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-2026-45259

CVE-2026-45259 affects FreeBSD where sigqueue(2) was allowed in capability mode but kern_sigqueue lacked a capability-mode check to restrict signal delivery to the caller’s own PID. The issue enables a capability-mode sandboxed process to signal other processes (including SIGKILL/SIGSTOP) within ...

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...

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...

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

CVE-2026-45256 affects FreeBSD thr_kill2(2). The kernel failed to verify the result of p_cansignal() before delivering a signal, allowing unprivileged local users who know target PIDs to signal processes they normally could not, including root-owned ones. This can lead to stopping or terminating ...

Astra Linux – Vulnerability found in Linux 6.12, 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...

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-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-26:28.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 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...

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...

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...

UBUNTU-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...

CVE-2025-68171

CVE-2025-68171 affects the Linux kernel x86 FPU path. The issue arises during signal delivery when an AMX-enabled task preempts a non-AMX task and modifies the XFD MSR, causing a mismatch between the saved fpstate.xfd and the CPU’s current XFD state. The function fpu__clear_user_states() does not...