CVE-2026-98233

Description

In the Linux kernel, the following vulnerability has been resolved: net/packet: clear RX owner on VNET header error Commit 61fad6816fc1 ("net/packet: tpacket_rcv: avoid a producer race condition") added rx_owner_map and made tpacket_rcv() claim a V1 or V2 ring slot before converting the virtio-net header. If the conversion fails, the drop path leaves the slot claimed. With a one-frame TPACKET_V2 ring, an unsupported UDP GSO packet leaves the only slot unavailable, so the ring also drops the next valid packet. Clear the ownership bit on this error path. TPACKET_V3 already clears its block state here.

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EPSS — Exploit Prediction

0.0022

Probability of exploitation

0.11%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/23cd30498891d29a69ec9b75bd92f8a0f21f1342 https://git.kernel.org/stable/c/2daa618e7ff19eefcbda281bc4c5998c4140f9cf https://git.kernel.org/stable/c/33ff111d7ba3beb86e28938d6382bb5beabd865a https://git.kernel.org/stable/c/49a48a5aaf85fe69d2dc3fb334b4854fadf44e39 https://git.kernel.org/stable/c/693209a237fc548791cf402441db8b68d1da7d38 https://git.kernel.org/stable/c/805edbdcb8681da5f7ee43b3c3c809f7a8c31208 https://git.kernel.org/stable/c/b8c0cb3069058c2d67b5c7c833b2833381ecffdc https://git.kernel.org/stable/c/bb10a0084c03a94364aeec542beddc5d49b59f59

Frequently Asked Questions

What is CVE-2026-98233? +

In the Linux kernel, the following vulnerability has been resolved: net/packet: clear RX owner on VNET header error Commit 61fad6816fc1 ("net/packet: tpacket_rcv: avoid a producer race condition") added rx_owner_map and made tpacket_rcv() claim a V1 or V2 ring slot before converting the virtio-net header. If the conversion fails, the drop path leaves the slot claimed. With a one-frame TPACKET_V2 ring, an unsupported UDP GSO packet leaves the only slot unavailable, so the ring also drops the next valid packet. Clear the ownership bit on this error path. TPACKET_V3 already clears its block state here.

How do I check if I'm vulnerable to CVE-2026-98233? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.