In the Linux kernel, the following vulnerability has been resolved: riscv: errata: select RISCV_ALTERNATIVE_EARLY for THEAD GHOSTWRITE …
CVE-2026-99017 · GHSA-67f9-vvv7-wpq7 · EUVD-2026-108811 · published 23 Oct 2026
How serious is it
- Severity: high, CVSS score 7 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-99017?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: patch: 7.2.11
- Linux Linux: patch: 0
- Linux Linux: patch: 6.18.57
- Linux Linux: 4bf97069239bcfca9840936313c7ac35a6e04488 <fa465a7819ecbe5801b78c088d3cadaf2664b8ca
- Linux Linux: patch: 7.3
- Linux Linux: 4bf97069239bcfca9840936313c7ac35a6e04488 <7fee577a2fa78b9a76da015beec1ccf978746ebb
- Linux Linux: 6.14
- Linux Linux: 4bf97069239bcfca9840936313c7ac35a6e04488 <298510bbc7c3017c0faf481c6ea66f1065b657b4
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
In the Linux kernel, the following vulnerability has been resolved:
riscv: errata: select RISCV_ALTERNATIVE_EARLY for THEAD GHOSTWRITE
errata_probe_ghostwrite() only marks the CPU as vulnerable when it is
called at the RISCV_ALTERNATIVES_EARLY_BOOT stage, and the mitigation
in ghostwrite_enable_mitigation() only takes effect if the vulnerable
state was recorded before the boot alternatives are patched.
The early boot stage is only executed when CONFIG_RISCV_ALTERNATIVE_EARLY
is enabled, which currently is only selected by ERRATA_THEAD_MAE. In a
kernel built with ERRATA_THEAD_GHOSTWRITE=y but ERRATA_THEAD_MAE=n, the
early alternatives never run, so ghostwrite_state is never set to
VULNERABLE: ghostwrite_enable_mitigation() returns false, xtheadvector
remains enabled, and sysfs reports "Not affected" on a vulnerable
T-Head C9xx CPU.
Select RISCV_ALTERNATIVE_EARLY from ERRATA_THEAD_GHOSTWRITE so that the
vulnerability is detected in the early boot stage and the default
mitigation is applied.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/fa465a7819ecbe5801b78c088d3cadaf2664b8ca
- git.kernel.org/stable/c/7fee577a2fa78b9a76da015beec1ccf978746ebb
- git.kernel.org/stable/c/298510bbc7c3017c0faf481c6ea66f1065b657b4
- nvd.nist.gov/vuln/detail/CVE-2026-99017
Merged from ENISA EUVD. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON