CVE - CVE-2023-52993

CVE-ID
CVE-2023-52993	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0b08201158f177aab469e356b4d6af24fdd118df URL:https://git.kernel.org/stable/c/0b08201158f177aab469e356b4d6af24fdd118df MISC:https://git.kernel.org/stable/c/137f1b47da5f58805da42c1b7811e28c1e353f39 URL:https://git.kernel.org/stable/c/137f1b47da5f58805da42c1b7811e28c1e353f39 MISC:https://git.kernel.org/stable/c/496975d1a2937f4baadf3d985991b13fc4fc4f27 URL:https://git.kernel.org/stable/c/496975d1a2937f4baadf3d985991b13fc4fc4f27 MISC:https://git.kernel.org/stable/c/5fa55950729d0762a787451dc52862c3f850f859 URL:https://git.kernel.org/stable/c/5fa55950729d0762a787451dc52862c3f850f859 MISC:https://git.kernel.org/stable/c/744fe9be9665227335539b7a77ece8d9ff62b6c0 URL:https://git.kernel.org/stable/c/744fe9be9665227335539b7a77ece8d9ff62b6c0 MISC:https://git.kernel.org/stable/c/8770cd9d7c14aa99c255a0d08186f0be953e1638 URL:https://git.kernel.org/stable/c/8770cd9d7c14aa99c255a0d08186f0be953e1638 MISC:https://git.kernel.org/stable/c/e284c273dbb4c1ed68d4204bff94d0b10e4a90f5 URL:https://git.kernel.org/stable/c/e284c273dbb4c1ed68d4204bff94d0b10e4a90f5
Assigning CNA
kernel.org
Date Record Created
20250327	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250327)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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