CVE-2026-90022

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90022", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.781Z", "datePublished": "2026-09-16T10:33:26.238Z", "dateUpdated": "2026-10-19T08:56:35.790Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:56:35.790Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_midi2: fix use-after-free in string attribute show path\n\nf_midi2_opts_str_show() takes the string lock internally, but its\ncallers dereference the opts->info.<field> pointer before calling it,\noutside the lock. This races with f_midi2_opts_str_store(), which\nfrees the old string under opts->lock when the attribute is written\nconcurrently, the show path can read a pointer that gets freed\nbefore the lock inside str_show() is even taken.\n\nChange f_midi2_opts_str_show() to take a pointer to the string field,\nmatching the existing pattern in f_midi2_opts_str_store(), and\ndereference it only after the lock is held. Update all three callers\n(iface_name, block name, and the EP string option macro) accordingly."}], "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"}, "scenarios": [{"lang": "en", "value": "AV:L - The UAF is reached by concurrent local read/write of midi2 configfs string attributes (iface_name, ep_name, product_id, block name) under /sys/kernel/config/usb_gadget/<g>/functions/midi2.*; no USB host packets, cable, or UDC bind are required, matching other gadget configfs bugs scored Local rather than Physical.\nAC:L - The attacker controls both sides by opening the same attribute on two fds (configfs serializes only per-fd) and racing show against store; store kfree()s the prior kstrndup string under opts->lock while show already holds the stale pointer, and the function need not be bound (store fails only if refcnt != 0).\nPR:L - gadgets_make(), function_make(), and the midi2 show/store handlers perform no capable() check; access is gated only by configfs DAC, and Android/embedded USB gadget HALs routinely chown /sys/kernel/config/usb_gadget to non-root system or daemon accounts.\nUI:N - The attacker creates the midi2 function instance and performs the concurrent attribute read/write themselves; configfs is typically already mounted at /sys/kernel/config, and no victim mount, cable plug, or other-user action is required.\nS:U - The use-after-free of the configfs kstrndup string corrupts kernel heap within the same host kernel security authority; this is not a VM escape, sandbox breakout, or IOMMU/DMA boundary bypass.\nC:H - Callers load opts->info.<field> outside the lock, then f_midi2_opts_str_show() scnprintfs that pointer after a concurrent store kfree()d it; reclaiming the kmalloc object lets the attacker control the bytes copied to userspace, a UAF disclosure primitive.\nI:H - The same UAF of the kstrndup string, with store spraying attacker-chosen size and content into the same slab, is a classic heap use-after-free that can be converted into overlapping objects, arbitrary write, and control-flow hijack.\nA:H - scnprintf() of the freed string after kfree() reliably produces a KASAN slab-use-after-free oops or kernel panic, which the attacker can retrigger with further concurrent show/store loops."}]}], "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_midi2.c"], "versions": [{"version": "29ee7a4dddd5caa18d1cef000f20c6af43f762f1", "lessThan": "f9bdf4c4f6410a1dfafafa383a0e21069372657f", "status": "affected", "versionType": "git"}, {"version": "29ee7a4dddd5caa18d1cef000f20c6af43f762f1", "lessThan": "d11f3300b39e2daad2f0d9d66ddcc39a156cb594", "status": "affected", "versionType": "git"}, {"version": "29ee7a4dddd5caa18d1cef000f20c6af43f762f1", "lessThan": "e89e30f0b5d3004fe5955250bd8b04f3733e32ce", "status": "affected", "versionType": "git"}, {"version": "29ee7a4dddd5caa18d1cef000f20c6af43f762f1", "lessThan": "49fab5e1bdb205c36c965d0e9677bc40d282d3a2", "status": "affected", "versionType": "git"}, {"version": "29ee7a4dddd5caa18d1cef000f20c6af43f762f1", "lessThan": "fed0aa7c6eaedc6c0d4e362fc91724aa47be4a7b", "status": "affected", "versionType": "git"}]}, {"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_midi2.c"], "versions": [{"version": "6.6", "status": "affected"}, {"version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "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": "6.6", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.51"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.2.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f9bdf4c4f6410a1dfafafa383a0e21069372657f"}, {"url": "https://git.kernel.org/stable/c/d11f3300b39e2daad2f0d9d66ddcc39a156cb594"}, {"url": "https://git.kernel.org/stable/c/e89e30f0b5d3004fe5955250bd8b04f3733e32ce"}, {"url": "https://git.kernel.org/stable/c/49fab5e1bdb205c36c965d0e9677bc40d282d3a2"}, {"url": "https://git.kernel.org/stable/c/fed0aa7c6eaedc6c0d4e362fc91724aa47be4a7b"}], "title": "usb: gadget: f_midi2: fix use-after-free in string attribute show path", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/usb/gadget/function/f_midi2.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "f9bdf4c4f6410a1dfafafa383a0e21069372657f", "status": "affected", "version": "29ee7a4dddd5caa18d1cef000f20c6af43f762f1", "versionType": "git"}, {"lessThan": "d11f3300b39e2daad2f0d9d66ddcc39a156cb594", "status": "affected", "version": "29ee7a4dddd5caa18d1cef000f20c6af43f762f1", "versionType": "git"}, {"lessThan": "e89e30f0b5d3004fe5955250bd8b04f3733e32ce", "status": "affected", "version": "29ee7a4dddd5caa18d1cef000f20c6af43f762f1", "versionType": "git"}, {"lessThan": "49fab5e1bdb205c36c965d0e9677bc40d282d3a2", "status": "affected", "version": "29ee7a4dddd5caa18d1cef000f20c6af43f762f1", "versionType": "git"}, {"lessThan": "fed0aa7c6eaedc6c0d4e362fc91724aa47be4a7b", "status": "affected", "version": "29ee7a4dddd5caa18d1cef000f20c6af43f762f1", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/usb/gadget/function/f_midi2.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.6"}, {"lessThan": "6.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "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_midi2: fix use-after-free in string attribute show path\n\nf_midi2_opts_str_show() takes the string lock internally, but its\ncallers dereference the opts->info.<field> pointer before calling it,\noutside the lock. This races with f_midi2_opts_str_store(), which\nfrees the old string under opts->lock when the attribute is written\nconcurrently, the show path can read a pointer that gets freed\nbefore the lock inside str_show() is even taken.\n\nChange f_midi2_opts_str_show() to take a pointer to the string field,\nmatching the existing pattern in f_midi2_opts_str_store(), and\ndereference it only after the lock is held. Update all three callers\n(iface_name, block name, and the EP string option macro) accordingly."}], "id": "CVE-2026-90022", "lastModified": "2026-10-19T09:18:50.257", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-16T11:17:15.140", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/49fab5e1bdb205c36c965d0e9677bc40d282d3a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d11f3300b39e2daad2f0d9d66ddcc39a156cb594"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e89e30f0b5d3004fe5955250bd8b04f3733e32ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f9bdf4c4f6410a1dfafafa383a0e21069372657f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fed0aa7c6eaedc6c0d4e362fc91724aa47be4a7b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,f9bdf4c4f6410a1dfafafa383a0e21069372657f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,d11f3300b39e2daad2f0d9d66ddcc39a156cb594)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e89e30f0b5d3004fe5955250bd8b04f3733e32ce)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,49fab5e1bdb205c36c965d0e9677bc40d282d3a2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,fed0aa7c6eaedc6c0d4e362fc91724aa47be4a7b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.6.157)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.12.110)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.51)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.2.5)"}}], "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": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.157,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.110,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.51,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.5,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc2,*]"}}], "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": "2026-09-17T05:30:07.023154+00:00", "updated": "2026-09-18T07:15:04.746369+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416"]}