SB2026072733 - Out-of-bounds write in Linux kernel firmware arm_ffa driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-64520)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds write in the arm ffa partition information retrieval logic in drivers/firmware/arm_ffa/driver.c when processing firmware-provided partition descriptor indices in the register-based PARTITION_INFO_GET path. A local user can provide inconsistent descriptor counts or index progressions to cause a denial of service.

Exploitation requires interaction with untrusted or malformed firmware responses.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/3974ea1938406f9bfa7c1f48d4e43533f447bb08
• https://git.kernel.org/stable/c/79d95c02ae0a95e6e80e8e92b7ca74ecee02854f
• https://git.kernel.org/stable/c/f39bc7ebe75e2186b417a024a7f7e2fd4cc7eb95