VulnerabilityPublished 17 Sep 2026Updated 12 Oct 2026

CVE-2026-90082: Linux kernel · net: mana: Cap MSI-X vectors to the device MSI-X table size

Affects Linux kernelSource GCVE Database

Not known to be exploited.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Ubuntu 26.04 LTSlinux`pkg:deb/ubuntu/linux?arch=source&distro=resolute`Other threats	Affected 6.17.0-5.5 – 7.0.0-38.38 23 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-aws`pkg:deb/ubuntu/linux-aws?arch=source&distro=resolute`Other threats	Affected 6.17.0-1002.2 – 7.0.0-1014.14 15 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure`pkg:deb/ubuntu/linux-azure?arch=source&distro=resolute`Other threats	Affected 6.17.0-1003.3 – 7.0.0-1017.17 15 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure-fde`pkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resolute`Other threats	Affected 7.0.0-1003.3 – 7.0.0-1016.16 9 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-gcp`pkg:deb/ubuntu/linux-gcp?arch=source&distro=resolute`Other threats	Affected 6.17.0-1002.2 – 7.0.0-1014.14 13 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-gke`pkg:deb/ubuntu/linux-gke?arch=source&distro=resolute`Other threats	Affected 7.0.0-1002.3 – 7.0.0-1008.9 6 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been implemented in the Linux kernel to cap the number of MSI-X vectors to the device MSI-X table size using pci_msix_vec_count(). Users should update to a patched kernel version containing this fix. Since no vendor advisory or patch links are provided, check the Linux kernel release notes or distribution advisories for the official fixed versions and apply updates accordingly.

Description

A vulnerability in the Linux kernel's net: mana driver has been resolved that involved improper capping of MSI-X vectors to the device's MSI-X table size. The issue caused the driver to potentially access memory beyond the allocated MSI-X table when handling interrupts on systems with a large number of virtual CPUs, leading to a kernel page fault. This was due to the driver sizing usable MSI-X vectors from CPU count and response values but not limiting it to the actual device MSI-X table size.

Impact

The vulnerability can cause a kernel page fault due to out-of-bounds memory access when setting up MSI-X interrupts in the net: mana driver on affected Linux kernel versions. This may lead to system instability or crashes on systems with large numbers of virtual CPUs using this driver. There is no indication of code execution or privilege escalation from the provided data.

Summary

The Linux kernel net: mana driver did not properly cap the number of MSI-X vectors to the device's MSI-X table size. Specifically, mana_gd_query_max_resources() sized gc->num_msix_usable based on resp.max_msix and CPU count but ignored the device MSI-X table size. On large vCPU systems, this caused mana_gd_setup_remaining_irqs() to index beyond the mapped MSI-X region, causing a kernel page fault. The root cause was that msi_insert_desc() checked the index only against the MSI domain hwsize, which did not correspond to the device table size in global PCI/MSI domains. The fix involved capping num_msix_usable with pci_msix_vec_count() to prevent out-of-bounds access.

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 24 Oct 2026, 21:22 UTC

Technical details

References

Community reviews

Related threats