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    CVE-2026-58093

    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.

    Published:Aug 26, 2026
    Last Modified:Aug 26, 2026
    EPS:Aug 26, 2026
    EPSS Score:0.00134
    CVSS Score:7

    Affected Products

    Vendor
    Freebsd
    Product
    Freebsd

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-58096 (CVSS 8.8) — LcpDecodeConfig() did not validate the length of received endpoint discriminator options against the minimum r…
    CVE-2026-58095 (CVSS 8.8) — mp_Enddisc() used incorrect length calculations when formatting endpoint discriminator addresses for display, …
    CVE-2026-58092 (CVSS 8.1) — In FreeBSD 15.0, the kernel structure used to represent user credentials changed: previously the primary group…
    CVE-2026-58091 (CVSS 7.8) — The implementation of this ioctl attempts to acquire locks on all channels in a sync group. If locking a chan…
    CVE-2026-58090 (CVSS 7.8) — The SOCK_STREAM receive path in the unix socket implementation failed to fully detach control messages from th…
    CVE-2026-58089 (CVSS 7.8) — When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4) is supposed to detach PMCs owned …
    CVE-2026-58088 (CVSS 7.4) — The ELF core dump code counted the number of dumpable VM map entries, allocated a buffer for the corresponding…
    CVE-2026-58087 (CVSS 7.8) — The GETALL and SETALL commands in semctl(2) recorded the number of semaphores in the target set, dropped the l…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High