SB2021051236 - SUSE update for the Linux Kernel
Published: May 12, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 secuirty vulnerabilities.
1) Infinite loop (CVE-ID: CVE-2020-36310)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to infinite loop in set_memory_region_test in arch/x86/kvm/svm/svm.c. A local user can consume all available system resources and cause denial of service conditions.
2) Memory leak (CVE-ID: CVE-2020-36312)
The vulnerability allows a local user to perform DoS attack on the target system.
The vulnerability exists in the KVM hypervisor of the Linux kernel. A local user can force the application to leak memory and perform denial of service attack.
3) Improper Resource Shutdown or Release (CVE-ID: CVE-2020-36322)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists in the FUSE filesystem implementation in the Linux kernel due to fuse_do_getattr() calls make_bad_inode() in inappropriate situations. A local user can run a specially crafted program to trigger kernel crash.
Note, the vulnerability exists due to incomplete fix for #VU58207 (CVE-2021-28950).
4) Excessive Iteration (CVE-ID: CVE-2021-28950)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to excessive iteration in fs/fuse/fuse_i.h in the Linux kernel. A local user can run a specially crafted program to perform a denial of service attack.
5) Out-of-bounds read (CVE-ID: CVE-2021-29155)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists in retrieve_ptr_limit in kernel/bpf/verifier.c in the Linux kernel mechanism. A local, special user privileged (CAP_SYS_ADMIN) BPF program running on affected systems may bypass the protection, and execute speculatively out-of-bounds loads from the kernel memory.
6) Buffer overflow (CVE-ID: CVE-2021-29650)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error within the netfilter subsystem in net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h. A local user can trigger memory corruption upon the assignment of a new table value and cause denial of service.
7) Out-of-bounds read (CVE-ID: CVE-2021-3444)
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to an out-of-bounds read error within the fixup_bpf_calls() function in kernel/bpf/verifier.c. A local user can execute arbitrary code.
Remediation
Install update from vendor's website.