SB20260408164 - Red Hat Enterprise Linux 9 update for kernel-rt
Published: April 8, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Improper locking (CVE-ID: CVE-2025-38154)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the sk_psock_backlog() function in net/core/skmsg.c. A local user can perform a denial of service (DoS) attack.
2) Use-after-free (CVE-ID: CVE-2025-38180)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the lec_itf_walk(), lec_seq_start() and lec_seq_stop() functions in net/atm/lec.c. A local user can escalate privileges on the system.
3) Double free (CVE-ID: CVE-2025-38206)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a double free error within the exfat_free_upcase_table() function in fs/exfat/nls.c. A local user can perform a denial of service (DoS) attack.
4) Use-after-free (CVE-ID: CVE-2025-38248)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the br_multicast_port_ctx_init() function in net/bridge/br_multicast.c. A local user can escalate privileges on the system.
5) Use-after-free (CVE-ID: CVE-2026-23209)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the macvlan_common_newlink() function in drivers/net/macvlan.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.