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CVE-2026-5398Kernel use-after-free bug in the TIOCNOTTY handler

Description

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.

Timeline

  1. ID reserved

    By freebsd

  2. · 20 days later

    Published

  3. · 1 day later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-5398, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High8.4CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Analyzed3.1High8.4CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.21% · top 89% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.

Affected products

  • FreeBSD · FreeBSD

    • affected 15.0-RELEASE – < p6
    • affected 14.4-RELEASE – < p2
    • affected 14.3-RELEASE – < p11
    • affected 13.5-RELEASE – < p12

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .