopt","CVE":"CVE-2026-64004","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64004","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"net/iucv: fix locking in .getsockopt"}]}}}