CVE-2026-80779: Linux kernel · net/ionic: avoid OOB TX partner lookup for hwstamp RXQ
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 4 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.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| 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 address this vulnerability. Users should apply the official kernel updates that include this patch. Since no cloud service is involved, remediation depends on updating the affected Linux kernel versions once the patch is released. Patch status is not explicitly confirmed in the provided data; users should consult the vendor or kernel maintainers for the official patch availability and apply updates accordingly.
Description
In the Linux kernel, the following vulnerability has been resolved: net/ionic: avoid OOB TX partner lookup for hwstamp RXQ The dedicated hardware timestamp RX queue is allocated with q->index equal to lif->ionic->nrxqs_per_lif. The normal txqcqs array only contains the regular queue pairs, so using that index to set rxq->partner can read one entry past txqcqs[] and then write through the derived pointer. Only link RX/TX partners for normal queue-pair indexes. Leave the hwstamp RX queue unpaired, and make the XDP_TX path abort cleanly if an RX queue has no TX partner.
References
- nvd.nist.gov/vuln/detail/CVE-2026-80779 (opens in a new tab)
- git.kernel.org/stable/c/39fc615e355b65b8d43be30da57aa95ae6eaf688 (opens in a new tab)
- git.kernel.org/stable/c/881a805a8029ba48c0ce81c6674910f8d83f7afb (opens in a new tab)
- git.kernel.org/stable/c/d92255b405fb6f5acca408239ccd742e0a42c9cb (opens in a new tab)
- git.kernel.org/stable/c/ea081b4435515ac7177eb598a3c0678d1b9e7911 (opens in a new tab)
- git.kernel.org/stable/c/f3868046e8e2e761d4d943a232bd109ff22a7d5b (opens in a new tab)
- ubuntu.com/security/CVE-2026-80779 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-80779 (opens in a new tab)
- git.kernel.org/linus/d92255b405fb6f5acca408239ccd742e0a42c9cb (opens in a new tab)