UBUNTU-CVE-2023-34322

For migration as well as to work around kernels unaware of L1TF see XSA-273, PV guests may be run in shadow paging mode. Since Xen itself needs to be mapped when PV guests run, Xen and shadowed PV guests run directly the respective shadow page tables. For 64-bit PV guests this means running on th...

Type confusion

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-2023-34322 top-level shadow reference dropped too early for 64-bit PV guests

For migration as well as to work around kernels unaware of L1TF see XSA-273, PV guests may be run in shadow paging mode. Since Xen itself needs to be mapped when PV guests run, Xen and shadowed PV guests run directly the respective shadow page tables. For 64-bit PV guests this means running on th...

CVE-2023-34322 top-level shadow reference dropped too early for 64-bit PV guests

For migration as well as to work around kernels unaware of L1TF see XSA-273, PV guests may be run in shadow paging mode. Since Xen itself needs to be mapped when PV guests run, Xen and shadowed PV guests run directly the respective shadow page tables. For 64-bit PV guests this means running on th...

CVE-2023-34322

For migration as well as to work around kernels unaware of L1TF see XSA-273, PV guests may be run in shadow paging mode. Since Xen itself needs to be mapped when PV guests run, Xen and shadowed PV guests run directly the respective shadow page tables. For 64-bit PV guests this means running on th...

Security Bulletin: Multiple vulnerabilities in cURL libcurl affect AIX

Summary Multiple vulnerabilities in cURL libcurl affect AIX. AIX uses cURL libcurl as part of LV/PV encryption integration with HPCS and in Live Update for interacting with HMC. Vulnerability Details CVEID:CVE-2023-38546 DESCRIPTION: cURL libcurl could allow a remote attacker to bypass security...

Denial Of Service (DoS)

xen is vulnerable to Denial Of Service DoS. The vulnerability exists because a PV vCPU can place a breakpoint over the live GDT. This allows the PV vCPU to exploit and lock up the CPU entirely...

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...

SUSE SLED15 / SLES15 / openSUSE 15 Security Update : xen (SUSE-SU-2023:4476-1)

The remote openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2023:4476-1 advisory. - A division-by-zero error on some AMD processors can potentially return speculative data resulting in loss of confidentiality. CVE-2023-20588 - arm3...

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...

pv-doktor.de Improper Access Control vulnerability OBB-3777092

Following the coordinated and responsible vulnerability disclosure guidelines of the ISO 29147 standard, Open Bug Bounty has: a. verified the vulnerability and confirmed its existence; b. notified the website operator about its existence. Technical details of the vulnerability are currently hidde...

kernel: acpi: Fix suspend with Xen PV

In the Linux kernel, the following vulnerability has been resolved: acpi: Fix suspend with Xen PV Commit f1e525009493 "x86/boot: Skip realmode init code when running as Xen PV guest" missed one code path accessing realmodeheader, leading to dereferencing NULL when suspending the system under Xen:...

Fedora 39 : xen (2023-de338d9f37)

The remote Fedora 39 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-de338d9f37 advisory. xenstored: A transaction conflict can crash C Xenstored XSA-440, CVE-2023-34323 x86/AMD: missing IOMMU TLB flushing XSA-442, CVE-2023-34326 Multiple...

Fedora 37 : xen (2023-881672fdab)

The remote Fedora 37 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-881672fdab advisory. xenstored: A transaction conflict can crash C Xenstored XSA-440, CVE-2023-34323 x86/AMD: missing IOMMU TLB flushing XSA-442, CVE-2023-34326 Multiple...

SUSE SLES15: xen / xen-devel / xen-libs / xen-tools / xen-tools-domU / etc (SUSE-SU-2023:4183-1)

The remote SUSE Linux SLES15 / SLESSAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2023:4183-1 advisory. - CVE-2023-34323: Fixed a potential crash in C Xenstored due to an incorrect assertion XSA-440 bsc1215744. - CVE-2023-34326: Fixed ...

Fedora 37 : xen (2023-948136565a)

The remote Fedora 37 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-948136565a advisory. arm32: The cache may not be properly cleaned/invalidated XSA-437, CVE-2023-34321 top-level shadow reference dropped too early for 64-bit PV guests...

Xen: x86/AMD: Debug Mask handling (XSA-444)

AMD CPUs since 2014 have extensions to normal x86 debugging functionality. Xen supports guests using these extensions. Unfortunately there are errors in Xen's handling of the guest state, leading to denials of service. - CVE-2023-34327 - An HVM vCPU can end up operating in the context of a previo...

x86/AMD: Debug Mask handling

ISSUE DESCRIPTION AMD CPUs since 2014 have extensions to normal x86 debugging functionality. Xen supports guests using these extensions. Unfortunately there are errors in Xen's handling of the guest state, leading to denials of service. 1 CVE-2023-34327 - An HVM vCPU can end up operating in the...