SB20260420135 - Red Hat Enterprise Linux 9 update for kernel
Published: April 20, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 secuirty vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2026-23066)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the rxrpc_recvmsg() function in net/rxrpc/recvmsg.c. A local user can escalate privileges on the system.
2) Use-after-free (CVE-ID: CVE-2026-23111)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the nft_map_catchall_activate() function in net/netfilter/nf_tables_api.c. A local user can escalate privileges on the system.
3) Memory leak (CVE-ID: CVE-2026-23144)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to memory leak within the damon_sysfs_context_add_dirs() function in mm/damon/sysfs.c. A local user can perform a denial of service (DoS) attack.
4) Use-after-free (CVE-ID: CVE-2026-23171)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the bond_enslave() function in drivers/net/bonding/bond_main.c. A local user can escalate privileges on the system.
5) Use-after-free (CVE-ID: CVE-2026-23193)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the iscsit_dec_session_usage_count() function in drivers/target/iscsi/iscsi_target_util.c. A local user can escalate privileges on the system.
6) Out-of-bounds read (CVE-ID: CVE-2026-23204)
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 u32_classify() function in net/sched/cls_u32.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.