What’s Vulnerable › Vulnerabilities

CVE-2020-25743

• 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

hw/ide/pci.c in QEMU before 5.1.1 can trigger a NULL pointer dereference because it lacks a pointer check before an ide_cancel_dma_sync call.

Affected products

• QEMU: before 5.1.1 — fixed in 5.1.1
• Red Hat Enterprise Linux: 7.0, 8.0
• nova_libvirt container provided by the Red Hat OpenStack Platform: 13.0

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=1881409
• https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05967.html
• https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Fide_nullptr1b
• http://www.openwall.com/lists/oss-security/2020/09/29/1
• https://bugzilla.redhat.com/show_bug.cgi?id=1881409
• https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05967.html
• https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Fide_nullptr1b

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