CVE-2026-45890

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-45890
In the Linux kernel, the following vulnerability has been resolved: xen-netback: reject zero-queue configuration from guest A malicious or buggy Xen guest can write "0" to the xenbus key "multi-queue-num-queues". The connect() function in the backend only validates the upper bound (requested_num_queues > xenvif_max_queues) but not zero, allowing requested_num_queues=0 to reach vzalloc(array_size(0, sizeof(struct xenvif_queue))), which triggers WARN_ON_ONCE(!size) in __vmalloc_node_range(). On systems with panic_on_warn=1, this allows a guest-to-host denial of service. The Xen network interface specification requires the queue count to be "greater than zero". Add a zero check to match the validation already present in xen-blkback, which has included this guard since its multi-queue support was added.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/2993e0f904c45f8af12917344bb1cac7ccd05a60 Patch
https://git.kernel.org/stable/c/654780dee9eae419e1648ea58462c4efe54518fa Patch
https://git.kernel.org/stable/c/6d1dc8014334c7fb25719999bca84d811e60a559 Patch
https://git.kernel.org/stable/c/787bfa423228c4b02ba3368128f625d579085353 Patch
https://git.kernel.org/stable/c/88b0fced1bbbfdb356a007592604008ffc93a6a1 Patch
https://git.kernel.org/stable/c/ce66d6786de45b7ed9cbbdc0988054bf09e58f54 Patch
https://git.kernel.org/stable/c/d99f69ddc70fd9f4b8148add62209a1a8eb5c615 Patch
https://git.kernel.org/stable/c/ec4859ac5c933e3315543a61adc1ca4358006a41 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

25 Jun 2026, 21:13

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CWE NVD-CWE-noinfo
References () https://git.kernel.org/stable/c/2993e0f904c45f8af12917344bb1cac7ccd05a60 - () https://git.kernel.org/stable/c/2993e0f904c45f8af12917344bb1cac7ccd05a60 - Patch
References () https://git.kernel.org/stable/c/654780dee9eae419e1648ea58462c4efe54518fa - () https://git.kernel.org/stable/c/654780dee9eae419e1648ea58462c4efe54518fa - Patch
References () https://git.kernel.org/stable/c/6d1dc8014334c7fb25719999bca84d811e60a559 - () https://git.kernel.org/stable/c/6d1dc8014334c7fb25719999bca84d811e60a559 - Patch
References () https://git.kernel.org/stable/c/787bfa423228c4b02ba3368128f625d579085353 - () https://git.kernel.org/stable/c/787bfa423228c4b02ba3368128f625d579085353 - Patch
References () https://git.kernel.org/stable/c/88b0fced1bbbfdb356a007592604008ffc93a6a1 - () https://git.kernel.org/stable/c/88b0fced1bbbfdb356a007592604008ffc93a6a1 - Patch
References () https://git.kernel.org/stable/c/ce66d6786de45b7ed9cbbdc0988054bf09e58f54 - () https://git.kernel.org/stable/c/ce66d6786de45b7ed9cbbdc0988054bf09e58f54 - Patch
References () https://git.kernel.org/stable/c/d99f69ddc70fd9f4b8148add62209a1a8eb5c615 - () https://git.kernel.org/stable/c/d99f69ddc70fd9f4b8148add62209a1a8eb5c615 - Patch
References () https://git.kernel.org/stable/c/ec4859ac5c933e3315543a61adc1ca4358006a41 - () https://git.kernel.org/stable/c/ec4859ac5c933e3315543a61adc1ca4358006a41 - Patch

27 May 2026, 14:17

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-27 14:17

Updated : 2026-06-25 21:13

NVD link : CVE-2026-45890

Mitre link : CVE-2026-45890

CVE.ORG link : CVE-2026-45890

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo