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CVE-2026-43261: arm64: Add support for TSV110 Spectre-BHB mitigation

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-06 · updated 2026-06-17

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.

Affected products

• Linux kernel: from 5.10.105 before 5.10.252; from 5.11 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16 — fixed in 5.10.252, 5.15.202, 6.1.165, 6.12.75, 6.18.16, 6.19.6

How to fix

Upgrade to a fixed version: Linux kernel 5.10.252, 5.15.202, 6.1.165, 6.12.75. Check the vendor advisory for mitigations.

References

• 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

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