CVE-2026-45890

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-05-27. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 5 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 25, 2026

Advisory Details (8)

Auto-updated Jun 25, 2026
No patch confirmed yet.
generic

xen-netback: reject zero-queue configuration from guest - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ec4859ac5c933e3315543a61adc1ca4358006a41
generic

xen-netback: reject zero-queue configuration from guest - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d99f69ddc70fd9f4b8148add62209a1a8eb5c615
generic

xen-netback: reject zero-queue configuration from guest - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ce66d6786de45b7ed9cbbdc0988054bf09e58f54
generic

xen-netback: reject zero-queue configuration from guest - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/88b0fced1bbbfdb356a007592604008ffc93a6a1
generic

xen-netback: reject zero-queue configuration from guest - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/787bfa423228c4b02ba3368128f625d579085353
generic

xen-netback: reject zero-queue configuration from guest - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6d1dc8014334c7fb25719999bca84d811e60a559
generic

xen-netback: reject zero-queue configuration from guest - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/654780dee9eae419e1648ea58462c4efe54518fa
generic

xen-netback: reject zero-queue configuration from guest - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2993e0f904c45f8af12917344bb1cac7ccd05a60

Vendor Advisories for CVE-2026-45890(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(25)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-6.8 (6.8.0-134.134) @ noble2026-09-14ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1057.58~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-09-14ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-09-14ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-09-14ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-09-14ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-09-14ubuntu
ubuntulinux-tools-ibm-edge (5.15.0.1106.110~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-09-14ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-09-14ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-09-14ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1112.122~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-09-14ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-09-14ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-09-14ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-09-14ubuntu
linuxKernel @ 5.10.252—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (53 versions)5.10.257-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.18~rc7-1~exp1 (103 versions)6.18.14-1—

All Vendor Advisories

(24)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 39× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 209 total refreshes for this CVE.

  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-14 09:08 UTCEG score recompute
  3. 2026-09-14 09:08 UTCVendor advisory
  4. 2026-09-14 09:08 UTCGHSA enrichment
  5. 2026-09-13 16:47 UTCEPSS rescore
  6. 2026-09-13 04:09 UTCOSV refresh
  7. 2026-09-12 15:01 UTCEPSS rescore
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-11 09:37 UTCEPSS rescore
  10. 2026-09-10 09:34 UTCEPSS rescore
  11. 2026-09-08 22:00 UTCEPSS rescore
  12. 2026-09-07 16:01 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-04 05:06 UTCEPSS rescore
  15. 2026-09-01 13:54 UTCEPSS rescore
  16. 2026-08-30 19:17 UTCEPSS rescore
  17. 2026-08-30 01:22 UTCEPSS rescore
  18. 2026-08-28 21:41 UTCEPSS rescore
  19. 2026-08-27 14:25 UTCEPSS rescore
  20. 2026-08-26 14:46 UTCEPSS rescore
  21. 2026-08-25 13:49 UTCEPSS rescore
  22. 2026-08-25 05:47 UTCEG score recompute
  23. 2026-08-25 05:47 UTCVendor advisory
  24. 2026-08-25 05:47 UTCGHSA enrichment
  25. 2026-08-23 15:35 UTCEG score recompute
Show 75 more
  1. 2026-08-23 15:35 UTCVendor advisory
  2. 2026-08-23 15:34 UTCGHSA enrichment
  3. 2026-08-23 00:19 UTCEPSS rescore
  4. 2026-08-21 23:49 UTCEPSS rescore
  5. 2026-08-21 20:53 UTCEG score recompute
  6. 2026-08-21 20:53 UTCVendor advisory
  7. 2026-08-21 20:53 UTCGHSA enrichment
  8. 2026-08-20 22:55 UTCEPSS rescore
  9. 2026-08-20 17:43 UTCEG score recompute
  10. 2026-08-20 17:43 UTCVendor advisory
  11. 2026-08-20 17:42 UTCGHSA enrichment
  12. 2026-08-19 17:04 UTCEPSS rescore
  13. 2026-08-18 13:48 UTCEPSS rescore
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 09:21 UTCEG score recompute
  16. 2026-08-17 09:21 UTCVendor advisory
  17. 2026-08-17 09:21 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 02:55 UTCEG score recompute
  20. 2026-08-16 02:55 UTCVendor advisory
  21. 2026-08-16 02:55 UTCGHSA enrichment
  22. 2026-08-16 02:14 UTCEPSS rescore
  23. 2026-08-15 03:20 UTCEG score recompute
  24. 2026-08-15 03:20 UTCVendor advisory
  25. 2026-08-15 03:20 UTCGHSA enrichment
  26. 2026-08-15 01:30 UTCEPSS rescore
  27. 2026-08-14 05:41 UTCEG score recompute
  28. 2026-08-14 05:41 UTCVendor advisory
  29. 2026-08-14 05:41 UTCGHSA enrichment
  30. 2026-08-13 22:00 UTCEPSS rescore
  31. 2026-08-13 08:03 UTCEG score recompute
  32. 2026-08-13 08:03 UTCVendor advisory
  33. 2026-08-13 08:03 UTCGHSA enrichment
  34. 2026-08-12 13:51 UTCEPSS rescore
  35. 2026-08-12 09:36 UTCEG score recompute
  36. 2026-08-12 09:36 UTCVendor advisory
  37. 2026-08-12 09:36 UTCGHSA enrichment
  38. 2026-08-11 07:15 UTCEG score recompute
  39. 2026-08-11 07:15 UTCVendor advisory
  40. 2026-08-11 07:15 UTCGHSA enrichment
  41. 2026-08-11 00:00 UTCEPSS rescore
  42. 2026-08-10 09:36 UTCEG score recompute
  43. 2026-08-10 09:36 UTCVendor advisory
  44. 2026-08-10 09:36 UTCGHSA enrichment
  45. 2026-08-09 13:46 UTCEPSS rescore
  46. 2026-08-09 11:58 UTCEG score recompute
  47. 2026-08-09 11:58 UTCVendor advisory
  48. 2026-08-09 11:58 UTCGHSA enrichment
  49. 2026-08-08 16:37 UTCEPSS rescore
  50. 2026-08-08 13:52 UTCEG score recompute
  51. 2026-08-08 13:52 UTCVendor advisory
  52. 2026-08-08 13:52 UTCGHSA enrichment
  53. 2026-08-07 16:13 UTCVendor advisory
  54. 2026-08-07 16:12 UTCGHSA enrichment
  55. 2026-08-06 18:34 UTCEG score recompute
  56. 2026-08-06 18:34 UTCVendor advisory
  57. 2026-08-06 18:34 UTCGHSA enrichment
  58. 2026-08-06 13:47 UTCEPSS rescore
  59. 2026-08-05 20:56 UTCEG score recompute
  60. 2026-08-05 20:56 UTCVendor advisory
  61. 2026-08-05 20:56 UTCGHSA enrichment
  62. 2026-08-05 19:17 UTCEPSS rescore
  63. 2026-08-04 15:10 UTCEPSS rescore
  64. 2026-08-04 10:39 UTCEPSS rescore
  65. 2026-08-03 16:30 UTCEG score recompute
  66. 2026-08-03 16:30 UTCVendor advisory
  67. 2026-08-03 16:30 UTCGHSA enrichment
  68. 2026-08-03 10:36 UTCEPSS rescore
  69. 2026-08-02 13:23 UTCEG score recompute
  70. 2026-08-02 13:23 UTCVendor advisory
  71. 2026-08-02 13:23 UTCGHSA enrichment
  72. 2026-08-02 02:27 UTCEPSS rescore
  73. 2026-08-01 15:45 UTCEG score recompute
  74. 2026-08-01 15:45 UTCVendor advisory
  75. 2026-08-01 15:45 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-45890?
CVE-2026-45890 is a medium vulnerability published on May 27, 2026. 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…
When was CVE-2026-45890 disclosed?
CVE-2026-45890 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45890 actively exploited?
CVE-2026-45890 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.6% of all scored CVEs.
What is the CVSS score of CVE-2026-45890?
CVE-2026-45890 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-45890?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45890, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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