SB2026012128 - Red Hat Enterprise Linux 9 update for kernel
Published: January 21, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Out-of-bounds read (CVE-ID: CVE-2025-21724)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to an out-of-bounds read error within the iova_bitmap_offset_to_index() function in drivers/vfio/iova_bitmap.c. A local user can perform a denial of service (DoS) attack.
2) Memory leak (CVE-ID: CVE-2025-37849)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to memory leak within the kvm_arch_vcpu_create() function in arch/arm64/kvm/arm.c. A local user can perform a denial of service (DoS) attack.
3) Buffer overflow (CVE-ID: CVE-2025-37891)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to memory corruption within the include/sound/ump_convert.h. A local user can escalate privileges on the system.
4) Out-of-bounds read (CVE-ID: CVE-2025-40154)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to an out-of-bounds read error within the log_quirks() function in sound/soc/intel/boards/bytcr_rt5640.c. A local user can perform a denial of service (DoS) attack.
5) Out-of-bounds read (CVE-ID: CVE-2025-40277)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to an out-of-bounds read error within the vmw_cmd_check() function in drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.