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Vulnerabilities

Vulnerability · CVE-2026-5398

The implementation of TIOCNOTTY failed to clear a back-pointer from the structure representing the controlling terminal to the calling process' session.

Published Apr 22, 2026 · catalog updated Jun 17, 2026 · The implementation of TIOCNOTTY

Check if you run it

No confirmed exploitation is on record for CVE-2026-5398. EPSS is 0.18%. Act only if a listed version of The implementation of TIOCNOTTY is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The implementation of TIOCNOTTY).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.18%
Remediation
Advisory link
Affected products
cpe freebsd/freebsd

The implementation of TIOCNOTTY failed to clear a back-pointer from the structure representing the controlling terminal to the calling process' session. If the invoking process then exits, the terminal structure may end up containing a pointer to freed memory. A malicious process can abuse the dangling pointer to grant itself root privileges.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe freebsd/freebsd13.5

How to fix CVE-2026-5398

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-5398. EPSS is 0.18%. Act only if a listed version of The implementation of TIOCNOTTY is installed.

Which versions are affected?

Compare what you have installed with 13.5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-416: Use After Free. EPSS 0.18%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 22, 2026 · NIST NVD

    Detected

    The implementation of TIOCNOTTY failed to clear a back-pointer from the structure representing the controlling terminal to the calling process' session. If the invoking process then exits, the terminal structure may end up containing a pointer to freed memory. A malicious process can abuse the dangling pointer to grant itself root privileges.

  2. Jun 17, 2026 · NIST NVD

    Updated

    The implementation of TIOCNOTTY failed to clear a back-pointer from the structure representing the controlling terminal to the calling process' session. If the invoking process then exits, the terminal structure may end up containing a pointer to freed memory. A malicious process can abuse the dangling pointer to grant itself root privileges.

Sources

  • CVE.orgVulnerability recordCVE-2026-5398

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-5398

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-5398

    The implementation of TIOCNOTTY failed to clear a back-pointer from the structure representing the controlling terminal to the calling process' session. If the invoking process then exits, the terminal structure may end up containing a pointer to freed memory. A malicious proce

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.