Medium 5.5Published May 6, 2026

CVE-2026-43092xsk: validate MTU against usable frame size on bind

Updated under an hour ago (Oct 27, 2026, 2:50 PM ET)

Does this affect you?

It affects Linux and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

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: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 24ea50127ecf0efe819c1f6230add27abc6ca9d9 before a55793e5a97d4e39bdb380873a9780fe0010bff6; from 24ea50127ecf0efe819c1f6230add27abc6ca9d9 before f669d60db11dbabb96279f2b20f9d1cba43cddb2; from 24ea50127ecf0efe819c1f6230add27abc6ca9d9 before 25e1e91a8da819924df0b16e3812d7b24c8ce133; from 24ea50127ecf0efe819c1f6230add27abc6ca9d9 before b2f4daa6422fd6cc0cec969794dab4a88ea4cea1; from 24ea50127ecf0efe819c1f6230add27abc6ca9d9 before 36ee60b569ba0dfb6f961333b90d19ab5b323fa9	CNA record
linux linux_kernel linux:linux_kernel	from 6.6 before 6.6.136; from 6.7 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.14; 7.0; 7.0; 7.0; 7.0; and 3 more ranges	NVD

References

References

https://git.kernel.org/stable/c/a55793e5a97d4e39bdb380873a9780fe0010bff6	patch
https://git.kernel.org/stable/c/f669d60db11dbabb96279f2b20f9d1cba43cddb2	patch
https://git.kernel.org/stable/c/25e1e91a8da819924df0b16e3812d7b24c8ce133	patch
https://git.kernel.org/stable/c/b2f4daa6422fd6cc0cec969794dab4a88ea4cea1	patch
https://git.kernel.org/stable/c/36ee60b569ba0dfb6f961333b90d19ab5b323fa9	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.