0.0
NA
CVE-2023-52993
Linux Kernel x86/i8259 NULL Pointer Dereference Vulnerability
Description

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.

INFO

Published Date :

March 27, 2025, 5:15 p.m.

Last Modified :

March 28, 2025, 6:11 p.m.

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Remotely Exploitable :

No

Impact Score :

Exploitability Score :

Affected Products

The following products are affected by CVE-2023-52993 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2023-52993.

URL Resource
https://git.kernel.org/stable/c/0b08201158f177aab469e356b4d6af24fdd118df
https://git.kernel.org/stable/c/137f1b47da5f58805da42c1b7811e28c1e353f39
https://git.kernel.org/stable/c/496975d1a2937f4baadf3d985991b13fc4fc4f27
https://git.kernel.org/stable/c/5fa55950729d0762a787451dc52862c3f850f859
https://git.kernel.org/stable/c/744fe9be9665227335539b7a77ece8d9ff62b6c0
https://git.kernel.org/stable/c/8770cd9d7c14aa99c255a0d08186f0be953e1638
https://git.kernel.org/stable/c/e284c273dbb4c1ed68d4204bff94d0b10e4a90f5

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2023-52993 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2023-52993 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Mar. 27, 2025

    Action Type Old Value New Value
    Added Description 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.
    Added Reference https://git.kernel.org/stable/c/0b08201158f177aab469e356b4d6af24fdd118df
    Added Reference https://git.kernel.org/stable/c/137f1b47da5f58805da42c1b7811e28c1e353f39
    Added Reference https://git.kernel.org/stable/c/496975d1a2937f4baadf3d985991b13fc4fc4f27
    Added Reference https://git.kernel.org/stable/c/5fa55950729d0762a787451dc52862c3f850f859
    Added Reference https://git.kernel.org/stable/c/744fe9be9665227335539b7a77ece8d9ff62b6c0
    Added Reference https://git.kernel.org/stable/c/8770cd9d7c14aa99c255a0d08186f0be953e1638
    Added Reference https://git.kernel.org/stable/c/e284c273dbb4c1ed68d4204bff94d0b10e4a90f5
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2023-52993 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2023-52993 weaknesses.

NONE - Vulnerability Scoring System
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