CVE-2026-98742

Status: ReceivedUnscored—

Severity—Unscored

Exploitation probability0.17 %higher than 6% of CVEs

Active exploitationNonot in the CISA catalog

Public exploitNot knownno public code found

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.

Read full descriptionShow less

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.

CVSS

NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.17 %
Percentile among all scored CVEs: 6
Score date: 10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux Kernel^AI

References

Show 4 references

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-98742",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10",
              "lessThan": "413211dd31cb2ef2fc99fb0aa1a037a97509502c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10",
              "lessThan": "fc5c52848e405b6efb073db5035bb9ebaed11ec4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10",
              "lessThan": "702d92f361f65d9698c473c7599d471395dc4341",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10",
              "lessThan": "95b2e0361c88753afa030c10698be0a1a5b67650",
              "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"
            },
            {
              "status": "affected",
              "version": "3.2.99",
              "lessThan": "3.3",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "3.16.54",
              "lessThan": "3.17",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "3.18.94",
              "lessThan": "3.19",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "4.1.50",
              "lessThan": "4.2",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "4.4.115",
              "lessThan": "4.5",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "4.9.78",
              "lessThan": "4.10",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "4.14.15",
              "lessThan": "4.15",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "sound/core/seq/seq_compat.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "sound/core/seq/seq_compat.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-18T16:17:27.920",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/413211dd31cb2ef2fc99fb0aa1a037a97509502c",
      "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",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "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->ioctl_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."
    }
  ],
  "lastModified": "2026-10-19T10:19:38.370",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}