CVE-2026-46322
In the Linux kernel, the following vulnerability has been resolved: tun: free page on build_skb failure in tun_xdp_one() When build_skb() fails in tun_xdp_one(), the function sets ret to -ENOMEM and jumps to the out label, which returns without freeing the page that vhost_net_build_xdp() allocated for the frame. As with the short-frame rejection path, tun_sendmsg() discards the per-buffer error and still returns total_len, so vhost_tx_batch() takes the success path and never frees the page. Each build_skb() failure in a batch leaks one page-frag chunk. Free the page before taking the error path, matching the put_page() the other error exits of tun_xdp_one() already perform.
Affected versions
Linux kernel versions
4.20
and later are affected. Fixed in
6.12.93,
6.18.35,
7.0.12,
7.1-rc6
and their respective stable series.
References
The following references provide additional information about CVE-2026-46322 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/4fefc6156a162a9f50035c12091a5e5130c82c6e
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PatchKernel patch commithttps://git.kernel.org/stable/c/aa308e9dbb9acb17cacdbbce9e4504f69bac8385
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PatchKernel patch commithttps://git.kernel.org/stable/c/aa8963fdce667a42fb7f0bdd2909fadcab02f9a8
Frequently asked questions
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What is CVE-2026-46322?
CVE-2026-46322 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.20 onward and has been patched in 6.12.93, 6.18.35, 7.0.12 and others. CVE-2026-46322 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-2026-46322?
Yes — CVE-2026-46322 has been patched. Fixed versions include 6.12.93, 6.18.35, 7.0.12 and others. 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-2026-46322 actively exploited?
No — CVE-2026-46322 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.