SB20260422240 - Red Hat Enterprise Linux 9 update for kernel

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Main Vulnerability Database SB20260422240

SB20260422240 - Red Hat Enterprise Linux 9 update for kernel

Published: April 22, 2026

Security Bulletin ID SB20260422240
Severity
Low
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 secuirty vulnerabilities.


1) Use-after-free (CVE-ID: CVE-2026-23001)

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_hash_lookup_source(), macvlan_hash_add_source(), macvlan_hash_add(), macvlan_flush_sources(), macvlan_forward_source() and macvlan_fill_info_macaddr() functions in drivers/net/macvlan.c. A local user can escalate privileges on the system.


2) 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.


3) Use-after-free (CVE-ID: CVE-2026-23231)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the nf_tables_addchain() function in net/netfilter/nf_tables_api.c. A local user can escalate privileges on the system.


Remediation

Install update from vendor's website.

References