CVE-2026-43261 arm64: Add support for TSV110 Spectre-BHB mitigation
Attackers can exploit Spectre-BHB side channels on TSV110 processors to leak sensitive information from the Linux kernel.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43261?
CVE-2026-43261 is a medium-severity vulnerability in Linux kernel, published on 6 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
arm64: Add support for TSV110 Spectre-BHB mitigation
The TSV110 processor is vulnerable to the Spectre-BHB (Branch History Buffer) attack, which can be exploited to leak information through branch prediction side channels. This commit adds the MIDR of TSV110 to the list for software mitigation.
Which versions are affected by CVE-2026-43261?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43261?
Apply the vendor's patch.
Is CVE-2026-43261 being exploited?
There is no known exploitation of CVE-2026-43261 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43261, DEBIAN-CVE-2026-43261, GHSA-q2m9-5gr9-rjw9, ROOT-OS-DEBIAN-11-CVE-2026-43261, ROOT-OS-UBUNTU-2204-CVE-2026-43261, ROOT-OS-UBUNTU-2404-CVE-2026-43261 and 1 more.