Observable discrepancy in Linux kernel - CVE-2026-43261
Published: May 7, 2026
Vulnerability identifier: #VU130436
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43261
CWE-ID: CWE-203
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local attacker to disclose sensitive information.
The vulnerability exists due to observable timing discrepancy in branch prediction on TSV110 arm64 processors when executing code that influences branch history. A local attacker can perform a Spectre-BHB side-channel attack to disclose sensitive information.
The issue is specific to TSV110 processors.
How to mitigate CVE-2026-43261
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/598c11dd4f4a9de31d854fcb9702f54c1c70f0d0
- https://git.kernel.org/stable/c/5dbe1f14359735fa50ba0dd4a496125b5bc7f422
- https://git.kernel.org/stable/c/a8d0ad5d990b050a6db74218a34b5529085e16b8
- https://git.kernel.org/stable/c/ad0c356cae164ed5dbd1f4cfd438e46faa5292cb
- https://git.kernel.org/stable/c/cccf96c49f61e47d9332d6a4d1c7fe9a2df44440
- https://git.kernel.org/stable/c/e3baa5d4b361276efeb87b20d8beced451a7dbd5
- https://git.kernel.org/stable/c/fd51d47fcacec3ca027eb65d8c44853d3b6cea95
- https://git.kernel.org/stable/c/fd7e360845d331f542854d552469544182e61134