CVE-2026-99057
In the Linux kernel, the following vulnerability has been resolved: xen/netfront: don't leak the skb when xennet_fill_frags() fails When a response chain has more slots than fit in the skb's frags, xennet_fill_frags() returns an error and xennet_poll() jumps to its error path. That path moves what's left on tmpq to errq to be freed, but the skb being filled was already dequeued from tmpq, so it's never freed. Each chain that overflows leaks the skb and the pages attached to it as frags, and the backend decides how many slots it sends. Put the skb back on tmpq before taking the error path, like the xennet_set_skb_gso() failure just above it does.
Affected versions
Linux kernel versions
4.4.159,
4.9.130,
4.14.73,
4.18.11,
4.19
and later are affected. Fixed in
6.6.160,
6.12.113,
6.18.57,
7.2.11,
7.3
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-99057?
CVE-2026-99057 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.4.159 onward and has been patched in 6.6.160, 6.12.113, 6.18.57 and others. CVE-2026-99057 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-2026-99057?
Yes. CVE-2026-99057 has been patched. Fixed versions include 6.6.160, 6.12.113, 6.18.57 and others. If you are running Linux kernel 4.4.159 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-99057 actively exploited?
No. CVE-2026-99057 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.