# smb: client: Fix use-after-free in cifs_try_adding_channels()

CVE record · `CVE-2026-74608`

- **Identifiers:** `CVE-2026-74608`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 22 Aug 2026
- **Updated:** 16 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 22 Aug 2026, 15:31 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.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `cbc53148cc0946b72d62a3c53870cb22ce4ec284 to before 64d7584e62ac8cdc750455c5fdc6008fc2de4f06` (git)
  - affected: `cff97d683a083b862a8bb24309e0f4d2d928128a to before c292d4686f717c03e5022fc4ae7c782f39a94915` (git)
  - affected: `6aac002bcfd554aff6d3ebb55e1660d078d70ab0 to before 47dfac48bce7198ad4f1a388fc8c9491f878ac3b` (git)
  - affected: `6aac002bcfd554aff6d3ebb55e1660d078d70ab0 to before 1ffacbadc14530e55b8d86f7b917524f6a0fb891` (git)
  - affected: `6aac002bcfd554aff6d3ebb55e1660d078d70ab0 to before 1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805` (git)
  - affected: `6aac002bcfd554aff6d3ebb55e1660d078d70ab0 to before 4986410316b1ae0e63c6ce418e4eb196723626e7` (git)
  - affected: `22a6c5b3425f327e7f4c3606a72277dce82c7d83` (git)
  - affected: `6.1.78 to before 6.1.183` (semver)
  - affected: `6.6.17 to before 6.6.152` (semver)
  - affected: `6.7.5 to before 6.8` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.8`
  - unaffected: `before 6.8` (semver)
  - unaffected: `6.1.183 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.152 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.104 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.45 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.9 to 7.1.*, 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0048, the 41st 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 22 Aug 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-74608](https://www.cve.org/CVERecord?id=CVE-2026-74608)
- [NVD: CVE-2026-74608](https://nvd.nist.gov/vuln/detail/CVE-2026-74608)

### References from the CNA

- <https://git.kernel.org/stable/c/64d7584e62ac8cdc750455c5fdc6008fc2de4f06>
- <https://git.kernel.org/stable/c/c292d4686f717c03e5022fc4ae7c782f39a94915>
- <https://git.kernel.org/stable/c/47dfac48bce7198ad4f1a388fc8c9491f878ac3b>
- <https://git.kernel.org/stable/c/1ffacbadc14530e55b8d86f7b917524f6a0fb891>
- <https://git.kernel.org/stable/c/1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805>
- <https://git.kernel.org/stable/c/4986410316b1ae0e63c6ce418e4eb196723626e7>

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-2026-74608>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-74608/>. Everything for agents: <https://agentprime.io/llms.txt>.