RHSA-2025:22914 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: use after free flaw in l2cap_conn_del in net/bluetooth/l2cap_core.c (CVE-2022-3640)
• kernel: sctp: linearize cloned gso packets in sctp_rcv (CVE-2025-38718)
• kernel: Bluetooth: L2CAP: Fix use-after-free (CVE-2023-53305)
• kernel: cifs: fix oops during encryption (CVE-2022-50341)
• kernel: ip6mr: Fix skb_under_panic in ip6mr_cache_report() (CVE-2023-53365)
• kernel: Bluetooth: L2CAP: Fix user-after-free (CVE-2022-50386)
• kernel: wifi: brcmfmac: fix use-after-free bug in brcmf_netdev_start_xmit() (CVE-2022-50408)

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 Real Time for x86_64 - Extended Life Cycle Support 7 x86_64

Fixes

• BZ - 2139610 - CVE-2022-3640 kernel: use after free flaw in l2cap_conn_del in net/bluetooth/l2cap_core.c
• BZ - 2393166 - CVE-2025-38718 kernel: sctp: linearize cloned gso packets in sctp_rcv
• BZ - 2395858 - CVE-2023-53305 kernel: Bluetooth: L2CAP: Fix use-after-free
• BZ - 2395879 - CVE-2022-50341 kernel: cifs: fix oops during encryption
• BZ - 2396130 - CVE-2023-53365 kernel: ip6mr: Fix skb_under_panic in ip6mr_cache_report()
• BZ - 2396431 - CVE-2022-50386 kernel: Bluetooth: L2CAP: Fix user-after-free
• BZ - 2396506 - CVE-2022-50408 kernel: wifi: brcmfmac: fix use-after-free bug in brcmf_netdev_start_xmit()

CVEs

• CVE-2022-3640
• CVE-2022-50341
• CVE-2022-50386
• CVE-2022-50408
• CVE-2023-53305
• CVE-2023-53365
• CVE-2025-38718

References

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