Astra Linux – Vulnerabilities in Linux, Linux-5.10, Linux-5.15, Linux-6.1

In the Linux kernel, the following vulnerability has been resolved: soc: qcom: cmd-db: Maps shared memory as WC, not WB. Linux does not write to the cmd-db region. This memory region is protected from writing by XPU. XPU may sometimes falsely detect a clean cache eviction as a “write” to the...

Astra Linux – Vulnerability in Linux 5.10, Linux

In the Linux kernel, the following vulnerability has been resolved: xen/netfront: Destroy queues before realnumtxqueues is zeroed xennetDestroyQueues relies on info-netdev-realnumtxqueues to delete queues. Since d7dac083414eb5bb99a6d2ed53dc2c1b405224e5 “net-sysfs: Update the queue counts in the...

Astra Linux – Vulnerability in Linux

A issue was discovered in Xen through version 4.14.x. Some operating systems, such as Linux, FreeBSD, and NetBSD, process watch events using a single thread. If these events are received faster than the thread can handle them, they will be queued up. Since the queue is unbounded, a guest system m...

Astra Linux – Vulnerability in Xen

A issue was discovered in Xen through version 4.11.x, allowing users of x86 Intel HVM guest operating systems to obtain unintended read/write DMA access. This could potentially lead to a denial of service causing the host operating system to crash or result in privilege escalation. This issue...

Astra Linux – Vulnerabilities in Linux, Linux-5.10, Linux-5.15, Linux-6.1

Transmitted requests in Xen’s virtual network protocol can consist of multiple parts. Although none of them are actually useful, except for the initial part, any of these parts can be of zero length, meaning they carry no data at all. Apart from the certain initial portion of the data to be...

Astra Linux - Vulnerability in Linux

A vulnerability was discovered in the Linux kernel versions 3.2 through 5.10.16, as used by Xen. Grant mapping operations often occur in batch hypercalls, where multiple operations are performed in a single hypercall; the success or failure of each operation is reported to the backend driver, whi...

Astra Linux – Vulnerability found in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: xen/privcmd: fixed the error exit of privcmdioctldmop The error exit of privcmdioctldmop calls unlockpages, potentially with pages being NULL, leading to a NULL dereference. Additionally, lockpages does not check whether...

Astra Linux – Vulnerability in Linux

A issue was discovered in the Linux kernel versions 2.6.39 through 5.10.16, as used in Xen. The block, net, and SCSI backends consider certain errors as ordinary bugs, which are deliberately designed to cause kernel crashes. For errors that may be influenced by guests such as memory exhaustion...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: x86/xen: Do not perform the PV iret hypercall through the hypercall page. Instead of jumping to the Xen hypercall page to execute the iret hypercall, the required sequence is directly coded in the xen-asm.S file. This action is...

Astra Linux – Vulnerability found in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: xen/gntdev: Accommodation for VMA splitting Prior to this commit, the gntdev driver code did not handle the following scenario correctly with paravirtualized PV Xen domains: The user process sets up a gntdev mapping consisting of...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: xen: Speed up grant-table reclaim When a grant entry is still in use by the remote domain, Linux must put it on a deferred list. Normally, this list is very short, because the PV network and block protocols expect the backend to...

Astra Linux – Vulnerability in Linux, Linux 5.10

Rogue backends can cause Denial of Service DoS attacks on guests through high-frequency events. This CNA information record relates to multiple Common Vulnerabilities and Exposures CVEs; the text explains which aspects/vulnerabilities correspond to which CVEs. Xen allows for the execution of PV...

Astra Linux – Vulnerability in Linux

A issue was discovered in the Linux kernel through version 5.9.1, as used with Xen up to version 4.14.x. The file drivers/xen/events/eventsbase.c allows for the removal of event channels during the event-handling loop a race condition. This can lead to a use-after-free or NULL pointer...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: x86/xen: Remove the USERGSSYSRET64 paravirt call. This change is committed as afd30525a659ac0ae0904f0cb4a2ca75522c3123 in the upstream code. USERGSSYSRET64 is used to return from a syscall via SYSRET. However, a Xen PV guest will...

Astra Linux – Vulnerability in Linux

A issue was discovered in the Linux kernel, specifically with versions up to 5.9.1, when used with Xen in versions up to 4.14.x. Users of guest operating systems may experience a denial of service where the host operating system hangs due to a high rate of events affecting dom0, also known as...

Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: xen-netfront: Fixed NULL pointers after live migration. NAPIs are set up for each network interface to poll data for the kernel. The interface with the source host is destroyed during live migration, and a new interface with t...

Astra Linux – Vulnerability in Linux

A issue was discovered in the Linux kernel versions 3.11 through 5.10.16, as used by Xen. When serving requests to the PV backend, the driver maps grant references provided by the frontend. During this process, errors may occur. In one case, an error encountered earlier might be discarded by late...

Astra Linux – Vulnerability in Linux, Linux 5.10

Rogue backends can cause Denial of Service DoS attacks on guests through high-frequency events. This CNA information record relates to multiple Common Vulnerabilities and Exposures CVEs; the text explains which aspects/vulnerabilities correspond to which CVEs. Xen allows for the execution of PV...

Astra Linux – Vulnerability in Linux

A issue was discovered in the Linux kernel through version 5.11.3, when it was used with Xen PV. A certain part of the netback driver lacks proper handling of errors, such as failed memory allocations as a result of changes to the way errors related to grant mapping are handled. A denial-of-servi...

Astra Linux – Vulnerability in Xen

Inappropriate x86 IOMMU timeout detection/handling: IOMMU processes commands that are issued in parallel with the operation of the CPUs that issue those commands. In the current implementation in Xen, asynchronous notifications of the completion of such commands are not used. Instead, the issuing...