{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90021", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.781Z", "datePublished": "2026-09-16T10:33:25.560Z", "dateUpdated": "2026-10-21T12:49:27.661Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:49:27.661Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_midi: initialize work in f_midi_alloc()\n\nf_midi_alloc initializes free_ref to 1 and it can only be incremented\nwhen a sound card is registered via f_midi_register_card().\nf_midi_register_card() is only called in f_midi_bind() which actually\nperforms INIT_WORK. If f_midi_bind() is never run, work is not\ninitialized and the if condition in f_midi_free becomes true,\nthis results in a warning later in __flush_work as work->func = 0.\nFix this by moving INIT_WORK from f_midi_bind() to f_midi_alloc()."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/gadget/function/f_midi.c"], "versions": [{"version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "lessThan": "13e9f5a91360952b9b5bbc2367fc29d4a4ff2824", "status": "affected", "versionType": "git"}, {"version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "lessThan": "3d8b11255e632170f32f1925bfcaf96331f36317", "status": "affected", "versionType": "git"}, {"version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "lessThan": "02ac76f27db23ef652358458c272d9d2d6f51167", "status": "affected", "versionType": "git"}, {"version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "lessThan": "858576de6b2f5166b08dae803f0fd0766dcb3002", "status": "affected", "versionType": "git"}, {"version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "lessThan": "7e07d3e4c389217d7d7171d80edf2e23ac70f1ea", "status": "affected", "versionType": "git"}, {"version": "89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d", "status": "affected", "versionType": "git"}, {"version": "3635523e9b96213969693c320302d536774d8e9b", "status": "affected", "versionType": "git"}, {"version": "5.4.291", "lessThan": "5.5", "status": "affected", "versionType": "semver"}, {"version": "5.10.235", "lessThan": "5.11", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/gadget/function/f_midi.c"], "versions": [{"version": "5.12", "status": "affected"}, {"version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.5", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "5.12", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.18.51"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "7.2.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.291"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.235"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/13e9f5a91360952b9b5bbc2367fc29d4a4ff2824"}, {"url": "https://git.kernel.org/stable/c/3d8b11255e632170f32f1925bfcaf96331f36317"}, {"url": "https://git.kernel.org/stable/c/02ac76f27db23ef652358458c272d9d2d6f51167"}, {"url": "https://git.kernel.org/stable/c/858576de6b2f5166b08dae803f0fd0766dcb3002"}, {"url": "https://git.kernel.org/stable/c/7e07d3e4c389217d7d7171d80edf2e23ac70f1ea"}], "title": "usb: gadget: f_midi: initialize work in f_midi_alloc()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/usb/gadget/function/f_midi.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "13e9f5a91360952b9b5bbc2367fc29d4a4ff2824", "status": "affected", "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "versionType": "git"}, {"lessThan": "3d8b11255e632170f32f1925bfcaf96331f36317", "status": "affected", "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "versionType": "git"}, {"lessThan": "02ac76f27db23ef652358458c272d9d2d6f51167", "status": "affected", "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "versionType": "git"}, {"lessThan": "858576de6b2f5166b08dae803f0fd0766dcb3002", "status": "affected", "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "versionType": "git"}, {"lessThan": "7e07d3e4c389217d7d7171d80edf2e23ac70f1ea", "status": "affected", "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "versionType": "git"}, {"status": "affected", "version": "89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d", "versionType": "git"}, {"status": "affected", "version": "3635523e9b96213969693c320302d536774d8e9b", "versionType": "git"}, {"lessThan": "5.5", "status": "affected", "version": "5.4.291", "versionType": "semver"}, {"lessThan": "5.11", "status": "affected", "version": "5.10.235", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/usb/gadget/function/f_midi.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.12"}, {"lessThan": "5.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.51", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_midi: initialize work in f_midi_alloc()\n\nf_midi_alloc initializes free_ref to 1 and it can only be incremented\nwhen a sound card is registered via f_midi_register_card().\nf_midi_register_card() is only called in f_midi_bind() which actually\nperforms INIT_WORK. If f_midi_bind() is never run, work is not\ninitialized and the if condition in f_midi_free becomes true,\nthis results in a warning later in __flush_work as work->func = 0.\nFix this by moving INIT_WORK from f_midi_bind() to f_midi_alloc()."}], "id": "CVE-2026-90021", "lastModified": "2026-10-21T13:20:34.153", "metrics": {}, "published": "2026-09-16T11:17:15.030", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/02ac76f27db23ef652358458c272d9d2d6f51167"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/13e9f5a91360952b9b5bbc2367fc29d4a4ff2824"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3d8b11255e632170f32f1925bfcaf96331f36317"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7e07d3e4c389217d7d7171d80edf2e23ac70f1ea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/858576de6b2f5166b08dae803f0fd0766dcb3002"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: usb: gadget: f_midi: initialize work in f_midi_alloc()", "id": "2535407", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535407"}, "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-824", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nusb: gadget: f_midi: initialize work in f_midi_alloc()\nf_midi_alloc initializes free_ref to 1 and it can only be incremented\nwhen a sound card is registered via f_midi_register_card().\nf_midi_register_card() is only called in f_midi_bind() which actually\nperforms INIT_WORK. If f_midi_bind() is never run, work is not\ninitialized and the if condition in f_midi_free becomes true,\nthis results in a warning later in __flush_work as work->func = 0.\nFix this by moving INIT_WORK from f_midi_bind() to f_midi_alloc().", "A flaw was found in the Linux kernel's USB MIDI gadget driver (f_midi). When a sound card is not registered, a work queue item may not be properly initialized. This can lead to a warning and a potential system crash, resulting in a Denial of Service (DoS) for a local attacker."], "name": "CVE-2026-90021", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-90021\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-90021\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90021.mbox"], "threat_severity": "Moderate"}