# xen/gntalloc: validate grant count before allocation

CVE record · `CVE-2026-98900`

- **Identifiers:** `CVE-2026-98900`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 23 Oct 2026
- **Updated:** 26 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 23 Oct 2026, 11:54 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: `dd3140588d9551235ebc2a0dacdca098e7677573 to before e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8` (git)
  - affected: `dd3140588d9551235ebc2a0dacdca098e7677573 to before 71a0cf87e19fb35c4292ca88985e376e613c900a` (git)
  - affected: `dd3140588d9551235ebc2a0dacdca098e7677573 to before 641de086a05f349de7fc548612432bc2fed721ca` (git)
  - affected: `dd3140588d9551235ebc2a0dacdca098e7677573 to before 720554c04acba80018ded069d3e0984bebaee891` (git)
  - affected: `dd3140588d9551235ebc2a0dacdca098e7677573 to before 84d5727cef8eb9c8a28210ad248f1c70b223b065` (git)
  - affected: `dd3140588d9551235ebc2a0dacdca098e7677573 to before 231542f4e43cf9837cb520664545e85fbe666b7b` (git)
  - affected: `dd3140588d9551235ebc2a0dacdca098e7677573 to before 2299822f3f466b5dcad2377bf63986199f881a6b` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.39`
  - unaffected: `before 2.6.39` (semver)
  - unaffected: `5.10.271 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.222 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.189 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.158 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.53 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2 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

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0018, the 7th percentile, on 6 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 23 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-98900](https://www.cve.org/CVERecord?id=CVE-2026-98900)
- [NVD: CVE-2026-98900](https://nvd.nist.gov/vuln/detail/CVE-2026-98900)

### References from the CNA

- <https://git.kernel.org/stable/c/e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8>
- <https://git.kernel.org/stable/c/71a0cf87e19fb35c4292ca88985e376e613c900a>
- <https://git.kernel.org/stable/c/641de086a05f349de7fc548612432bc2fed721ca>
- <https://git.kernel.org/stable/c/720554c04acba80018ded069d3e0984bebaee891>
- <https://git.kernel.org/stable/c/84d5727cef8eb9c8a28210ad248f1c70b223b065>
- <https://git.kernel.org/stable/c/231542f4e43cf9837cb520664545e85fbe666b7b>
- <https://git.kernel.org/stable/c/2299822f3f466b5dcad2377bf63986199f881a6b>

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-2026-98900>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98900/>. Everything for agents: <https://agentprime.io/llms.txt>.