FreeBSD -- Missing permission check in thr_kill2(2)

Problem Description: When used to deliver a signal to a specific thread, thrkill22 called pcansignal to determine whether the operation was permitted but did not check the result before delivering the signal. The signal was sent even when the permission check failed. The system call returned the...

FreeBSD -- Insufficient response validation in the ldns stub resolver

Problem Description: When used as a stub resolver over UDP, ldns failed to verify that a received response belonged to the outstanding query. It did not check that the response source address and port matched the query destination, that the transaction ID matched, or that the question section of...

FreeBSD -- Integer overflow in vt(4) CONS_HISTORY ioctl

Problem Description: The CONSHISTORY ioctl handler did not adequately validate the requested history size. A large value caused an integer overflow in the buffer size calculation, resulting in a heap allocation smaller than expected. Subsequent initialization of the buffer wrote beyond the end of...

FreeBSD -- Flaw in Linuxulator execution of setugid binaries

Problem Description: The Linuxulator determined whether a binary was set-user-ID or set-group-ID by checking the PSUGID process flag. During execve2, this flag is not yet set at the point where the auxiliary vector is constructed, so ATSECURE was incorrectly set to zero for set-user-ID and...

FreeBSD -- Multiple vulnerabilities in OpenSSL

Problem Description: Multiple issues have been reported as part of this advisory with different issues affecting different OpenSSL versions and therefore different FreeBSD versions. Instead of exhaustively listing detailed writeups for each issue, please see the referenced advisory from OpenSSL...

FreeBSD -- Use-after-free bug in the IPV6_MSFILTER socket option handler

Problem Description: The kernel handler for IPV6MSFILTER dropped a serializing lock in order to copy the source-filter list from userspace, then reacquired the lock. During this window another thread could free the multicast filter structure, leaving the handler with a stale pointer to freed...

FreeBSD -- Multiple vulnerabilities in the sound(4) mmap path

Problem Description: The sound4 driver contained two memory-safety errors in its mmap2 support. First, dspmmapsingle validated the requested mapping by checking the sum of the user-supplied offset and length against the buffer size. This addition could overflow, so that a large offset and length...

FreeBSD Security Advisory - FreeBSD-SA-26:35.openssl

FreeBSD Security Advisory - Multiple issues have been reported as part of this advisory with different issues affecting different OpenSSL versions and therefore different FreeBSD versions...

FreeBSD-SA-26:35.openssl

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:35.openssl Security Advisory The FreeBSD Project Topic: Multiple vulnerabilities in OpenSSL Category: contrib Module: openssl Announced: 2026-06-09 Credits:...

FreeBSD-SA-26:34.vt

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:34.vt Security Advisory The FreeBSD Project Topic: Integer overflow in vt4 CONSHISTORY ioctl Category: core Module: vt Announced: 2026-06-09 Credits: Ed Mast...

FreeBSD-SA-26:30.linux

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:30.linux Security Advisory The FreeBSD Project Topic: Flaw in Linuxulator execution of setugid binaries Category: core Module: linux Announced: 2026-06-09...

FreeBSD-SA-26:29.ip6_multicast

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:29.ip6multicast Security Advisory The FreeBSD Project Topic: Use-after-free bug in the IPV6MSFILTER socket option handler Category: core Module: ip6multicast...

FreeBSD-SA-26:27.sound

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:27.sound Security Advisory The FreeBSD Project Topic: Multiple vulnerabilities in the sound4 mmap path Category: core Module: sound Announced: 2026-06-09...

FreeBSD-SA-26:28.capsicum

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:28.capsicum Security Advisory The FreeBSD Project Topic: sigqueue2 missing capability mode restriction Category: core Module: capsicum Announced: 2026-06-09...

FreeBSD-SA-26:25.thr

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:25.thr Security Advisory The FreeBSD Project Topic: Missing permission check in thrkill22 Category: core Module: thr Announced: 2026-06-09 Credits: Yuxiang...

FreeBSD-SA-26:31.arm64

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:31.arm64 Security Advisory The FreeBSD Project Topic: Arm CPU errata may bypass page table permission changes Category: core Module: arm64 Announced:...

FreeBSD Security Advisory - FreeBSD-SA-26:29.ip6_multicast

FreeBSD Security Advisory - The kernel handler for IPV6MSFILTER dropped a serializing lock in order to copy the source-filter list from userspace, then reacquired the lock. During this window another thread could free the multicast filter structure, leaving the handler with a stale pointer to fre...

FreeBSD Security Advisory - FreeBSD-SA-26:36.ldns

FreeBSD Security Advisory - When used as a stub resolver over UDP, ldns failed to verify that a received response belonged to the outstanding query. It did not check that the response source address and port matched the query destination, that the transaction ID matched, or that the question...

FreeBSD Security Advisory - FreeBSD-SA-26:32.elf

FreeBSD Security Advisory - The ELF image activator cleared per-process ASLR preference flags for setuid binaries after the code that computes the PIE base address, rather than before. As a result, a user-requested ASLR disable was still in effect at the point where the base address was chosen...

FreeBSD Security Advisory - FreeBSD-SA-26:30.linux

FreeBSD Security Advisory - The Linuxulator determined whether a binary was set-user-ID or set-group-ID by checking the PSUGID process flag. During execve2, this flag is not yet set at the point where the auxiliary vector is constructed, so ATSECURE was incorrectly set to zero for set-user-ID and...