CVE-2023-52993 Affecting kernel-64k-debug-modules-extra package, versions *


Severity

Recommended
low

Based on CentOS security rating.

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  • Snyk IDSNYK-CENTOS9-KERNEL64KDEBUGMODULESEXTRA-9545064
  • published28 Mar 2025
  • disclosed27 Mar 2025

Introduced: 27 Mar 2025

NewCVE-2023-52993  (opens in a new tab)

How to fix?

There is no fixed version for Centos:9 kernel-64k-debug-modules-extra.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-64k-debug-modules-extra package and not the kernel-64k-debug-modules-extra package as distributed by Centos. See How to fix? for Centos:9 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL

Baoquan reported that after triggering a crash the subsequent crash-kernel fails to boot about half of the time. It triggers a NULL pointer dereference in the periodic tick code.

This happens because the legacy timer interrupt (IRQ0) is resent in software which happens in soft interrupt (tasklet) context. In this context get_irq_regs() returns NULL which leads to the NULL pointer dereference.

The reason for the resend is a spurious APIC interrupt on the IRQ0 vector which is captured and leads to a resend when the legacy timer interrupt is enabled. This is wrong because the legacy PIC interrupts are level triggered and therefore should never be resent in software, but nothing ever sets the IRQ_LEVEL flag on those interrupts, so the core code does not know about their trigger type.

Ensure that IRQ_LEVEL is set when the legacy PCI interrupts are set up.

CVSS Base Scores

version 3.1