RHSA-2025:15660 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: ext4: use-after-free in ext4_xattr_set_entry() (CVE-2023-2513)
• kernel: ipv6: mcast: extend RCU protection in igmp6_send() (CVE-2025-21759)
• kernel: netfilter: flowtable: fix stuck flows on cleanup due to pending work (CVE-2022-50000)
• kernel: mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race (CVE-2025-38085)
• kernel: wifi: rtw88: fix the 'para' buffer size to avoid reading out of bounds (CVE-2025-38159)
• kernel: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() (CVE-2025-38352)
• kernel: tipc: Fix use-after-free in tipc_conn_close() (CVE-2025-38464)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support Extension 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64

Fixes

• BZ - 2193097 - CVE-2023-2513 kernel: ext4: use-after-free in ext4_xattr_set_entry()
• BZ - 2348596 - CVE-2025-21759 kernel: ipv6: mcast: extend RCU protection in igmp6_send()
• BZ - 2373543 - CVE-2022-50000 kernel: netfilter: flowtable: fix stuck flows on cleanup due to pending work
• BZ - 2375304 - CVE-2025-38085 kernel: mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race
• BZ - 2376064 - CVE-2025-38159 kernel: wifi: rtw88: fix the 'para' buffer size to avoid reading out of bounds
• BZ - 2382581 - CVE-2025-38352 kernel: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()
• BZ - 2383509 - CVE-2025-38464 kernel: tipc: Fix use-after-free in tipc_conn_close()

CVEs

• CVE-2022-50000
• CVE-2023-2513
• CVE-2025-21759
• CVE-2025-38085
• CVE-2025-38159
• CVE-2025-38352
• CVE-2025-38464

References

• https://access.redhat.com/security/updates/classification/#important