CVE-2022-49545 (GCVE-0-2022-49545)
Vulnerability from cvelistv5
Published
2025-02-26 02:13
Modified
2026-08-05 08:55
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Cancel pending work at closing a MIDI substream At closing a USB MIDI output substream, there might be still a pending work, which would eventually access the rawmidi runtime object that is being released. For fixing the race, make sure to cancel the pending work at closing.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/midi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/midi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.121",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.46",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.121",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.46",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17.14",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18.3",
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                  "vulnerable": true
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                  "versionEndExcluding": "5.19",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Cancel pending work at closing a MIDI substream\n\nAt closing a USB MIDI output substream, there might be still a pending\nwork, which would eventually access the rawmidi runtime object that is\nbeing released.  For fixing the race, make sure to cancel the pending\nwork at closing."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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": [
            {
              "lang": "en",
              "value": "AV:L - Triggered via local ALSA/OSS MIDI character devices (/dev/snd/midi*, /dev/sequencer) once a USB MIDI interface is bound; device presence is an environmental precondition, not a malicious-USB physical attack (same model as CVE-2024-44954 / CVE-2022-50719).\nAC:L - The attacker controls both sides of the race by writing MIDI data to queue snd_usbmidi_out_work and then closing/unsubscribing the substream to free the runtime, so success does not depend on external timing.\nPR:L - Only ordinary access to sound devices is required, which seat users get via udev uaccess ACLs or audio group membership; no CAP_SYS_ADMIN or root is needed.\nUI:N - The attacker opens the MIDI/sequencer device, writes to queue work, and closes it themselves; no separate victim action is required.\nS:U - The UAF and any resulting privilege escalation remain within the host kernel\u0027s security authority; this is not a VM escape or IOMMU/DMA boundary bypass.\nC:H - Use-after-free of the kmalloc-512 snd_rawmidi_runtime lets an attacker reclaim the object and steer subsequent reads in __snd_rawmidi_transmit_ack / transmit paths into attacker-controlled memory.\nI:H - The same reclaimable UAF is written (hw_ptr, avail, wake_up on runtime-\u003esleep) from the workqueue path, enabling heap corruption and control-flow hijack primitives.\nA:H - Even without controlled reclaim, the pending work dereferencing the freed runtime reliably causes a KASAN-detected use-after-free / kernel oops, so Availability is High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:55:37.233Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/40bdb5ec957aca5c5c1924602bef6b0ab18e22d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/11868ca21585561659c2575b0d6508ef8e9c4291"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e5fe2b6065541c6216a7a003b0cddf386be0d2d"
        },
        {
          "url": "https://git.kernel.org/stable/c/517dcef4d2dda0132648f1e4c079ed17bba4d1a4"
        },
        {
          "url": "https://git.kernel.org/stable/c/0125de38122f0f66bf61336158d12a1aabfe6425"
        }
      ],
      "title": "ALSA: usb-audio: Cancel pending work at closing a MIDI substream",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49545",
    "datePublished": "2025-02-26T02:13:58.363Z",
    "dateReserved": "2025-02-26T02:08:31.590Z",
    "dateUpdated": "2026-08-05T08:55:37.233Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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