SB2026081903 - Red Hat Enterprise Linux 9 update for kernel
Published: August 19, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 vulnerabilities.
1) Race condition (CVE-ID: CVE-2026-23110)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition within the scsi_dec_host_busy() function in drivers/scsi/scsi_lib.c. A local user can escalate privileges on the system.
2) Improper input validation (CVE-ID: CVE-2026-31411)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper input validation in sigd_send() when handling sendmsg() input containing a forged vcc pointer. A local user can send a specially crafted message to cause a denial of service.
Exploitation requires control of the ATM signaling daemon role via the ATMSIGD_CTRL ioctl.
3) Out-of-bounds write (CVE-ID: CVE-2026-53016)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in ccp_aes_complete() when processing AF_ALG rfc3686-ctr-aes-ccp requests. A local user can supply a request with an 8-byte IV to cause a denial of service.
4) Out-of-bounds write (CVE-ID: CVE-2026-53059)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in create_log_context() and dm-log bitset handling when processing a crafted device-mapper mirror target configuration with an oversized region count. A local user can create a crafted mirror target to cause a denial of service.
The issue is triggered when region_count overflows 32 bits, causing bitsets to be allocated smaller than required and later accessed with indices derived from the full region space.
Remediation
Install update from vendor's website.