Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Ensure that the XFD state is preserved during signal delivery. Sean reported the following error when running KVM tests: WARNING: CPU: 232 PID: 15391 at xfdvalidatestate+0x65/0x70 Call Trace: fpuclearuserstates+0x9c/0x10...

libssh: libssh: denial of service via unchecked ProxyCommand fork() failure

A flaw was found in libssh. When ProxyCommand is used, an unchecked fork failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service...

CVE-2026-72183 landlock: Fix LANDLOCK_SCOPE_SIGNAL bypass on the SIGIO path

In the Linux kernel, the following vulnerability has been resolved: landlock: Fix LANDLOCKSCOPESIGNAL bypass on the SIGIO path LANDLOCKSCOPESIGNAL must prevent a sandboxed process from signaling processes outside its Landlock domain. It can be bypassed through the asynchronous SIGIO delivery path...

CVE-2026-72183: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: landlock: Fix LANDLOCKSCOPESIGNAL bypass on the SIGIO path LANDLOCKSCOPESIGNAL must prevent a sandboxed process from signaling processes outside its Landlock domain. It can be bypassed through the asynchronous SIGIO delivery path...

CVE-2026-45259

The FreeBSD kernel contains a vulnerability in the kern_sigqueue implementation where sigqueue(2) lacks a capability mode check. This allows a process running in Capsicum capability mode to bypass sandbox restrictions and send signals to any process it could signal under standard Unix permissions...

CVE-2026-45259 sigqueue(2) missing capability mode restriction

sigqueue2 was marked as permitted in capability mode with the introduction of Capsicum in 2011, but the implementation of kernsigqueue did not include a capability mode check restricting signal delivery to the calling process's own PID. A process in capability mode can use sigqueue2 to send signa...

CVE-2026-45259

sigqueue2 was marked as permitted in capability mode with the introduction of Capsicum in 2011, but the implementation of kernsigqueue did not include a capability mode check restricting signal delivery to the calling process's own PID. A process in capability mode can use sigqueue2 to send signa...

CVE-2026-45259 sigqueue(2) missing capability mode restriction

sigqueue2 was marked as permitted in capability mode with the introduction of Capsicum in 2011, but the implementation of kernsigqueue did not include a capability mode check restricting signal delivery to the calling process's own PID. A process in capability mode can use sigqueue2 to send signa...

PT-2026-53061

Name of the Vulnerable Software and Affected Versions FreeBSD affected versions not specified Description The implementation of the kern sigqueue function failed to include a capability mode check. This allows a process operating in Capsicum capability mode—a security framework that restricts...

CVE-2026-45259: Incorrect Privilege Assignment

sigqueue2 was marked as permitted in capability mode with the introduction of Capsicum in 2011, but the implementation of kernsigqueue did not include a capability mode check restricting signal delivery to the calling process's own PID. A process in capability mode can use sigqueue2 to send signa...

EUVD-2026-39776

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 resulting error to th...

CVE-2026-52946

A flaw was found in the Linux kernel. A lock order deadlock can occur in the sendsigio and sendsigurg functions when a process group receives a signal. This vulnerability, caused by an unsafe lock order during software interrupts SOFTIRQ in asynchronous I/O fasync signaling, could allow a remote...

CVE-2026-45256

The FreeBSD operating system is vulnerable to a privilege management flaw in the thr_kill2(2) system call. The kernel calls p_cansignal() to verify permissions but fails to check the return value before delivering the signal. This allows an unprivileged local user to bypass permission checks and ...

PT-2026-52723

When used to deliver a signal to a specific thread, thr kill22 called p cansignal 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 resulting error to...

FreeBSD : FreeBSD -- sigqueue(2) missing capability mode restriction (94f20492-6473-11f1-958d-bc241121aa0a)

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 94f20492-6473-11f1-958d-bc241121aa0a advisory. sigqueue2 was marked as permitted in capability mode with the introduction of Capsicum in 2011, but the...

FreeBSD Security Advisory - FreeBSD-SA-26:28.capsicum

FreeBSD Security Advisory - sigqueue2 was marked as permitted in capability mode with the introduction of Capsicum in 2011, but the implementation of kernsigqueue did not include a capability mode check restricting signal delivery to the calling process's own PID...

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 Security Advisory - FreeBSD-SA-26:25.thr

FreeBSD Security Advisory - 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 return...

SUSE CVE-2025-68171

In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Ensure XFD state on signal delivery Sean reported 1 the following splat when running KVM tests: WARNING: CPU: 232 PID: 15391 at xfdvalidatestate+0x65/0x70 Call Trace: fpuclearuserstates+0x9c/0x100...

EUVD-2025-203725

In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Ensure XFD state on signal delivery Sean reported 1 the following splat when running KVM tests: WARNING: CPU: 232 PID: 15391 at xfdvalidatestate+0x65/0x70 Call Trace: fpuclearuserstates+0x9c/0x100...