VulnerabilityPublished 17 Sep 2026Updated 6 Oct 2026

CVE-2026-90080: Linux kernel · octeontx2-pf: fix NULL deref of af_xdp_zc_qidx on rep setup

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 for this vulnerability has been implemented in the Linux kernel by adding NULL checks before dereferencing af_xdp_zc_qidx. Users should apply the official kernel updates that include this fix. Since this is a kernel-level issue, upgrading to patched kernel versions is the recommended remediation. Patch status is not explicitly confirmed in the provided data; users should consult their Linux distribution vendor advisories for the exact fixed kernel versions.

Description

A vulnerability in the Linux kernel related to the octeontx2-pf driver has been fixed. The issue involves a NULL pointer dereference of af_xdp_zc_qidx during representor setup, which can cause kernel oops when devlink eswitch mode is enabled. The flaw arises because some code paths use test_bit() on a NULL pointer without checking for NULL. The fix adds NULL checks before these uses in multiple kernel subsystems. This vulnerability affects specific Linux kernel versions used in various Ubuntu LTS releases.

Impact

This vulnerability can cause a kernel oops (crash) when devlink eswitch mode is enabled and representors are created, due to dereferencing a NULL pointer. This can lead to denial of service on affected systems running vulnerable Linux kernel versions. There is no indication of code execution or privilege escalation from the provided data.

Summary

The Linux kernel vulnerability CVE-2026-90080 involves a NULL pointer dereference in the octeontx2-pf driver. The af_xdp_zc_qidx pointer, which tracks receive queues using AF_XDP zero-copy, is allocated during PF/VF probe but remains NULL for representors and other non-AF_XDP paths. Several call sites unconditionally use test_bit() on this pointer, leading to a kernel oops when devlink eswitch mode creates representors and triggers otx2_init_hw_resources() and otx2_pool_aq_init(). The patch adds NULL checks before every test_bit() call on af_xdp_zc_qidx in the RSS, ethtool, XSK, and pool initialization paths to prevent dereferencing NULL pointers.

References

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Exploitation evidence

What to do

Affected software

Description

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

Technical details

References

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