Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xsk: validate MTU against usable frame size on bind AF_XDP bind currently accepts zero-copy pool configurations without verifying that the device MTU fits into the usable frame space provided by the UMEM chunk. This becomes a problem since we started to respect tailroom which is subtracted from chunk_size (among with headroom). 2k chunk size might not provide enough space for standard 1500 MTU, so let us catch such settings at bind time. Furthermore, validate whether underlying HW will be able to satisfy configured MTU wrt XSK's frame size multiplied by supported Rx buffer chain length (that is exposed via net_device::xdp_zc_max_segs).
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.6, < 6.6.136 |
References
- https://git.kernel.org/stable/c/25e1e91a8da819924df0b16e3812d7b24c8ce133Patch
- https://git.kernel.org/stable/c/36ee60b569ba0dfb6f961333b90d19ab5b323fa9Patch
- https://git.kernel.org/stable/c/a55793e5a97d4e39bdb380873a9780fe0010bff6Patch
- https://git.kernel.org/stable/c/b2f4daa6422fd6cc0cec969794dab4a88ea4cea1Patch
- https://git.kernel.org/stable/c/f669d60db11dbabb96279f2b20f9d1cba43cddb2Patch
FAQ
What is CVE-2026-43092?
CVE-2026-43092 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: xsk: validate MTU against usable frame size on bind AF_XDP bind currently accepts zero-copy pool configurations without verifying ...
How severe is CVE-2026-43092?
CVE-2026-43092 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43092?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.