Important: kernel-rt security and bug fix update

2023-04-0400:00:00

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osv.dev

kernel-rt

security update

bug fix

real-time linux

cve-2022-4378

cve-2023-0266

cve-2023-0386

cpu soft lockup

lazy irq_work

almalinux 8.7.z3

7.9 High

CVSS3

Attack Vector

ADJACENT

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:H

7.3 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

41.2%

JSON

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: stack overflow in do_proc_dointvec and proc_skip_spaces (CVE-2022-4378)
ALSA: pcm: Move rwsem lock inside snd_ctl_elem_read to prevent UAF (CVE-2023-0266)
kernel: FUSE filesystem low-privileged user privileges escalation (CVE-2023-0386)
kernel: net: CPU soft lockup in TC mirred egress-to-ingress action (CVE-2022-4269)

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.

Bug Fix(es):

Lazy irq_work does not raise softirq on PREEMPT_RT [almalinux-8] (BZ#2172163)
The latest AlmaLinux 8.7.z3 kernel changes need to be merged into the RT source tree to keep source parity between the two kernels. (BZ#2172278)