RHSA-2024:1323 - Security Advisory

Topic

An update for kpatch-patch is now available for Red Hat Enterprise Linux 7.

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

This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel.

Security Fix(es):

• kernel: use-after-free in sch_qfq network scheduler (CVE-2023-4921)
• kernel: IGB driver inadequate buffer size for frames larger than MTU (CVE-2023-45871)
• kernel: use-after-free in l2cap_connect and l2cap_le_connect_req in net/bluetooth/l2cap_core.c (CVE-2022-42896)
• kernel: out-of-bounds write in qfq_change_class function (CVE-2023-31436)

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

Affected Products

• Red Hat Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 7 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, little endian 7 ppc64le

Fixes

• BZ - 2147364 - CVE-2022-42896 kernel: use-after-free in l2cap_connect and l2cap_le_connect_req in net/bluetooth/l2cap_core.c
• BZ - 2192671 - CVE-2023-31436 kernel: out-of-bounds write in qfq_change_class function
• BZ - 2244723 - CVE-2023-45871 kernel: IGB driver inadequate buffer size for frames larger than MTU
• BZ - 2245514 - CVE-2023-4921 kernel: use-after-free in sch_qfq network scheduler

CVEs

• CVE-2022-42896
• CVE-2023-4921
• CVE-2023-31436
• CVE-2023-45871

References

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