CVE-2023-1998 Spectre v2 SMT mitigations problem in Linux kernel

The Linux kernel allows userspace processes to enable mitigations by calling prctl with PRSETSPECULATIONCTRL which disables the speculation feature as well as by using seccomp. We had noticed that on VMs of at least one major cloud provider, the kernel still left the victim process exposed to...

Linux Kernel 6.2 - Userspace Processes To Enable Mitigation

Exploit Title: Linux Kernel 6.2 - Userspace Processes To Enable Mitigation Exploit Author: nu11secur1ty CVE ID: CVE-2023-1998 Description Summary The Linux kernel allows userspace processes to enable mitigations by calling prctl with PRSETSPECULATIONCTRL which disables the speculation feature as...

Linux Kernel 6.2 - Userspace Processes To Enable Mitigation Exploit

Exploit Title: Linux Kernel 6.2 - Userspace Processes To Enable Mitigation Exploit Author: nu11secur1ty CVE ID: CVE-2023-1998 Description Summary The Linux kernel allows userspace processes to enable mitigations by calling prctl with PRSETSPECULATIONCTRL which disables the speculation feature as...

USN-6033-1: Linux kernel (OEM) vulnerabilities

It was discovered that the Traffic-Control Index TCINDEX implementation in the Linux kernel did not properly perform filter deactivation in some situations. A local attacker could possibly use this to gain elevated privileges. Please note that with the fix for this CVE, kernel support for the...

Security Bulletin: IBM has released Unified Extensible Firmware Interface (UEFI) fixes in response to the vulnerability known as Spectre (CVE-2017-5715)

Summary IBM has released the following UEFI fixes for System x, Flex and BladeCenter systems in response to the vulnerability known as Spectre CVE-2017-5715. Vulnerability Details Summary IBM has released the following UEFI fixes for System x, Flex and BladeCenter systems in response to the...

SUSE-SU-2023:1894-1 Security update for the Linux Kernel

The SUSE Linux Enterprise 12 SP5 kernel was updated to receive various security and bugfixes. The following security bugs were fixed: - CVE-2023-1611: Fixed an use-after-free flaw in btrfssearchslot bsc1209687. - CVE-2020-36691: Fixed an issue which could allow attackers to cause a denial of...

SUSE CVE-2023-1998

The Linux kernel allows userspace processes to enable mitigations by calling prctl with PRSETSPECULATIONCTRL which disables the speculation feature as well as by using seccomp. We had noticed that on VMs of at least one major cloud provider, the kernel still left the victim process exposed to...

Missing Linux Kernel mitigations for 'Cross-Thread Return Address Predictions' hardware vulnerability (AMD-SB-1045)

The remote host is missing one or more known mitigations on Linux Kernel side for the referenced SPDX-FileCopyrightText: 2023 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-onl...

CVE-2023-1998

It was found that the Linux Kernel still left the victim process exposed to attacks in some cases even after enabling the spectre-BTI mitigation with prctl. The kernel failed to protect applications that attempted to protect against Spectre v2 leaving them open to attack from other processes...

Oracle Linux 7 / 8 : Unbreakable Enterprise kernel-container (ELSA-2023-12256)

The remote Oracle Linux 7 / 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2023-12256 advisory. - Documentation/hw-vuln: Add documentation for Cross-Thread Return Predictions Tom Lendacky Orabug: 35166671 CVE-2022-27672 - KVM: x86: Mitigate t...

Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2023-12255)

The remote Oracle Linux 7 / 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2023-12255 advisory. - Documentation/hw-vuln: Add documentation for Cross-Thread Return Predictions Tom Lendacky Orabug: 35166671 CVE-2022-27672 - KVM: x86: Mitigate t...

Ubuntu: Security Advisory (USN-6013-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2023 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

CVE-2023-1998

The Linux kernel allows userspace processes to enable mitigations by calling prctl with PRSETSPECULATIONCTRL which disables the speculation feature as well as by using seccomp. We had noticed that on VMs of at least one major cloud provider, the kernel still left the victim process exposed to...

UBUNTU-CVE-2023-1998

The Linux kernel allows userspace processes to enable mitigations by calling prctl with PRSETSPECULATIONCTRL which disables the speculation feature as well as by using seccomp. We had noticed that on VMs of at least one major cloud provider, the kernel still left the victim process exposed to...

Ubuntu: Security Advisory (USN-6014-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2023 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

USN-6014-1: Linux kernel vulnerabilities

Xuewei Feng, Chuanpu Fu, Qi Li, Kun Sun, and Ke Xu discovered that the TCP implementation in the Linux kernel did not properly handle IPID assignment. A remote attacker could use this to cause a denial of service connection termination or inject forged data. CVE-2020-36516 Ke Sun, Alyssa Milburn,...

USN-6014-1 linux, linux-kvm, linux-lts-xenial vulnerabilities

Xuewei Feng, Chuanpu Fu, Qi Li, Kun Sun, and Ke Xu discovered that the TCP implementation in the Linux kernel did not properly handle IPID assignment. A remote attacker could use this to cause a denial of service connection termination or inject forged data. CVE-2020-36516 Ke Sun, Alyssa Milburn,...

USN-6013-1: Linux kernel (AWS) vulnerabilities

Xuewei Feng, Chuanpu Fu, Qi Li, Kun Sun, and Ke Xu discovered that the TCP implementation in the Linux kernel did not properly handle IPID assignment. A remote attacker could use this to cause a denial of service connection termination or inject forged data. CVE-2020-36516 Ke Sun, Alyssa Milburn,...

USN-6013-1 linux-aws vulnerabilities

Xuewei Feng, Chuanpu Fu, Qi Li, Kun Sun, and Ke Xu discovered that the TCP implementation in the Linux kernel did not properly handle IPID assignment. A remote attacker could use this to cause a denial of service connection termination or inject forged data. CVE-2020-36516 Ke Sun, Alyssa Milburn,...

Ubuntu 22.04 LTS : Linux kernel (Intel IoTG) vulnerabilities (USN-6004-1)

The remote Ubuntu 22.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6004-1 advisory. It was discovered that the KVM VMX implementation in the Linux kernel did not properly handle indirect branch prediction isolation between L1 and L2 VMs...