Поиск уязвимостей

An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are processing watch events using a single thread. If the events are received faster than the thread is able to handle, they will get queued. As the queue is unbounded, a guest may be able to trigger an OOM in the backend. All systems with a FreeBSD, Linux, or NetBSD (any version) dom0 are vulnerable.

An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.

Уязвимость ядра операционной системы Linux, позволяющая нарушителю повысить свои привилегии или получить несанкционированный доступ к защищаемой информации

Security update for the Linux Kernel

ALT-PU-2020-3262: package `kernel-image-mp` update to version 5.9.8-alt1

ALT-PU-2020-3224: package `kernel-image-std-def` update to version 5.4.75-alt1

ALT-PU-2020-3223: package `kernel-image-un-def` update to version 5.9.6-alt1

ELSA-2020-5996: Unbreakable Enterprise kernel security update (IMPORTANT)

ELSA-2020-5995: Unbreakable Enterprise kernel security update (IMPORTANT)

Security update for the Linux Kernel (Live Patch 21 for SLE 15 SP1)

ALT-PU-2021-1009: package `kernel-image-std-def` update to version 5.4.87-alt1

Security update for the Linux Kernel

ALT-PU-2020-3428: package `kernel-image-rt` update to version 4.19.160-alt1.rt69

ALT-PU-2021-1862: package `kernel-image-rpi-def` update to version 5.10.36-alt1

Security update for the Linux Kernel

Security update for the Linux Kernel (Live Patch 9 for SLE 15 SP2)

ALT-PU-2021-1093: package `kernel-image-rpi-def` update to version 5.4.83-alt1

ELSA-2021-9030: Unbreakable Enterprise kernel security update (IMPORTANT)

Security update for the Linux Kernel

ALT-PU-2021-1141: package `kernel-image-rt` update to version 4.19.165-alt1.rt70