CVE-2026-43092: Linux kernel · xsk: validate MTU against usable frame size on bind
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 11 Nov 2026, 23:24 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- EPSS
- 0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 6 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.
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).
References
- git.kernel.org/stable/c/a55793e5a97d4e39bdb380873a9780fe0010bff6 (opens in a new tab)
- git.kernel.org/stable/c/f669d60db11dbabb96279f2b20f9d1cba43cddb2 (opens in a new tab)
- git.kernel.org/stable/c/25e1e91a8da819924df0b16e3812d7b24c8ce133 (opens in a new tab)
- git.kernel.org/stable/c/b2f4daa6422fd6cc0cec969794dab4a88ea4cea1 (opens in a new tab)
- git.kernel.org/stable/c/36ee60b569ba0dfb6f961333b90d19ab5b323fa9 (opens in a new tab)