FreeBSD-SA-26:37.vm

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:37.vm Security Advisory The FreeBSD Project Topic: Use-after-free in device pager page list Category: core Module: vm Announced: 2026-06-30 Credits: slidybat...

FreeBSD Security Advisory - FreeBSD-SA-26:44.posixshm

FreeBSD Security Advisory - Pages belonging to largepage shared memory objects were not explicitly wired. When sendfile2 transmitted such an object with the SFNOCACHE flag, it freed the underlying pages after transmission even though existing mappings still referred to them. Separately, certain...

PT-2026-71933

Name of the Vulnerable Software and Affected Versions FreeBSD affected versions not specified Description Insufficient input validation in the implementation of largepage shared memory objects allows an unprivileged local user to access freed kernel memory. This occurs because certain system call...

PT-2026-55922

Name of the Vulnerable Software and Affected Versions FreeBSD affected versions not specified Description A use-after-free issue exists in the tcp rack.ko module of the TCP RACK setsockopt2 handler. The handler releases the connection lock to copy option data from userspace and subsequently...

FreeBSD : PostgresSQL JDBC -- Silent channel-binding authentication downgrade via unsupported certificate algorithms (7701f760-745c-11f1-bc50-6cc21735f730)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 7701f760-745c-11f1-bc50-6cc21735f730 advisory. PostgreSQL project reports: channelBinding=require connections can be silently downgraded from...

FreeBSD-kernel -- Kernel stack disclosure in 32-bit compatibility support

Problem Description: The compat32 kevent handler translates a 64-bit kevent struct into a stack- declared 32-bit struct. It did not first zero the stack struct. Impact: An unprivileged user may observe a small amount of uninitialized kernel stack data, which may contain sensitive information...

FreeBSD -- unlinkat(2) ignores AT_RESOLVE_BENEATH flag

Problem Description: The kernel function that implements unlinkat2 and funlinkat2 validated the ATRESOLVEBENEATH flag but failed to pass it through to the underlying path lookup. The flag was silently dropped, so path resolution was not actually restricted. Impact: A process that uses...

FreeBSD -- Remote DOS via uninitialized memory access in KTLS receive

Problem Description: When building the iovec array for a received TLS 1.2 CBC record, ktlsocftlscbcdecrypt incremented the iovec index for every mbuf in the chain, including mbufs that were skipped because they contained only TLS header bytes. This left uninitialized entries in the iovec array. T...

FreeBSD -- Multiple vulnerabilities in OpenZFS

Problem Description: The ZFSIOCUSERSPACEMANY ioctl, used by zfs-userspace8, truncated a 64-bit output buffer size to a 32-bit integer for the kernel allocation, but used the original 64-bit size as the buffer limit when writing records. The ZFSIOCRECVNEW ioctl, in the heal receive path, similarly...

FreeBSD -- Local privilege escalation via execve(2) TOCTOU race

Problem Description: During execve2 of a SUID binary, the new virtual address space is installed before the process credentials are updated. During this window, a process running as the same user can access the target process's memory via procfs or linprocfs, because the kernel's debugging...

PT-2026-71930

Name of the Vulnerable Software and Affected Versions FreeBSD affected versions not specified Description An issue exists in the implementation of largepage shared memory objects where pages were not explicitly wired. When the sendfile2 function transmits such an object using the SF NOCACHE flag,...

FreeBSD-SA-26:48.compat32

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:48.compat32 Security Advisory The FreeBSD Project Topic: Kernel stack disclosure in 32-bit compatibility support Category: core Module: kernel compat32...

FreeBSD-SA-26:41.libalias

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:41.libalias Security Advisory The FreeBSD Project Topic: Buffer overflow in libalias RTSP handler Category: core Module: libalias Announced: 2026-06-30...

FreeBSD-SA-26:40.zfs

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:40.zfs Security Advisory The FreeBSD Project Topic: Multiple vulnerabilities in OpenZFS Category: contrib Module: openzfs Announced: 2026-06-30 Credits:...

PT-2026-55921

Name of the Vulnerable Software and Affected Versions FreeBSD affected versions not specified Description The RTSP handler in the libalias library rewrites outgoing packets into a fixed-length stack buffer without verifying if the rewritten data fits within the buffer or if the result fits back...

FreeBSD -- Kernel stack disclosure in Linux compatibility layer

Problem Description: The Linux waitid implementation translates a FreeBSD siginfot struct into a stack-declared Linux siginfot. It did not first zero the stack struct. Impact: An unprivileged user may observe 104 bytes of uninitialized kernel stack data, which may contain sensitive information...

FreeBSD -- Buffer overflow in libalias RTSP handler

Problem Description: The RTSP handler in libalias rewrote outgoing packets into a fixed-length stack buffer without checking whether the rewritten data fit in the buffer, or whether the result fit back in the original packet. Impact: A host sending crafted RTSP traffic from inside a NAT gateway...

FreeBSD -- Jail reference count underflow

Problem Description: When the JAILATDESC flag is specified, kernjailset and kernjailget released the reference to the caller's current prison before looking up the jail descriptor. If the descriptor lookup failed, error-handling paths released the same reference a second time. Impact: An...

FreeBSD -- Use-after-free in TCP RACK stack option handler

Problem Description: The RACK setsockopt2 handler drops the connection lock in order to copy option data from userspace, then reacquires the lock. After reacquiring, it verifies that the TCP stack had not been switched away, but did not reload its pointer to the stack's per-connection control...

FreeBSD-SA-26:46.ktls

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:46.ktls Security Advisory The FreeBSD Project Topic: Remote DOS via uninitialized memory access in KTLS receive Category: core Module: ktls Announced:...