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The FreeBSD Project issued security advisory FreeBSD-SA-26:10.tty for CVE-2026-5398, a kernel use-after-free flaw in the TIOCNOTTY handler that affects all supported FreeBSD versions. The vulnerability occurs because TIOCNOTTY does not clear a back-pointer from the controlling terminal structure to the calling process session, leaving a dangling pointer after the process exits.
FreeBSD warned that a malicious unprivileged local process could exploit the bug to gain root privileges. The project released fixes across supported stable and release branches on 2026-04-21, said no workaround is available, and directed administrators to apply the updates and reboot affected systems.
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2 events from the most recent confirmed update back to the earliest known activity.
FreeBSD released patches for the vulnerability across supported stable and release branches and stated that no workaround was available. Users were instructed to update their systems and reboot to apply the fix.
The FreeBSD Project published security advisory FreeBSD-SA-26:10.tty for CVE-2026-5398, describing a kernel use-after-free bug in the TIOCNOTTY handler affecting all supported FreeBSD versions. The advisory said an unprivileged local process could exploit the dangling pointer condition to gain root privileges.
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FreeBSD issued security updates for **FreeBSD 14.3** and **FreeBSD 13.5** to address multiple vulnerabilities, including a critical **jail/chroot escape** tracked as **CVE-2025-15576**. The flaw allows a process to break out of FreeBSD jail isolation by abusing **file descriptor (fd) exchange** between jails, resulting in loss of filesystem isolation and potential access to the host filesystem; the Canadian Centre for Cyber Security urged administrators to review the advisories and apply updates. Technical reporting indicates CVE-2025-15576 can be triggered in specific configurations where **two sibling jails** share a directory via a `nullfs` mount and can communicate over a **Unix domain socket**. In that scenario, cooperating processes can exchange directory file descriptors in a way that causes the kernel’s pathname lookup checks to fail to properly enforce the jail root boundary, enabling access to directories outside the jail. No workaround was noted; patching is required. Separately, FreeBSD also addressed **CVE-2026-3038**, described as a **local DoS** with possible **privilege escalation** via routing sockets.
Jun 29, 2026
FreeBSD released security updates for **22 vulnerabilities** across the operating system, including multiple flaws that could lead to **remote code execution**, **local privilege escalation to root**, **denial of service**, **memory corruption**, and **information disclosure**. The most severe issue, **`CVE-2026-49420`**, affects `libalias`, where improper handling of **RTSP** traffic during NAT processing can allow **remote code execution as root** on systems using **`ipfw` NAT** or **`natd`**. The fixes were shipped in **FreeBSD 15.1-RELEASE-p1**, **15.0-RELEASE-p11**, **14.4-RELEASE-p7**, and **14.3-RELEASE-p16**. Additional patched components include `execve`, **Jail**, **OpenZFS**, **Linuxulator**, **KTLS**, `sound`, `vt`, `ptrace`, IPv6 multicast filtering, `tcp_rack`, `compat32`, `iconv`, and pathname resolution protections such as **`AT_RESOLVE_BENEATH`**, with the advisory noting that **13 of the issues** could enable privilege escalation to root.
Jul 7, 2026
FreeBSD issued security advisory **FreeBSD-SA-26:11.amd64** for **`CVE-2026-6386`**, a kernel flaw in the amd64 routine **`pmap_pkru_update_range()`** that mishandles **1GB large page mappings**. The bug affects all supported FreeBSD versions on amd64 and arises when largepage mappings created with **`shm_create_largepage(3)`** are not handled correctly, causing a page directory page entry to be misinterpreted as a pointer to another page table page. FreeBSD warned that an **unprivileged local user** could exploit the issue to make the kernel treat userspace memory as a page table page and overwrite memory the application should not be able to access, creating a serious path to memory corruption and potential privilege impact. The project said **no workaround is available** and advised administrators to upgrade to corrected branches released after **2026-04-21** and reboot affected systems; fixes were published for **stable/15**, **releng/15.0**, **stable/14**, **releng/14.4**, **releng/14.3**, **stable/13**, and **releng/13.5**.
Jun 29, 2026