CVE-2026-98753

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:

tty: tty_port: restore TTY_IO_ERROR on activation failure

Make sure to restore the TTY_IO_ERROR flag if activation fails to prevent I/O attempts on a port that is gone or powered down.

This specifically avoids issues like kernel panic due to unclocked accesses or NULL-pointer dereferences when accessing powered down or deregistered ports when a TTY ioctl races with hangup and open.

Note that the flag is set again in tty_port_close() but not restoring it on activation failure leaves a window where drivers fail to handle the ioctl-hangup race.

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)

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{
  "id": "CVE-2026-98753",
  "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": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4",
              "lessThan": "34d4f67472ef7a744970b772a8565ddc727788e2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4",
              "lessThan": "7021acc84c2e0add77a1a33152e3a1e428fdbfdb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4",
              "lessThan": "6388409b711eb91b14fa075a4d861ccc4df1cfe7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4",
              "lessThan": "56964f6a31238fb41d5830bb42520c5b10ff7d8f",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/tty/tty_port.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.33"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.33",
              "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": [
            "drivers/tty/tty_port.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-18T16:17:29.103",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/34d4f67472ef7a744970b772a8565ddc727788e2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/56964f6a31238fb41d5830bb42520c5b10ff7d8f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6388409b711eb91b14fa075a4d861ccc4df1cfe7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7021acc84c2e0add77a1a33152e3a1e428fdbfdb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: tty_port: restore TTY_IO_ERROR on activation failure\n\nMake sure to restore the TTY_IO_ERROR flag if activation fails to\nprevent I/O attempts on a port that is gone or powered down.\n\nThis specifically avoids issues like kernel panic due to unclocked\naccesses or NULL-pointer dereferences when accessing powered down or\nderegistered ports when a TTY ioctl races with hangup and open.\n\nNote that the flag is set again in tty_port_close() but not restoring it\non activation failure leaves a window where drivers fail to handle the\nioctl-hangup race."
    }
  ],
  "lastModified": "2026-10-19T10:19:39.457",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}