# squashfs: Add dictionary size range check to prevent shift-out-of-bounds

CVE record · `CVE-2026-98636`

- **Identifiers:** `CVE-2026-98636`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 18 Oct 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 18 Oct 2026, 15:20 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: `ff750311d30acc9564ef577050794953eee59f01 to before b02948a23455f8190a53887b2d2c13ae1d360cea` (git)
  - affected: `ff750311d30acc9564ef577050794953eee59f01 to before 9d9c5c218ea356a1d88765214ad2919605280ab1` (git)
  - affected: `ff750311d30acc9564ef577050794953eee59f01 to before 7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1` (git)
  - affected: `ff750311d30acc9564ef577050794953eee59f01 to before c68e0068a236f9a7dfc19720bdf11e5d80a85089` (git)
  - affected: `ff750311d30acc9564ef577050794953eee59f01 to before 88c673a0bd233df44ca0020da82f4fd3876de27a` (git)
  - affected: `ff750311d30acc9564ef577050794953eee59f01 to before 0cb85377daaefb4ce5ce72975f2deb27ee0e0cad` (git)
  - affected: `ff750311d30acc9564ef577050794953eee59f01 to before e1ca4e3a380ef3e8f46ce006f1146392e3f32c98` (git)
  - affected: `ff750311d30acc9564ef577050794953eee59f01 to before 1f7745fb3580152ca902ef181b605f33cabfb1d0` (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: `6.12.112 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.55 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.9 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0018, the 7th percentile, on 7 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 18 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-98636](https://www.cve.org/CVERecord?id=CVE-2026-98636)
- [NVD: CVE-2026-98636](https://nvd.nist.gov/vuln/detail/CVE-2026-98636)

### References from the CNA

- <https://git.kernel.org/stable/c/b02948a23455f8190a53887b2d2c13ae1d360cea>
- <https://git.kernel.org/stable/c/9d9c5c218ea356a1d88765214ad2919605280ab1>
- <https://git.kernel.org/stable/c/7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1>
- <https://git.kernel.org/stable/c/c68e0068a236f9a7dfc19720bdf11e5d80a85089>
- <https://git.kernel.org/stable/c/88c673a0bd233df44ca0020da82f4fd3876de27a>
- <https://git.kernel.org/stable/c/0cb85377daaefb4ce5ce72975f2deb27ee0e0cad>
- <https://git.kernel.org/stable/c/e1ca4e3a380ef3e8f46ce006f1146392e3f32c98>
- <https://git.kernel.org/stable/c/1f7745fb3580152ca902ef181b605f33cabfb1d0>

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-2026-98636>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98636/>. Everything for agents: <https://agentprime.io/llms.txt>.