CVE-2023-46836

The CVE pertains to Xen virtualization. The issue is a race condition where mitigations for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative Return Stack Overflow) are not IRQ-safe; one entry path remains with interrupts enabled, and combined with the Meltdown XPTI fix (XSA-254) this was ...

CVE-2023-46836

The fixes for XSA-422 Branch Type Confusion and XSA-434 Speculative Return Stack Overflow are not IRQ-safe. It was believed that the mitigations always operated in contexts with IRQs disabled. However, the original XSA-254 fix for Meltdown XPTI deliberately left interrupts enabled on two entry...

CVE-2023-46836 x86: BTC/SRSO fixes not fully effective

The fixes for XSA-422 Branch Type Confusion and XSA-434 Speculative Return Stack Overflow are not IRQ-safe. It was believed that the mitigations always operated in contexts with IRQs disabled. However, the original XSA-254 fix for Meltdown XPTI deliberately left interrupts enabled on two entry...

CVE-2023-46836 x86: BTC/SRSO fixes not fully effective

The fixes for XSA-422 Branch Type Confusion and XSA-434 Speculative Return Stack Overflow are not IRQ-safe. It was believed that the mitigations always operated in contexts with IRQs disabled. However, the original XSA-254 fix for Meltdown XPTI deliberately left interrupts enabled on two entry...

Race Condition

Xen is vulnerable to Race Condition. The vulnerability is caused due to the two mitigations XSA-422 Branch Type Confusion and XSA-434 Speculative Return Stack Overflow not active because it was believed that the mitigations always operated in contexts with IRQs disabled due to original XSA-254 fi...

Xen: x86: BTC/SRSO Fixes Not Fully Effective (XSA-446)

The fixes for XSA-422 Branch Type Confusion and XSA-434 Speculative Return Stack Overflow are not IRQ-safe as it was believed that the mitigations were always operated in contexts with IRQs disabled. However due to an unanticipated interaction with XSA-254 Meltdown, a race condition exists whereb...

x86: BTC/SRSO fixes not fully effective

ISSUE DESCRIPTION The fixes for XSA-422 Branch Type Confusion and XSA-434 Speculative Return Stack Overflow are not IRQ-safe. It was believed that the mitigations always operated in contexts with IRQs disabled. However, the original XSA-254 fix for Meltdown XPTI deliberately left interrupts enabl...

Unbreakable Enterprise kernel security update

5.4.17-2136.323.8 - vhost-scsi: Fix alignment handling with windows Mike Christie Orabug: 35769318 - Revert 'vhost/scsi: support non zerocopy iovecs' Rajan Shanmugavelu Orabug: 35769318 5.4.17-2136.323.7 - x86: change default to specstorebypassdisable=prctl spectrev2user=prctl Andrea Arcangeli...

Fedora: Security Advisory for spectre-meltdown-checker (FEDORA-2023-7228464f28)

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...

Fedora 38 : spectre-meltdown-checker (2023-7228464f28)

The remote Fedora 38 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2023-7228464f28 advisory. This release mainly focuses on the detection of the new Zenbleed CVE-2023-20593 vulnerability, among few other changes that were in line waiting for a releas...

Fedora 36 : xen (2023-04b5338dd0)

The remote Fedora 36 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-04b5338dd0 advisory. 3 security issues 2180425 x86 shadow plus log-dirty mode use-after-free XSA-427, CVE-2022-42332 x86/HVM pinned cache attributes mis-handling XSA-428...

Fedora 37 : xen (2023-da8315e641)

The remote Fedora 37 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-da8315e641 advisory. 3 security issues 2180425 x86 shadow plus log-dirty mode use-after-free XSA-427, CVE-2022-42332 x86/HVM pinned cache attributes mis-handling XSA-428...

CVE-2022-42331

x86: speculative vulnerability in 32bit SYSCALL path Due to an oversight in the very original Spectre/Meltdown security work XSA-254, one entrypath performs its speculation-safety actions too late. In some configurations, there is an unprotected RET instruction which can be attacked with a variet...

CVE-2022-42331

x86: speculative vulnerability in 32bit SYSCALL path Due to an oversight in the very original Spectre/Meltdown security work XSA-254, one entrypath performs its speculation-safety actions too late. In some configurations, there is an unprotected RET instruction which can be attacked with a variet...

Code injection

x86: speculative vulnerability in 32bit SYSCALL path Due to an oversight in the very original Spectre/Meltdown security work XSA-254, one entrypath performs its speculation-safety actions too late. In some configurations, there is an unprotected RET instruction which can be attacked with a variet...

CVE-2022-42331

x86: speculative vulnerability in 32bit SYSCALL path Due to an oversight in the very original Spectre/Meltdown security work XSA-254, one entrypath performs its speculation-safety actions too late. In some configurations, there is an unprotected RET instruction which can be attacked with a variet...

x86: speculative vulnerability in 32bit SYSCALL path

ISSUE DESCRIPTION Due to an oversight in the very original Spectre/Meltdown security work XSA-254, one entrypath performs its speculation-safety actions too late. In some configurations, there is an unprotected RET instruction which can be attacked with a variety of speculative attacks. IMPACT An...

CVE-2022-42331

x86: speculative vulnerability in 32bit SYSCALL path Due to an oversight in the very original Spectre/Meltdown security work XSA-254, one entrypath performs its speculation-safety actions too late. In some configurations, there is an unprotected RET instruction which can be attacked with a variet...

Xen 安全漏洞

Xen is an open source virtual machine monitor product from the University of Cambridge, UK. The product enables different and incompatible operating systems to run on the same computer and supports runtime migration to ensure uptime and avoid downtime. Xen suffers from a security vulnerability th...

CVE-2022-42331

CVE-2022-42331 describes a Xen hypervisor SPECULATIVE execution vulnerability on the x86 32-bit SYSCALL path. Root cause: an oversight in the original Spectre/Meltdown work (XSA-254) leads to an entrypath performing its speculation-safety actions too late, leaving an unprotected RET instruction i...