Описание
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.
Ссылки
- Mailing ListThird Party Advisory
- Mailing ListThird Party Advisory
- Third Party Advisory
- Third Party Advisory
- Third Party Advisory
- PatchVendor Advisory
- Mailing ListThird Party Advisory
- Mailing ListThird Party Advisory
- Third Party Advisory
- Third Party Advisory
- Third Party Advisory
- PatchVendor Advisory
Уязвимые конфигурации
Одно из
Одновременно
Одно из
Одно из
EPSS
8.8 High
CVSS3
7.2 High
CVSS2
Дефекты
Связанные уязвимости
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.
An issue was discovered in the Linux kernel through 5.10.1, as used wi ...
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
EPSS
8.8 High
CVSS3
7.2 High
CVSS2