# smb: client: discard post-EOF pagecache when extending a file via zero range

CVE record · `CVE-2026-98686`

- **Identifiers:** `CVE-2026-98686`
- **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:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 18 Oct 2026, 15:45 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: `72c419d9b073628d3b5b0b2fc787b724f1a8c726 to before 1ecf89d8efca618e0c758c06b9a1fdde8bd941da` (git)
  - affected: `72c419d9b073628d3b5b0b2fc787b724f1a8c726 to before 03408d15c5405f8dc3e1a114cdce2174027a85f6` (git)
  - affected: `72c419d9b073628d3b5b0b2fc787b724f1a8c726 to before 3df27277f8f95345d4a6c57367824bf1aefdbf66` (git)
  - affected: `72c419d9b073628d3b5b0b2fc787b724f1a8c726 to before 94949b6b2f2bf0dba2e8786aed0b08cc6bc3a183` (git)
  - affected: `72c419d9b073628d3b5b0b2fc787b724f1a8c726 to before b75dadb50a25eed525264bf6fea44fad94e7626f` (git)
  - affected: `72c419d9b073628d3b5b0b2fc787b724f1a8c726 to before 6a8279c98ad289b27c0bdb11adb3f0c0b7fd456d` (git)
  - affected: `72c419d9b073628d3b5b0b2fc787b724f1a8c726 to before da4fe97fb6c730d9c94a115c7bfa6f98e0d578d0` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.1`
  - unaffected: `before 5.1` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.113 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.56 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.10 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:** 0.0017, the 6th 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-2026-98686](https://www.cve.org/CVERecord?id=CVE-2026-98686)
- [NVD: CVE-2026-98686](https://nvd.nist.gov/vuln/detail/CVE-2026-98686)

### References from the CNA

- <https://git.kernel.org/stable/c/1ecf89d8efca618e0c758c06b9a1fdde8bd941da>
- <https://git.kernel.org/stable/c/03408d15c5405f8dc3e1a114cdce2174027a85f6>
- <https://git.kernel.org/stable/c/3df27277f8f95345d4a6c57367824bf1aefdbf66>
- <https://git.kernel.org/stable/c/94949b6b2f2bf0dba2e8786aed0b08cc6bc3a183>
- <https://git.kernel.org/stable/c/b75dadb50a25eed525264bf6fea44fad94e7626f>
- <https://git.kernel.org/stable/c/6a8279c98ad289b27c0bdb11adb3f0c0b7fd456d>
- <https://git.kernel.org/stable/c/da4fe97fb6c730d9c94a115c7bfa6f98e0d578d0>

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-2026-98686>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98686/>. Everything for agents: <https://agentprime.io/llms.txt>.