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CVE-2026-58093

Kernel use-after-free via tty ioctls

HIGH
7
CVSS Score
Published: August 26, 2026 at 05:33 AM UTC
Updated: September 24, 2026 at 01:37 PM UTC
1 product affected across 1 vendorFreeBSD

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Severity
HIGH7
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

The TIOCSCTTY ioctl handler drops the tty lock in order to acquire the process tree lock. After reacquiring the tty lock, the handler did not revalidate the state of the terminal, and could proceed to link a terminal that was concurrently being destroyed to the calling process' session. An unprivileged local user can exploit this race condition to escalate privileges.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

FreeBSD· Freebsd
95%
14.4-RELEASE ≤ v < p915.0-RELEASE ≤ v < p1315.1-RELEASE ≤ v < p314.4 p114.4 p214.4 p314.4 p414.4 p514.4 p614.4 p714.4 p814.4-RELEASE15.0 p115.0 p1015.0 p1115.0 p1215.0 p215.0 p315.0 p415.0 p515.0 p615.0 p715.0 p815.0 p915.0-RELEASE15.1 p115.1 p215.1-RELEASE
Affected range stops below p13, so it looks safe — our inference, not a vendor statement
Affected range stops below p3, so it looks safe — our inference, not a vendor statement
Affected range stops below p9, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Source: cverecord
https://security.freebsd.org/advisories/FreeBSD-SA-26:60.tty.asc
Vendor Advisory
Source: cverecord
https://security.freebsd.org/advisories/FreeBSD-SA-26:62.tty.asc

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7HIGHCISA-ADP
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-362CWE-416

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