PT-2026-43757 · Linux+1 · Linux Kernel+1
CVE-2026-45890
·
Published
2026-05-27
·
Updated
2026-07-31
CVSS v4.0
6.8
Medium
| Vector | AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
A flaw in the xen-netback component allows a malicious or buggy Xen guest to cause a guest-to-host denial of service on systems where
panic on warn is set to 1. The issue occurs because the connect() function in the backend fails to validate if the value written to the xenbus key multi-queue-num-queues is zero, checking only the upper bound against xenvif max queues. When requested num queues is 0, it reaches the vzalloc() function, which triggers a WARN ON ONCE(!size) in vmalloc node range(). This contradicts the Xen network interface specification, which requires the queue count to be greater than zero.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
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Related Identifiers
Affected Products
Linuxmint
Linux Kernel