Red Hat alert RHSA-2025:15035-01 (kernel)

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.

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

Security Fix(es):

* kernel: padata: fix UAF in padata_reorder (CVE-2025-21727)

* kernel: can: peak_usb: fix use after free bugs (CVE-2021-47670)

* kernel: net_sched: hfsc: Fix a UAF vulnerability in class with netem as
child qdisc (CVE-2025-37890)

* kernel: net_sched: hfsc: Address reentrant enqueue adding class to eltree
twice (CVE-2025-38001)

* kernel: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue()
(CVE-2025-38000)

* kernel: crypto: algif_hash - fix double free in hash_accept
(CVE-2025-38079)

* kernel: ftrace: Fix NULL pointer dereference in is_ftrace_trampoline when
ftrace is dead (CVE-2022-49977)

* kernel: sch_hfsc: make hfsc_qlen_notify() idempotent (CVE-2025-38177)

* kernel: Bluetooth: hci_core: Fix use-after-free in vhci_flush()
(CVE-2025-38250)

* kernel: net/sched: Always pass notifications when child class becomes empty
(CVE-2025-38350)

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.

This content is licensed under the Creative Commons Attribution 4.0
International License (https://creativecommons.org/licenses/by/4.0/). If you
distribute this content, or a modified version of it, you must provide
attribution to Red Hat Inc. and provide a link to the original.

Original: https://access.redhat.com/security/data/csaf/v2/advisories/2025/rhsa-2025_15035.json