SB2026073077 - Ubuntu update for linux-nvidia
Published: July 30, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Out-of-bounds write (CVE-ID: CVE-2026-64520)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 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/E:U/U:Clear
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.
2) Race condition (CVE-ID: CVE-2026-53354)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 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/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper synchronization in broadcast TLBI completion handling in the arm64 CPU errata logic when performing broadcast TLB invalidation on affected Arm CPUs. A local user can trigger memory management activity to cause a denial of service.
The issue affects completion of memory accesses translated by an invalidated TLB entry, while TLB invalidation itself still occurs correctly.
Remediation
Install update from vendor's website.