FKIE_CVE-2026-98742

Vulnerability from fkie_nvd - Published: 2026-10-18 16:17 - Updated: 2026-10-30 13:21
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Serialize compat port-info ioctls The native sequencer ioctl path serializes handler calls with client->ioctl_mutex, but the translated port-info compat path invokes the same handlers through snd_seq_kernel_client_ctl() without taking that mutex. This lets concurrent compat CREATE_PORT requests pass the port-count check before any request reaches the serialized insertion. The computed integer port index can then exceed the address field range and wrap to an existing index. Subsequent subscriber teardown can resolve the duplicate address to the wrong port and access a freed subscriber. Take ioctl_mutex while dispatching converted port-info requests, matching the native ioctl path. All translated port-info commands share this helper, so their accesses to the client port state are serialized as well.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/14e178c60ba1cea49186fcfccac93d66aa94e9e0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2c0cce3a5a660270d65729b0f318d4e01470479d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2db234e163f0d211b69a4eebbec8aacc5a54a80e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/413211dd31cb2ef2fc99fb0aa1a037a97509502c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4980768c5d092493be0deb20d1ee86aa661466f8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/702d92f361f65d9698c473c7599d471395dc4341
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/95b2e0361c88753afa030c10698be0a1a5b67650
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fc5c52848e405b6efb073db5035bb9ebaed11ec4
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/core/seq/seq_compat.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "14e178c60ba1cea49186fcfccac93d66aa94e9e0",
              "status": "affected",
              "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10",
              "versionType": "git"
            },
            {
              "lessThan": "4980768c5d092493be0deb20d1ee86aa661466f8",
              "status": "affected",
              "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10",
              "versionType": "git"
            },
            {
              "lessThan": "2c0cce3a5a660270d65729b0f318d4e01470479d",
              "status": "affected",
              "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10",
              "versionType": "git"
            },
            {
              "lessThan": "2db234e163f0d211b69a4eebbec8aacc5a54a80e",
              "status": "affected",
              "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10",
              "versionType": "git"
            },
            {
              "lessThan": "413211dd31cb2ef2fc99fb0aa1a037a97509502c",
              "status": "affected",
              "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10",
              "versionType": "git"
            },
            {
              "lessThan": "fc5c52848e405b6efb073db5035bb9ebaed11ec4",
              "status": "affected",
              "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10",
              "versionType": "git"
            },
            {
              "lessThan": "702d92f361f65d9698c473c7599d471395dc4341",
              "status": "affected",
              "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10",
              "versionType": "git"
            },
            {
              "lessThan": "95b2e0361c88753afa030c10698be0a1a5b67650",
              "status": "affected",
              "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d6693160906d55ba376bf0b88b7c129762170162",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "02cbce8576a31df8fca54aaec91ee081076bd79d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6aab3aa52366a0051e5abf8aae4616c42053fd8e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f8a38ab4cd9624fc5ac8a7f965c7b20f5b62c03c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "623e5c8ae32b39cc8baea83478695dc624935318",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e4ff9f294629b65df3f7982cd4faf86b2856b9d7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c3162384aed4cfe3f1a1f40041f3ba8cd7704d88",
              "versionType": "git"
            },
            {
              "lessThan": "3.3",
              "status": "affected",
              "version": "3.2.99",
              "versionType": "semver"
            },
            {
              "lessThan": "3.17",
              "status": "affected",
              "version": "3.16.54",
              "versionType": "semver"
            },
            {
              "lessThan": "3.19",
              "status": "affected",
              "version": "3.18.94",
              "versionType": "semver"
            },
            {
              "lessThan": "4.2",
              "status": "affected",
              "version": "4.1.50",
              "versionType": "semver"
            },
            {
              "lessThan": "4.5",
              "status": "affected",
              "version": "4.4.115",
              "versionType": "semver"
            },
            {
              "lessThan": "4.10",
              "status": "affected",
              "version": "4.9.78",
              "versionType": "semver"
            },
            {
              "lessThan": "4.15",
              "status": "affected",
              "version": "4.14.15",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/core/seq/seq_compat.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.273",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "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\nALSA: seq: Serialize compat port-info ioctls\n\nThe native sequencer ioctl path serializes handler calls with\nclient-\u003eioctl_mutex, but the translated port-info compat path invokes the\nsame handlers through snd_seq_kernel_client_ctl() without taking that\nmutex.\n\nThis lets concurrent compat CREATE_PORT requests pass the port-count\ncheck before any request reaches the serialized insertion. The computed\ninteger port index can then exceed the address field range and wrap to an\nexisting index. Subsequent subscriber teardown can resolve the duplicate\naddress to the wrong port and access a freed subscriber.\n\nTake ioctl_mutex while dispatching converted port-info requests, matching\nthe native ioctl path. All translated port-info commands share this\nhelper, so their accesses to the client port state are serialized as\nwell."
    }
  ],
  "id": "CVE-2026-98742",
  "lastModified": "2026-10-30T13:21:22.930",
  "metrics": {},
  "published": "2026-10-18T16:17:27.920",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/14e178c60ba1cea49186fcfccac93d66aa94e9e0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2c0cce3a5a660270d65729b0f318d4e01470479d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2db234e163f0d211b69a4eebbec8aacc5a54a80e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/413211dd31cb2ef2fc99fb0aa1a037a97509502c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4980768c5d092493be0deb20d1ee86aa661466f8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/702d92f361f65d9698c473c7599d471395dc4341"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/95b2e0361c88753afa030c10698be0a1a5b67650"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fc5c52848e405b6efb073db5035bb9ebaed11ec4"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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