SB20260919130 - Improper input validation in Linux kernel xdp

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-90086)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause unintended processing of transmit metadata.

The vulnerability exists due to improper input validation in the AF_XDP zero-copy transmit metadata handling when submitting transmit descriptors with UMEM metadata space without the XDP_TX_METADATA option set. A local user can submit specially crafted transmit descriptors to cause unintended processing of transmit metadata.

The issue is limited to zero-copy transmission with UMEM metadata space.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/53a5b262d706b572840cbe8feae392538077ee19
• https://git.kernel.org/stable/c/a6e4b9a6deb9362ef7a0706c70d674e92fe1411a
• https://git.kernel.org/stable/c/bf9387488d6394845076928c6ca5315ce5d84f54