CVE-2023-52993

MEDIUM EPSS 15.9%
Published Mar 27, 20251y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Mar 27, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
15.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥2.6.18  –  <4.14.305
linuxlinux_kernel*≥4.15  –  <4.19.272
linuxlinux_kernel*≥4.20  –  <5.4.231
linuxlinux_kernel*≥5.5  –  <5.10.166
linuxlinux_kernel*≥5.11  –  <5.15.91
linuxlinux_kernel*≥5.16  –  <6.1.9
linuxlinux_kernel6.2any
linuxlinux_kernel6.2any
linuxlinux_kernel6.2any
linuxlinux_kernel6.2any
linuxlinux_kernel6.2any

References 7

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

Remediation

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