xen-netback: reject zero-queue configuration from guest
Summary
| CVE | CVE-2026-45890 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-27 14:17:03 UTC |
| Updated | 2026-05-27 14:48:31 UTC |
| Description | 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. |
Risk And Classification
EPSS: 0.000240000 probability, percentile 0.073770000 (date 2026-05-28)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d 2993e0f904c45f8af12917344bb1cac7ccd05a60 git | Not specified |
| CNA | Linux | Linux | affected 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d 787bfa423228c4b02ba3368128f625d579085353 git | Not specified |
| CNA | Linux | Linux | affected 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d ce66d6786de45b7ed9cbbdc0988054bf09e58f54 git | Not specified |
| CNA | Linux | Linux | affected 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d 88b0fced1bbbfdb356a007592604008ffc93a6a1 git | Not specified |
| CNA | Linux | Linux | affected 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d ec4859ac5c933e3315543a61adc1ca4358006a41 git | Not specified |
| CNA | Linux | Linux | affected 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d 654780dee9eae419e1648ea58462c4efe54518fa git | Not specified |
| CNA | Linux | Linux | affected 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d d99f69ddc70fd9f4b8148add62209a1a8eb5c615 git | Not specified |
| CNA | Linux | Linux | affected 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d 6d1dc8014334c7fb25719999bca84d811e60a559 git | Not specified |
| CNA | Linux | Linux | affected 3.16 | Not specified |
| CNA | Linux | Linux | unaffected 3.16 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.252 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.202 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.165 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.128 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.75 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.14 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.4 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/787bfa423228c4b02ba3368128f625d579085353 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ce66d6786de45b7ed9cbbdc0988054bf09e58f54 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d99f69ddc70fd9f4b8148add62209a1a8eb5c615 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/654780dee9eae419e1648ea58462c4efe54518fa | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/2993e0f904c45f8af12917344bb1cac7ccd05a60 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6d1dc8014334c7fb25719999bca84d811e60a559 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/88b0fced1bbbfdb356a007592604008ffc93a6a1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ec4859ac5c933e3315543a61adc1ca4358006a41 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.