CVE-2026-99030 net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits()
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99030?
CVE-2026-99030 is a high-severity vulnerability in Linux, published on 23 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits()
When skb_copy_and_csum_bits() reaches unreadable frags it returns 0 after copying only the linear part, and the rest of the caller's buffer is left as it was. The callers copy into a buffer that is about to go out on the wire: an ICMP error quoting the offending packet, or a driver's TX bounce buffer in skb_copy_and_csum_dev(). Neither buffer is zeroed beforehand, so whatever was in memory there gets sent.
Zero the part of the buffer we didn't fill. The checksum usually won't match the data any more, so the receiver will usually drop the packet, but either way it no longer carries anything it shouldn't. Only zero for a positive @len, a negative one from a broken caller must not turn into a huge memset().
Which versions are affected by CVE-2026-99030?
How do I fix CVE-2026-99030?
Upgrade to a fixed version.
Is CVE-2026-99030 being exploited?
There is no known exploitation of CVE-2026-99030 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-99030, DEBIAN-CVE-2026-99030, GHSA-2m74-g73v-pv5c, UBUNTU-CVE-2026-99030.