CVE-2021-47454

CVE-2021-47454 describes a Linux kernel vulnerability affecting powerpc SMP idle handling. The issue arises with PREEMPT_COUNT=y: when a CPU is offlined and onlined, the idle task’s preempt count could be decremented in CPU offline, triggering a scheduling panic. The root cause is that powerpc ar...

CVE-2021-47454: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: powerpc/smp: do not decrement idle task preempt count in CPU offline With PREEMPTCOUNT=y, when a CPU is offlined and then onlined again, we get: BUG: scheduling while atomic: swapper/1/0/0x00000000 no locks held by swapper/1/0...

CVE-2023-52831

In the Linux kernel, the following vulnerability has been resolved: cpu/hotplug: Don't offline the last non-isolated CPU If a system has isolated CPUs via the "isolcpus=" command line parameter, then an attempt to offline the last housekeeping CPU will result in a WARNON when rebuilding the...

kernel: thermal: intel_powerclamp: Use get_cpu() instead of smp_processor_id() to avoid crash

A null pointer dereference flaw was found in the Linux kernel thermal/intelpowerclamp driver. When CPU 0 is offline and the intelpowerclamp driver attempts to inject idle cycles, the code incorrectly calls smpprocessorid preemptively, which triggers a kernel BUG. This occurs because the function...

GSD-2021-1001889 powerpc/smp: do not decrement idle task preempt count in CPU offline

powerpc/smp: do not decrement idle task preempt count in CPU offline This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.14.15 by commit...

UVI-2021-1001889 powerpc/smp: do not decrement idle task preempt count in CPU offline

powerpc/smp: do not decrement idle task preempt count in CPU offline This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.14.15 by commit...

GSD-2021-1001849 powerpc/smp: do not decrement idle task preempt count in CPU offline

powerpc/smp: do not decrement idle task preempt count in CPU offline This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.10.76 by commit...

UVI-2021-1001849 powerpc/smp: do not decrement idle task preempt count in CPU offline

powerpc/smp: do not decrement idle task preempt count in CPU offline This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.10.76 by commit...

PT-2021-30354

Name of the Vulnerable Software and Affected Versions Linux Kernel versions prior to v5.14.15 Description The issue is related to the powerpc/smp component, specifically concerning the handling of the idle task preempt count during CPU offline operations. The actual impact and potential for...

PT-2021-26319

Name of the Vulnerable Software and Affected Versions: Linux Kernel versions 5.10.50 through 5.10.75 Description: The issue is related to the powerpc/smp component, specifically concerning the handling of the idle task preempt count during CPU offline operations. The actual impact and potential f...

PT-2021-26359

Name of the Vulnerable Software and Affected Versions: Linux Kernel versions v5.14 through v5.14.14 Description: The issue is related to the powerpc/smp component, specifically concerning the handling of the idle task preempt count during CPU offline operations. The actual impact and potential fo...

PT-2021-30314

Name of the Vulnerable Software and Affected Versions Linux Kernel versions 5.10.50 through 5.10.75 Description The issue is related to the powerpc/smp component, specifically concerning the handling of the idle task preempt count during CPU offline operations. The actual impact and potential for...

PT-2024-11448

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 5.15.0-rc2+ Description The issue arises when a CPU is offlined and then onlined again with PREEMPT COUNT=y, resulting in a BUG: scheduling while atomic error. This occurs because the arch cpu idle dead function...

XENMEM_aquire_resources Error Path DoS (XSA-334)

A denial of service DoS vulnerability exists in Xen servers XENMEMacquireresource due to an error path exiting without releasing an RCU Read, Copy, Update reference. An authenticated, local attacker can exploit this issue, via a malicious HVM stubdomain which can cause an RCU reference to be...

CVE-2020-25598

An issue was discovered in Xen 4.14.x. There is a missing unlock in the XENMEMacquireresource error path. The RCU Read, Copy, Update mechanism is a synchronisation primitive. A buggy error path in the XENMEMacquireresource exits without releasing an RCU reference, which is conceptually similar to...

Moderate: Red Hat Security Advisory: kernel security and bug fix update

An update for kernel is now available for Red Hat Enterprise Linux 7.7 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for...

Important: Red Hat Security Advisory: kernel security and bug fix update

An update for kernel is now available for Red Hat Enterprise Linux 7.5 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for...