# LoongArch: Do not save/restore percpu base register in rethook trampoline

CVE record · `CVE-2026-89903`

- **Identifiers:** `CVE-2026-89903`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 16 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 10:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `3f5536860086d906b01ec5ed68cf50c7edcc40af to before a03b5e7483ad2c33ba5dd2adb8552e84bfee8fe2` (git)
  - affected: `3f5536860086d906b01ec5ed68cf50c7edcc40af to before 8f15e95b438bc6b3c9f23a33c9a0d0678ebd1dc8` (git)
  - affected: `3f5536860086d906b01ec5ed68cf50c7edcc40af to before 266ffc92e68593759adfe3d58f188773d32782c3` (git)
  - affected: `3f5536860086d906b01ec5ed68cf50c7edcc40af to before c048b0a3c0836c4b1bef4b51d355d27090bf6790` (git)
  - affected: `3f5536860086d906b01ec5ed68cf50c7edcc40af to before c3f2feace5e4f4b01b68b9f947b19adb4155c32e` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.3`
  - unaffected: `before 6.3` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.5 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 7.8 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0018, the 7th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89903](https://www.cve.org/CVERecord?id=CVE-2026-89903)
- [NVD: CVE-2026-89903](https://nvd.nist.gov/vuln/detail/CVE-2026-89903)

### References from the CNA

- <https://git.kernel.org/stable/c/a03b5e7483ad2c33ba5dd2adb8552e84bfee8fe2>
- <https://git.kernel.org/stable/c/8f15e95b438bc6b3c9f23a33c9a0d0678ebd1dc8>
- <https://git.kernel.org/stable/c/266ffc92e68593759adfe3d58f188773d32782c3>
- <https://git.kernel.org/stable/c/c048b0a3c0836c4b1bef4b51d355d27090bf6790>
- <https://git.kernel.org/stable/c/c3f2feace5e4f4b01b68b9f947b19adb4155c32e>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-89903>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89903/>. Everything for agents: <https://agentprime.io/llms.txt>.