CVE-2026-99057 is a vulnerability in Linux Kernel
Published on October 23, 2026
xen/netfront: don't leak the skb when xennet_fill_frags() fails
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.
Products Associated with CVE-2026-99057
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Affected Versions
Linux:- Version ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c and below 5051df031144753d3e18862514969146b601d089 is affected.
- Version ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c and below 99011a11c97340ef7290df7dc199305c73fab2f2 is affected.
- Version ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c and below 086944c1c2cbb683543bc3ff08637847b03c8009 is affected.
- Version ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c and below 84e3ea6502b5f14ce8d499d0b6e0e38386274cf0 is affected.
- Version ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c and below 93ccaf1c26e2133396173b76a071e59024daa622 is affected.
- Version bd1468048aa3e2af865da92990539946d4483989 is affected.
- Version 29a6193c0d74390c004808441061ac1812cf6f51 is affected.
- Version 7eced4478f4ec6ff0a603ddfd6e24a5d3831fca7 is affected.
- Version b73a161e9beff24bf1803ba393dff95a255268f9 is affected.
- Version 4.4.159 and below 4.5 is affected.
- Version 4.9.130 and below 4.10 is affected.
- Version 4.14.73 and below 4.15 is affected.
- Version 4.18.11 and below 4.19 is affected.
- Version 4.19 is affected.
- Before 4.19 is unaffected.
- Version 6.6.160, <= 6.6.* is unaffected.
- Version 6.12.113, <= 6.12.* is unaffected.
- Version 6.18.57, <= 6.18.* is unaffected.
- Version 7.2.11, <= 7.2.* is unaffected.
- Version 7.3, <= * is unaffected.