CVE-2026-98742 (GCVE-0-2026-98742)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:47 – Updated: 2026-10-30 12:39
VLAI
Title
ALSA: seq: Serialize compat port-info ioctls
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b3defb791b26ea0683a93a4f49c77ec45ec96f10 , < 14e178c60ba1cea49186fcfccac93d66aa94e9e0 (git)
Affected: b3defb791b26ea0683a93a4f49c77ec45ec96f10 , < 4980768c5d092493be0deb20d1ee86aa661466f8 (git)
Affected: b3defb791b26ea0683a93a4f49c77ec45ec96f10 , < 2c0cce3a5a660270d65729b0f318d4e01470479d (git)
Affected: b3defb791b26ea0683a93a4f49c77ec45ec96f10 , < 2db234e163f0d211b69a4eebbec8aacc5a54a80e (git)
Affected: b3defb791b26ea0683a93a4f49c77ec45ec96f10 , < 413211dd31cb2ef2fc99fb0aa1a037a97509502c (git)
Affected: b3defb791b26ea0683a93a4f49c77ec45ec96f10 , < fc5c52848e405b6efb073db5035bb9ebaed11ec4 (git)
Affected: b3defb791b26ea0683a93a4f49c77ec45ec96f10 , < 702d92f361f65d9698c473c7599d471395dc4341 (git)
Affected: b3defb791b26ea0683a93a4f49c77ec45ec96f10 , < 95b2e0361c88753afa030c10698be0a1a5b67650 (git)
Affected: d6693160906d55ba376bf0b88b7c129762170162 (git)
Affected: 02cbce8576a31df8fca54aaec91ee081076bd79d (git)
Affected: 6aab3aa52366a0051e5abf8aae4616c42053fd8e (git)
Affected: f8a38ab4cd9624fc5ac8a7f965c7b20f5b62c03c (git)
Affected: 623e5c8ae32b39cc8baea83478695dc624935318 (git)
Affected: e4ff9f294629b65df3f7982cd4faf86b2856b9d7 (git)
Affected: c3162384aed4cfe3f1a1f40041f3ba8cd7704d88 (git)
Affected: 3.2.99 , < 3.3 (semver)
Affected: 3.16.54 , < 3.17 (semver)
Affected: 3.18.94 , < 3.19 (semver)
Affected: 4.1.50 , < 4.2 (semver)
Affected: 4.4.115 , < 4.5 (semver)
Affected: 4.9.78 , < 4.10 (semver)
Affected: 4.14.15 , < 4.15 (semver)
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Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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      "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."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/14e178c60ba1cea49186fcfccac93d66aa94e9e0"
        },
        {
          "url": "https://git.kernel.org/stable/c/4980768c5d092493be0deb20d1ee86aa661466f8"
        },
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          "url": "https://git.kernel.org/stable/c/2c0cce3a5a660270d65729b0f318d4e01470479d"
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          "url": "https://git.kernel.org/stable/c/413211dd31cb2ef2fc99fb0aa1a037a97509502c"
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          "url": "https://git.kernel.org/stable/c/702d92f361f65d9698c473c7599d471395dc4341"
        },
        {
          "url": "https://git.kernel.org/stable/c/95b2e0361c88753afa030c10698be0a1a5b67650"
        }
      ],
      "title": "ALSA: seq: Serialize compat port-info ioctls",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98742",
    "datePublished": "2026-10-18T15:47:27.137Z",
    "dateReserved": "2026-09-25T10:25:14.367Z",
    "dateUpdated": "2026-10-30T12:39:16.216Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98742",
      "date": "2026-11-05",
      "epss": "0.00176",
      "percentile": "0.07215"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-28T01:48:23.000Z",
      "cve": "CVE-2026-98742",
      "id": "msrc_CVE-2026-98742",
      "initial_release_date": "2026-10-20T01:07:09.000Z",
      "product_status:known_not_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ALSA: seq: Serialize compat port-info ioctls",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98742.json",
      "version": "4"
    },
    "nvd": {
      "cve": {
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                  },
                  {
                    "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"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-11-05T00:22:40+00:00",
      "cve": "CVE-2026-98742",
      "id": "CVE-2026-98742",
      "initial_release_date": "2026-10-18T15:47:27.137000+00:00",
      "product_status:known_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Use-after-free via race condition in ALSA sequencer compatibility ioctls",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98742.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-04T17:52:20Z",
      "cve": "CVE-2026-98742",
      "id": "CVE-2026-98742",
      "initial_release_date": "2026-10-18T23:42:47Z",
      "product_status:known_affected": "96",
      "product_status:known_not_affected": "252",
      "product_status:recommended": "65",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98742",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98742.json",
      "version": "5"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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Vulnerability timeline

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