{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64004", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.026Z", "datePublished": "2026-07-19T14:56:20.895Z", "dateUpdated": "2026-07-20T13:42:15.900Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-20T13:42:15.900Z"}, "descriptions": [{"lang": "en", "value": "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."}], "metrics": [{"cvssV3_1": {"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"}}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/iucv/af_iucv.c"], "versions": [{"version": "51363b8751a673a00ad48eea895266396d53fa52", "lessThan": "884eb247b74d86db97e3a37f0d6fc8e1e83590dd", "status": "affected", "versionType": "git"}, {"version": "51363b8751a673a00ad48eea895266396d53fa52", "lessThan": "45bb8de8c95d8899f4b8f61bd9bceb8132af73cb", 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"versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "5.10.259"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "5.15.210"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "6.12.93"}, {"vulnerable": true, "criteria": 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"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"}}}}

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{"bugzilla": {"description": "kernel: net/iucv: fix locking in .getsockopt", "id": "2502441", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502441"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/iucv: fix locking in .getsockopt\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.\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.", "A flaw was found in the Linux kernel's AF_IUCV (Inter-User Communication Vehicle) networking module. A local user can exploit a race condition between message reception and socket option retrieval, specifically when calling getsockopt(SO_MSGSIZE). This can lead to a null pointer dereference, causing the kernel to crash and resulting in a Denial of Service (DoS)."], "name": "CVE-2026-64004", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64004\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64004\nhttps://lore.kernel.org/linux-cve-announce/2026071907-CVE-2026-64004-7455@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[51363b8751a673a00ad48eea895266396d53fa52,884eb247b74d86db97e3a37f0d6fc8e1e83590dd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[51363b8751a673a00ad48eea895266396d53fa52,45bb8de8c95d8899f4b8f61bd9bceb8132af73cb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[51363b8751a673a00ad48eea895266396d53fa52,1fc30bd4e55e2dd622d2d366cecd732c1841bbee)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[51363b8751a673a00ad48eea895266396d53fa52,cd691beafea0dd779e69e81ccc26b0ab50efcb5e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[51363b8751a673a00ad48eea895266396d53fa52,6e792b8dd3002bbc4136745928a9605df1a72b8a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[51363b8751a673a00ad48eea895266396d53fa52,9817369243380e287ebe5525411557eaa3aa2a79)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[51363b8751a673a00ad48eea895266396d53fa52,69554adc7a6fa04ede3ad7512321d83748e3c920)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[51363b8751a673a00ad48eea895266396d53fa52,3589d20a666caf30ad100c960a2de7de390fce88)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.4"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.4)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.259,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.210,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.176,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.143,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.93,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.35,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.12,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-21T07:00:02.936340+00:00", "updated": "2026-07-21T07:00:02.936411+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}