# smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs

CVE record · `CVE-2026-98171`

- **Identifiers:** `CVE-2026-98171`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 6 Oct 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 6 Oct 2026, 08:44 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: `b24df3e30cbf48255db866720fb71f14bf9d2f39 to before 1ed29f7a03417b405f38c09cfe04124883127b53` (git)
  - affected: `b24df3e30cbf48255db866720fb71f14bf9d2f39 to before 7f022867ec9f0166a0b4400385bb601b1c6b2c75` (git)
  - affected: `b24df3e30cbf48255db866720fb71f14bf9d2f39 to before 72eaef1f37a3b6bec11c342736834dc3707be3e4` (git)
  - affected: `b24df3e30cbf48255db866720fb71f14bf9d2f39 to before 491e33144dee872cffda207f6fcb09260728f803` (git)
  - affected: `b24df3e30cbf48255db866720fb71f14bf9d2f39 to before 8749946579708ea0d339034bb7f423a67dbe89cf` (git)
  - affected: `b24df3e30cbf48255db866720fb71f14bf9d2f39 to before 96c436e4b010711452b2872558938f4ef276492a` (git)
  - affected: `b24df3e30cbf48255db866720fb71f14bf9d2f39 to before 858d5ac22cb889266993e7670f9f0c4f4aeedd78` (git)
  - affected: `b24df3e30cbf48255db866720fb71f14bf9d2f39 to before 05762c5bc1cfdcac36747994fde2c04387a457f1` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.19`
  - unaffected: `before 4.19` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 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: `6.18.54 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.8 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0054, the 45th percentile, on 11 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 6 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-98171](https://www.cve.org/CVERecord?id=CVE-2026-98171)
- [NVD: CVE-2026-98171](https://nvd.nist.gov/vuln/detail/CVE-2026-98171)

### References from the CNA

- <https://git.kernel.org/stable/c/1ed29f7a03417b405f38c09cfe04124883127b53>
- <https://git.kernel.org/stable/c/7f022867ec9f0166a0b4400385bb601b1c6b2c75>
- <https://git.kernel.org/stable/c/72eaef1f37a3b6bec11c342736834dc3707be3e4>
- <https://git.kernel.org/stable/c/491e33144dee872cffda207f6fcb09260728f803>
- <https://git.kernel.org/stable/c/8749946579708ea0d339034bb7f423a67dbe89cf>
- <https://git.kernel.org/stable/c/96c436e4b010711452b2872558938f4ef276492a>
- <https://git.kernel.org/stable/c/858d5ac22cb889266993e7670f9f0c4f4aeedd78>
- <https://git.kernel.org/stable/c/05762c5bc1cfdcac36747994fde2c04387a457f1>

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-2026-98171>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98171/>. Everything for agents: <https://agentprime.io/llms.txt>.