SB2020073027 - Red Hat Enterprise Linux 7 update for kernel
Published: July 30, 2020
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) Resource management error (CVE-ID: CVE-2019-11487)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a reference count overflow in page->_refcount that leads to a use-after-free error on systems with more than 140 GiB of RAM. A local user can send specially crafted FUSE requests that may lead to denial of service conditions.
The vulnerability is related to code in fs/fuse/dev.c, fs/pipe.c, fs/splice.c, include/linux/mm.h, include/linux/pipe_fs_i.h, kernel/trace/trace.c, mm/gup.c, and mm/hugetlb.c files.
2) Improper Handling of Exceptional Conditions (CVE-ID: CVE-2020-12888)
The vulnerability allows a local user to perform a deinal of service (DoS) attack.
The vulnerability exists due to the VFIO PCI driver mishandles attempts to access disabled memory space. A local user can cause a denial of service condition on the target system.
3) Out-of-bounds Write (CVE-ID: CVE-2020-10713)
The vulnerability allows a local attacker to compromise vulnerable system.
The vulnerability exists due to a "BootHole" issue. An attacker with physical access can install persistent and stealthy bootkits or malicious bootloaders, trigger out-of-bounds write and execute arbitrary code on the target system.
Remediation
Install update from vendor's website.