CVE-2026-46320
In the Linux kernel, the following vulnerability has been resolved: tap: free page on error paths in tap_get_user_xdp() tap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL, and returns -ENOMEM when build_skb() fails. Both paths jump to the err label without freeing the page that vhost_net_build_xdp() allocated for the frame. tap_sendmsg() discards the per-buffer return value and always returns 0, so vhost_tx_batch() takes the success path and never frees the page; each rejected frame in a batch leaks one page-frag chunk. Free the page on both error paths, before the skb is built. This is the tap counterpart of the same leak in tun_xdp_one().
Affected versions
Linux kernel versions
4.20
and later are affected. Fixed in
7.0.12,
7.1-rc6
and their respective stable series.
References
The following references provide additional information about CVE-2026-46320 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/18a84c35842e19cd3c5534d8cee73d31863f696d
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PatchKernel patch commithttps://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2
Frequently asked questions
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What is CVE-2026-46320?
CVE-2026-46320 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.20 onward and has been patched in 7.0.12 and 7.1-rc6. CVE-2026-46320 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-46320?
Yes — CVE-2026-46320 has been patched. Fixed versions include 7.0.12 and 7.1-rc6. If you are running Linux kernel 4.20 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-46320 actively exploited?
No — CVE-2026-46320 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.