CVE-2026-90022 (GCVE-0-2026-90022)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:33 – Updated: 2026-10-19 08:56
VLAI
Title
usb: gadget: f_midi2: fix use-after-free in string attribute show path
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_midi2: fix use-after-free in string attribute show path f_midi2_opts_str_show() takes the string lock internally, but its callers dereference the opts->info.<field> pointer before calling it, outside the lock. This races with f_midi2_opts_str_store(), which frees the old string under opts->lock when the attribute is written concurrently, the show path can read a pointer that gets freed before the lock inside str_show() is even taken. Change f_midi2_opts_str_show() to take a pointer to the string field, matching the existing pattern in f_midi2_opts_str_store(), and dereference it only after the lock is held. Update all three callers (iface_name, block name, and the EP string option macro) accordingly.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 29ee7a4dddd5caa18d1cef000f20c6af43f762f1 , < f9bdf4c4f6410a1dfafafa383a0e21069372657f (git)
Affected: 29ee7a4dddd5caa18d1cef000f20c6af43f762f1 , < d11f3300b39e2daad2f0d9d66ddcc39a156cb594 (git)
Affected: 29ee7a4dddd5caa18d1cef000f20c6af43f762f1 , < e89e30f0b5d3004fe5955250bd8b04f3733e32ce (git)
Affected: 29ee7a4dddd5caa18d1cef000f20c6af43f762f1 , < 49fab5e1bdb205c36c965d0e9677bc40d282d3a2 (git)
Affected: 29ee7a4dddd5caa18d1cef000f20c6af43f762f1 , < fed0aa7c6eaedc6c0d4e362fc91724aa47be4a7b (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "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-\u003einfo.\u003cfield\u003e pointer before calling it,\noutside the lock. This races with f_midi2_opts_str_store(), which\nfrees the old string under opts-\u003elock 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."
        }
      ],
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            "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"
          },
          "scenarios": [
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              "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/\u003cg\u003e/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-\u003elock 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-\u003einfo.\u003cfield\u003e 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:56:35.790Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "usb: gadget: f_midi2: fix use-after-free in string attribute show path",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90022",
    "datePublished": "2026-09-16T10:33:26.238Z",
    "dateReserved": "2026-09-11T19:38:34.781Z",
    "dateUpdated": "2026-10-19T08:56:35.790Z",
    "state": "PUBLISHED"
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      "initial_release_date": "2026-09-17T01:14:44.000Z",
      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "usb: gadget: f_midi2: fix use-after-free in string attribute show path",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90022.json",
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            "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-\u003einfo.\u003cfield\u003e pointer before calling it,\noutside the lock. This races with f_midi2_opts_str_store(), which\nfrees the old string under opts-\u003elock 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": {
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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      "current_release_date": "2026-11-07T10:32:54+00:00",
      "cve": "CVE-2026-90022",
      "id": "CVE-2026-90022",
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      "product_status:known_not_affected": "203",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: gadget: f_midi2: fix use-after-free in string attribute show path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90022.json",
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  }
}



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