CVE-2026-68400

Publication date 10 August 2026

Last updated 9 October 2026

Ubuntu priority

Cvss 3 Severity Score

Description

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_ffa: Fix Endpoint Memory Access Descriptor offset calculation Use the descriptor's `ep_mem_offset` to calculate the start of the endpoint memory access array and to comply with the FF-A spec instead of defaulting to `sizeof(struct ffa_mem_region)`. This requires moving `ffa_mem_region_additional_setup()` earlier in the setup flow. Also, add sanity checks to ensure the calculated descriptor offsets do not exceed `max_fragsize`.

Status

Show unmaintained releases

Package	Ubuntu Release	Status

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.8 · High

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	7.8 · High
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-8888-1
Linux kernel (Azure) vulnerabilities
6 October 2026

USN-8889-1
Linux kernel (OEM) vulnerabilities
6 October 2026

USN-8887-1
Linux kernel vulnerabilities
6 October 2026

USN-8886-1
Linux kernel (NVIDIA Tegra) vulnerabilities
6 October 2026

USN-8887-2
Linux kernel (AWS) vulnerabilities
8 October 2026

USN-8888-2
Linux kernel (Azure) vulnerabilities
8 October 2026

USN-8887-3
Linux kernel vulnerabilities
9 October 2026