What’s Vulnerable › Vulnerabilities

CVE-2020-25742

• Severity: low (CVSS 3.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-06 · updated 2026-06-17
• Weakness: CWE-476

Description

pci_change_irq_level in hw/pci/pci.c in QEMU before 5.1.1 has a NULL pointer dereference because pci_get_bus() might not return a valid pointer.

Affected products

• QEMU: before 5.1.1 — fixed in 5.1.1

How to fix

Upgrade to a fixed version: QEMU 5.1.1. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2020/09/29/1
• https://bugzilla.redhat.com/show_bug.cgi?id=1883178
• https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05294.html
• https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Flsi_nullptr1
• http://www.openwall.com/lists/oss-security/2020/09/29/1
• https://bugzilla.redhat.com/show_bug.cgi?id=1883178
• https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05294.html
• https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Flsi_nullptr1

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