Vulnerability-Lookup

CVE-2026-90024 (GCVE-0-2026-90024)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:33 – Updated: 2026-09-16 10:33

Title

usb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs A null-pointer dereference occurs in f_midi2_free_ep_reqs() when attempting to clean up an endpoint that was never initialized. When configuring the MIDI 2.0 gadget via configfs and setting the block direction to SNDRV_UMP_DIR_INPUT, the initialization of the midi1_ep_out endpoint is explicitly skipped during the gadget bind phase (f_midi2_bind()). As a result, the usb_ep->card field remains NULL. Later, when the host sets the alternate setting, f_midi2_set_alt() unconditionally stops both the IN and OUT endpoints by calling f_midi2_stop_eps(), which in turn calls f_midi2_free_ep_reqs() for both endpoints. When f_midi2_free_ep_reqs() is called for the uninitialized midi1_ep_out, it attempts to dereference usb_ep->card to determine the number of requests to free, leading to a crash. Fix this by using usb_ep->num_reqs instead of usb_ep->card->info.num_reqs in f_midi2_free_ep_reqs(). usb_ep->num_reqs is correctly set during f_midi2_init_ep() and remains 0 if the endpoint was never initialized, safely avoiding the loop. For consistency, apply the same change to f_midi2_alloc_ep_reqs(). Oops: general protection fault, probably for non-canonical address 0xdffffc00000000ee: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000770-0x0000000000000777] ... RIP: 0010:f_midi2_free_ep_reqs drivers/usb/gadget/function/f_midi2.c:1166 [inline] RIP: 0010:f_midi2_stop_eps+0x28e/0x4d0 drivers/usb/gadget/function/f_midi2.c:1246 ... Call Trace: <TASK> f_midi2_set_alt+0x11c/0xf00 drivers/usb/gadget/function/f_midi2.c:1296 composite_setup+0x1ffd/0x3480 drivers/usb/gadget/composite.c:1933 configfs_composite_setup+0xbd/0x100 drivers/usb/gadget/configfs.c:1877

Severity

No CVSS data available.

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/51ddc55c75087ac25…
https://git.kernel.org/stable/c/5b92f6a0c7c01efbb…
https://git.kernel.org/stable/c/9c3d5091e3568ed48…
https://git.kernel.org/stable/c/4079f19a0e1ce76f1…
https://git.kernel.org/stable/c/f0efaf1872949e96d…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 8b645922b22303cec4628dbbbf6c8553d1cdec87 , < 51ddc55c75087ac25342f6d73d3aeaf14f59bd76 (git) Affected: 8b645922b22303cec4628dbbbf6c8553d1cdec87 , < 5b92f6a0c7c01efbb335d837ecdf34d38d98720f (git) Affected: 8b645922b22303cec4628dbbbf6c8553d1cdec87 , < 9c3d5091e3568ed48ac4c5b08a78eb06fad0d70a (git) Affected: 8b645922b22303cec4628dbbbf6c8553d1cdec87 , < 4079f19a0e1ce76f1e21a398f02aca150ceaaf61 (git) Affected: 8b645922b22303cec4628dbbbf6c8553d1cdec87 , < f0efaf1872949e96d213c8e910fd9517f7d7c406 (git)	guessed
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-rc2 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "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": "51ddc55c75087ac25342f6d73d3aeaf14f59bd76",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "versionType": "git"
            },
            {
              "lessThan": "5b92f6a0c7c01efbb335d837ecdf34d38d98720f",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "versionType": "git"
            },
            {
              "lessThan": "9c3d5091e3568ed48ac4c5b08a78eb06fad0d70a",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "versionType": "git"
            },
            {
              "lessThan": "4079f19a0e1ce76f1e21a398f02aca150ceaaf61",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "versionType": "git"
            },
            {
              "lessThan": "f0efaf1872949e96d213c8e910fd9517f7d7c406",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "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-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc2",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs\n\nA null-pointer dereference occurs in f_midi2_free_ep_reqs() when attempting\nto clean up an endpoint that was never initialized.\n\nWhen configuring the MIDI 2.0 gadget via configfs and setting the block\ndirection to SNDRV_UMP_DIR_INPUT, the initialization of the midi1_ep_out\nendpoint is explicitly skipped during the gadget bind phase\n(f_midi2_bind()). As a result, the usb_ep-\u003ecard field remains NULL.\n\nLater, when the host sets the alternate setting, f_midi2_set_alt()\nunconditionally stops both the IN and OUT endpoints by calling\nf_midi2_stop_eps(), which in turn calls f_midi2_free_ep_reqs() for both\nendpoints. When f_midi2_free_ep_reqs() is called for the uninitialized\nmidi1_ep_out, it attempts to dereference usb_ep-\u003ecard to determine the\nnumber of requests to free, leading to a crash.\n\nFix this by using usb_ep-\u003enum_reqs instead of usb_ep-\u003ecard-\u003einfo.num_reqs\nin f_midi2_free_ep_reqs(). usb_ep-\u003enum_reqs is correctly set during\nf_midi2_init_ep() and remains 0 if the endpoint was never initialized,\nsafely avoiding the loop. For consistency, apply the same change to\nf_midi2_alloc_ep_reqs().\n\nOops: general protection fault, probably for non-canonical address\n0xdffffc00000000ee: 0000 [#1] SMP KASAN NOPTI\nKASAN: null-ptr-deref in range [0x0000000000000770-0x0000000000000777]\n...\nRIP: 0010:f_midi2_free_ep_reqs drivers/usb/gadget/function/f_midi2.c:1166\n[inline]\nRIP: 0010:f_midi2_stop_eps+0x28e/0x4d0\ndrivers/usb/gadget/function/f_midi2.c:1246\n...\nCall Trace:\n \u003cTASK\u003e\n f_midi2_set_alt+0x11c/0xf00 drivers/usb/gadget/function/f_midi2.c:1296\n composite_setup+0x1ffd/0x3480 drivers/usb/gadget/composite.c:1933\n configfs_composite_setup+0xbd/0x100 drivers/usb/gadget/configfs.c:1877"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T10:33:27.624Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/51ddc55c75087ac25342f6d73d3aeaf14f59bd76"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b92f6a0c7c01efbb335d837ecdf34d38d98720f"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c3d5091e3568ed48ac4c5b08a78eb06fad0d70a"
        },
        {
          "url": "https://git.kernel.org/stable/c/4079f19a0e1ce76f1e21a398f02aca150ceaaf61"
        },
        {
          "url": "https://git.kernel.org/stable/c/f0efaf1872949e96d213c8e910fd9517f7d7c406"
        }
      ],
      "title": "usb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90024",
    "datePublished": "2026-09-16T10:33:27.624Z",
    "dateReserved": "2026-09-11T19:38:34.782Z",
    "dateUpdated": "2026-09-16T10:33:27.624Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-90024\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-16T11:17:15.357\",\"lastModified\":\"2026-09-16T11:17:15.357\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs\\n\\nA null-pointer dereference occurs in f_midi2_free_ep_reqs() when attempting\\nto clean up an endpoint that was never initialized.\\n\\nWhen configuring the MIDI 2.0 gadget via configfs and setting the block\\ndirection to SNDRV_UMP_DIR_INPUT, the initialization of the midi1_ep_out\\nendpoint is explicitly skipped during the gadget bind phase\\n(f_midi2_bind()). As a result, the usb_ep-\u003ecard field remains NULL.\\n\\nLater, when the host sets the alternate setting, f_midi2_set_alt()\\nunconditionally stops both the IN and OUT endpoints by calling\\nf_midi2_stop_eps(), which in turn calls f_midi2_free_ep_reqs() for both\\nendpoints. When f_midi2_free_ep_reqs() is called for the uninitialized\\nmidi1_ep_out, it attempts to dereference usb_ep-\u003ecard to determine the\\nnumber of requests to free, leading to a crash.\\n\\nFix this by using usb_ep-\u003enum_reqs instead of usb_ep-\u003ecard-\u003einfo.num_reqs\\nin f_midi2_free_ep_reqs(). usb_ep-\u003enum_reqs is correctly set during\\nf_midi2_init_ep() and remains 0 if the endpoint was never initialized,\\nsafely avoiding the loop. For consistency, apply the same change to\\nf_midi2_alloc_ep_reqs().\\n\\nOops: general protection fault, probably for non-canonical address\\n0xdffffc00000000ee: 0000 [#1] SMP KASAN NOPTI\\nKASAN: null-ptr-deref in range [0x0000000000000770-0x0000000000000777]\\n...\\nRIP: 0010:f_midi2_free_ep_reqs drivers/usb/gadget/function/f_midi2.c:1166\\n[inline]\\nRIP: 0010:f_midi2_stop_eps+0x28e/0x4d0\\ndrivers/usb/gadget/function/f_midi2.c:1246\\n...\\nCall Trace:\\n \u003cTASK\u003e\\n f_midi2_set_alt+0x11c/0xf00 drivers/usb/gadget/function/f_midi2.c:1296\\n composite_setup+0x1ffd/0x3480 drivers/usb/gadget/composite.c:1933\\n configfs_composite_setup+0xbd/0x100 drivers/usb/gadget/configfs.c:1877\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/gadget/function/f_midi2.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8b645922b22303cec4628dbbbf6c8553d1cdec87\",\"lessThan\":\"51ddc55c75087ac25342f6d73d3aeaf14f59bd76\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8b645922b22303cec4628dbbbf6c8553d1cdec87\",\"lessThan\":\"5b92f6a0c7c01efbb335d837ecdf34d38d98720f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8b645922b22303cec4628dbbbf6c8553d1cdec87\",\"lessThan\":\"9c3d5091e3568ed48ac4c5b08a78eb06fad0d70a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8b645922b22303cec4628dbbbf6c8553d1cdec87\",\"lessThan\":\"4079f19a0e1ce76f1e21a398f02aca150ceaaf61\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8b645922b22303cec4628dbbbf6c8553d1cdec87\",\"lessThan\":\"f0efaf1872949e96d213c8e910fd9517f7d7c406\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/gadget/function/f_midi2.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.110\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.51\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.5\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4079f19a0e1ce76f1e21a398f02aca150ceaaf61\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/51ddc55c75087ac25342f6d73d3aeaf14f59bd76\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5b92f6a0c7c01efbb335d837ecdf34d38d98720f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9c3d5091e3568ed48ac4c5b08a78eb06fad0d70a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f0efaf1872949e96d213c8e910fd9517f7d7c406\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-90024

Vulnerability from fkie_nvd - Published: 2026-09-16 11:17 - Updated: 2026-09-16 11:17

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4079f19a0e1ce76f1e21a398f02aca150ceaaf61
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/51ddc55c75087ac25342f6d73d3aeaf14f59bd76
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5b92f6a0c7c01efbb335d837ecdf34d38d98720f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9c3d5091e3568ed48ac4c5b08a78eb06fad0d70a
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f0efaf1872949e96d213c8e910fd9517f7d7c406

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "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": "51ddc55c75087ac25342f6d73d3aeaf14f59bd76",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "versionType": "git"
            },
            {
              "lessThan": "5b92f6a0c7c01efbb335d837ecdf34d38d98720f",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "versionType": "git"
            },
            {
              "lessThan": "9c3d5091e3568ed48ac4c5b08a78eb06fad0d70a",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "versionType": "git"
            },
            {
              "lessThan": "4079f19a0e1ce76f1e21a398f02aca150ceaaf61",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "versionType": "git"
            },
            {
              "lessThan": "f0efaf1872949e96d213c8e910fd9517f7d7c406",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "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-rc2",
              "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: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs\n\nA null-pointer dereference occurs in f_midi2_free_ep_reqs() when attempting\nto clean up an endpoint that was never initialized.\n\nWhen configuring the MIDI 2.0 gadget via configfs and setting the block\ndirection to SNDRV_UMP_DIR_INPUT, the initialization of the midi1_ep_out\nendpoint is explicitly skipped during the gadget bind phase\n(f_midi2_bind()). As a result, the usb_ep-\u003ecard field remains NULL.\n\nLater, when the host sets the alternate setting, f_midi2_set_alt()\nunconditionally stops both the IN and OUT endpoints by calling\nf_midi2_stop_eps(), which in turn calls f_midi2_free_ep_reqs() for both\nendpoints. When f_midi2_free_ep_reqs() is called for the uninitialized\nmidi1_ep_out, it attempts to dereference usb_ep-\u003ecard to determine the\nnumber of requests to free, leading to a crash.\n\nFix this by using usb_ep-\u003enum_reqs instead of usb_ep-\u003ecard-\u003einfo.num_reqs\nin f_midi2_free_ep_reqs(). usb_ep-\u003enum_reqs is correctly set during\nf_midi2_init_ep() and remains 0 if the endpoint was never initialized,\nsafely avoiding the loop. For consistency, apply the same change to\nf_midi2_alloc_ep_reqs().\n\nOops: general protection fault, probably for non-canonical address\n0xdffffc00000000ee: 0000 [#1] SMP KASAN NOPTI\nKASAN: null-ptr-deref in range [0x0000000000000770-0x0000000000000777]\n...\nRIP: 0010:f_midi2_free_ep_reqs drivers/usb/gadget/function/f_midi2.c:1166\n[inline]\nRIP: 0010:f_midi2_stop_eps+0x28e/0x4d0\ndrivers/usb/gadget/function/f_midi2.c:1246\n...\nCall Trace:\n \u003cTASK\u003e\n f_midi2_set_alt+0x11c/0xf00 drivers/usb/gadget/function/f_midi2.c:1296\n composite_setup+0x1ffd/0x3480 drivers/usb/gadget/composite.c:1933\n configfs_composite_setup+0xbd/0x100 drivers/usb/gadget/configfs.c:1877"
    }
  ],
  "id": "CVE-2026-90024",
  "lastModified": "2026-09-16T11:17:15.357",
  "metrics": {},
  "published": "2026-09-16T11:17:15.357",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4079f19a0e1ce76f1e21a398f02aca150ceaaf61"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/51ddc55c75087ac25342f6d73d3aeaf14f59bd76"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5b92f6a0c7c01efbb335d837ecdf34d38d98720f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9c3d5091e3568ed48ac4c5b08a78eb06fad0d70a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f0efaf1872949e96d213c8e910fd9517f7d7c406"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-85H2-WVW9-QF62

Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 12:30

Details

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs

A null-pointer dereference occurs in f_midi2_free_ep_reqs() when attempting to clean up an endpoint that was never initialized.

When configuring the MIDI 2.0 gadget via configfs and setting the block direction to SNDRV_UMP_DIR_INPUT, the initialization of the midi1_ep_out endpoint is explicitly skipped during the gadget bind phase (f_midi2_bind()). As a result, the usb_ep->card field remains NULL.

Later, when the host sets the alternate setting, f_midi2_set_alt() unconditionally stops both the IN and OUT endpoints by calling f_midi2_stop_eps(), which in turn calls f_midi2_free_ep_reqs() for both endpoints. When f_midi2_free_ep_reqs() is called for the uninitialized midi1_ep_out, it attempts to dereference usb_ep->card to determine the number of requests to free, leading to a crash.

Fix this by using usb_ep->num_reqs instead of usb_ep->card->info.num_reqs in f_midi2_free_ep_reqs(). usb_ep->num_reqs is correctly set during f_midi2_init_ep() and remains 0 if the endpoint was never initialized, safely avoiding the loop. For consistency, apply the same change to f_midi2_alloc_ep_reqs().

Oops: general protection fault, probably for non-canonical address 0xdffffc00000000ee: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000770-0x0000000000000777] ... RIP: 0010:f_midi2_free_ep_reqs drivers/usb/gadget/function/f_midi2.c:1166 [inline] RIP: 0010:f_midi2_stop_eps+0x28e/0x4d0 drivers/usb/gadget/function/f_midi2.c:1246 ... Call Trace: f_midi2_set_alt+0x11c/0xf00 drivers/usb/gadget/function/f_midi2.c:1296 composite_setup+0x1ffd/0x3480 drivers/usb/gadget/composite.c:1933 configfs_composite_setup+0xbd/0x100 drivers/usb/gadget/configfs.c:1877

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{
  "affected": [],
  "aliases": [
    "CVE-2026-90024"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T11:17:15Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs\n\nA null-pointer dereference occurs in f_midi2_free_ep_reqs() when attempting\nto clean up an endpoint that was never initialized.\n\nWhen configuring the MIDI 2.0 gadget via configfs and setting the block\ndirection to SNDRV_UMP_DIR_INPUT, the initialization of the midi1_ep_out\nendpoint is explicitly skipped during the gadget bind phase\n(f_midi2_bind()). As a result, the usb_ep-\u003ecard field remains NULL.\n\nLater, when the host sets the alternate setting, f_midi2_set_alt()\nunconditionally stops both the IN and OUT endpoints by calling\nf_midi2_stop_eps(), which in turn calls f_midi2_free_ep_reqs() for both\nendpoints. When f_midi2_free_ep_reqs() is called for the uninitialized\nmidi1_ep_out, it attempts to dereference usb_ep-\u003ecard to determine the\nnumber of requests to free, leading to a crash.\n\nFix this by using usb_ep-\u003enum_reqs instead of usb_ep-\u003ecard-\u003einfo.num_reqs\nin f_midi2_free_ep_reqs(). usb_ep-\u003enum_reqs is correctly set during\nf_midi2_init_ep() and remains 0 if the endpoint was never initialized,\nsafely avoiding the loop. For consistency, apply the same change to\nf_midi2_alloc_ep_reqs().\n\nOops: general protection fault, probably for non-canonical address\n0xdffffc00000000ee: 0000 [#1] SMP KASAN NOPTI\nKASAN: null-ptr-deref in range [0x0000000000000770-0x0000000000000777]\n...\nRIP: 0010:f_midi2_free_ep_reqs drivers/usb/gadget/function/f_midi2.c:1166\n[inline]\nRIP: 0010:f_midi2_stop_eps+0x28e/0x4d0\ndrivers/usb/gadget/function/f_midi2.c:1246\n...\nCall Trace:\n \u003cTASK\u003e\n f_midi2_set_alt+0x11c/0xf00 drivers/usb/gadget/function/f_midi2.c:1296\n composite_setup+0x1ffd/0x3480 drivers/usb/gadget/composite.c:1933\n configfs_composite_setup+0xbd/0x100 drivers/usb/gadget/configfs.c:1877",
  "id": "GHSA-85h2-wvw9-qf62",
  "modified": "2026-09-16T12:30:45Z",
  "published": "2026-09-16T12:30:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90024"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4079f19a0e1ce76f1e21a398f02aca150ceaaf61"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/51ddc55c75087ac25342f6d73d3aeaf14f59bd76"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b92f6a0c7c01efbb335d837ecdf34d38d98720f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c3d5091e3568ed48ac4c5b08a78eb06fad0d70a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f0efaf1872949e96d213c8e910fd9517f7d7c406"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-90024 (GCVE-0-2026-90024)

FKIE_CVE-2026-90024

GHSA-85H2-WVW9-QF62

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