What’s Vulnerable › Vulnerabilities

CVE-2026-80779: net/ionic: avoid OOB TX partner lookup for hwstamp RXQ

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-10-19

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.

Affected products

• Linux kernel: 6.9 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/39fc615e355b65b8d43be30da57aa95ae6eaf688
• https://git.kernel.org/stable/c/881a805a8029ba48c0ce81c6674910f8d83f7afb
• https://git.kernel.org/stable/c/d92255b405fb6f5acca408239ccd742e0a42c9cb
• https://git.kernel.org/stable/c/ea081b4435515ac7177eb598a3c0678d1b9e7911
• https://git.kernel.org/stable/c/f3868046e8e2e761d4d943a232bd109ff22a7d5b

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