kernel: KVM: nVMX: missing IBPB when exiting from nested guest can lead to Spectre v2 attacks

A flaw was found in the KVM's Intel nested virtualization feature nVMX. Since L1 and L2 shared branch prediction modes guest-user and guest-kernel, KVM did not protect indirect branches in L1 from steering by a malicious agent in L2. This could allow a malicious nested guest to carry out Spectre ...

PT-2023-2825 · Linux +2 · Linux Kernel +2

Name of the Vulnerable Software and Affected Versions: Linux Kernel affected versions not specified Description: The issue is related to a synchronization error in the rcu barrier function of the ksmbd module in the Linux kernel, which can be exploited to elevate privileges and execute arbitrary...

Siemens SCALANCE X Expected Behavior Violation (CVE-2019-6569)

The monitor barrier of the affected products insufficiently blocks data from being forwarded over the mirror port into the mirrored network. An attacker could use this behavior to transmit malicious packets to systems in the mirrored network, possibly influencing their configuration and runtime...

OESA-2023-1143 kernel security update

The Linux Kernel, the operating system core itself. Security Fixes: The Linux kernel does not correctly mitigate SMT attacks, as discovered through a strange pattern in the kernel API using STIBP as a mitigation1 https://docs.kernel.org/userspace-api/specctrl.html, leaving the process exposed for...

SUSE CVE-2017-12179

xorg-x11-server before 1.19.5 was vulnerable to integer overflow in SProcXIBarrierReleasePointer functions allowing malicious X client to cause X server to crash or possibly execute arbitrary code...

SUSE CVE-2020-10767

A flaw was found in the Linux kernel before 5.8-rc1 in the implementation of the Enhanced IBPB Indirect Branch Prediction Barrier. The IBPB mitigation will be disabled when STIBP is not available or when the Enhanced Indirect Branch Restricted Speculation IBRS is available. This flaw allows a loc...

SUSE CVE-2020-11739

An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service or possibly gain privileges because of missing memory barriers in read-write unlock paths. The read-write unlock paths don't contain a memory barrier. On Arm, this means a processor is allowed to...

SUSE CVE-2020-24371

lgc.c in Lua 5.4.0 mishandles the interaction between barriers and the sweep phase, leading to a memory access violation involving collectgarbage...

SUSE CVE-2021-4009

A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SProcXFixesCreatePointerBarrier function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability...

SUSE CVE-2021-29650

An issue was discovered in the Linux kernel before 5.11.11. The netfilter subsystem allows attackers to cause a denial of service panic because net/netfilter/xtables.c and include/linux/netfilter/xtables.h lack a full memory barrier upon the assignment of a new table value, aka CID-175e476b8cdf...

SUSE CVE-2021-42072

An issue was discovered in Barrier before 2.4.0. The barriers component aka the server-side implementation of Barrier does not sufficiently verify the identify of connecting clients. Clients can thus exploit weaknesses in the provided protocol to cause denial-of-service or stage further attacks...

SUSE CVE-2021-42073

An issue was discovered in Barrier before 2.4.0. An attacker can enter an active session state with the barriers component aka the server-side implementation of Barrier simply by supplying a client label that identifies a valid client configuration. This label is "Unnamed" by default but could...

Linux kernel 安全漏洞

Linux kernel is the kernel used by Linux, the open source operating system of the Linux Foundation in the United States. The Linux kernel suffers from a security vulnerability that stems from not issuing an IBPB immediately during a system call...

UBUNTU-CVE-2023-0045

The current implementation of the prctl syscall does not issue an IBPB immediately during the syscall. The ibprctlset function updates the Thread Information Flags TIFs for the task and updates the SPECCTRL MSR on the function speculationctrlupdate, but the IBPB is only issued on the next...

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

An update for kernel is now available for Red Hat Enterprise Linux 8.6 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...

RHEL 8 : kpatch-patch (RHSA-2020:3297)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:3297 advisory. This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel...

RHEL 8 : kpatch-patch (RHSA-2020:3073)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:3073 advisory. This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel...

Linux kernel 安全漏洞

The Linux kernel is the kernel used by the Linux Foundation's open source operating system Linux. The Linux kernel suffers from a security vulnerability that stems from nVMX allowing speculative execution attacks where L2 can execute a Spectre v2 attack against L1 because L1 believes it does not...

The vulnerability of the KVM virtualization subsystem in the Linux operating system allows a hacker to gain unauthorized access and increase their privileges.

The vulnerability of the KVM virtualization subsystem in the Linux operating system is related to the execution of the Indirect Branch Prediction Barrier IBPB mechanism on the virtual machine when the guest system uses the Indirect Branch Restricted Speculation IBRS mechanism for indirect branch...

The vulnerability of the Indirect Branch Prediction Barrier (IBPB) implementation in AMD microprogramming software allows a hacker to gain unauthorized access to protected information.

The vulnerability of the Indirect Branch Prediction Barrier IBPB implementation in AMD microprocessors is related to improper cleaning of the RAS stack. Exploiting this vulnerability can allow an attacker to gain unauthorized access to protected information through a secondary channel...