# smb: client: fix request buffer leak in smb2_new_read_req()

CVE record · `CVE-2026-90125`

- **Identifiers:** `CVE-2026-90125`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 17 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:06 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: `bd3dcc6a22a9186ed78da51ce09e889803552189 to before 38daae149c2102d96833cc6acd79c8f98fcce208` (git)
  - affected: `bd3dcc6a22a9186ed78da51ce09e889803552189 to before 58066940076b90c16e821fd6f9767cd979cbdb5e` (git)
  - affected: `bd3dcc6a22a9186ed78da51ce09e889803552189 to before 12092ed28434bf41e08d41e3c5269eb6b337fc02` (git)
  - affected: `bd3dcc6a22a9186ed78da51ce09e889803552189 to before 442c5f1358ced0d4e716778ac06f1e323a7e4f21` (git)
  - affected: `bd3dcc6a22a9186ed78da51ce09e889803552189 to before 73f6bdb0380486ab37fe12cd74de20abfaf5d3ae` (git)
  - affected: `bd3dcc6a22a9186ed78da51ce09e889803552189 to before deb6468f4164640e4dc875f008aa449cf55987a5` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.16`
  - unaffected: `before 4.16` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.52 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.6 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The Linux kernel SMB client read path leaks a request buffer in smb2_new_read_req() when SMB Direct memory registration fails with -EAGAIN, and repeated retries leak more buffers. The source does not say who can trigger the failure, but it can accumulate memory over time. Affected kernels run from 4.16 until the fixes, so upgrade to 6.1.191, 6.6.157, 6.12.110, 6.18.52 or a later release in those series. No workaround is listed.

Written 12 Nov 2026.

## 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:** 0.0021, the 10th percentile, on 13 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 17 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90125](https://www.cve.org/CVERecord?id=CVE-2026-90125)
- [NVD: CVE-2026-90125](https://nvd.nist.gov/vuln/detail/CVE-2026-90125)

### References from the CNA

- <https://git.kernel.org/stable/c/38daae149c2102d96833cc6acd79c8f98fcce208>
- <https://git.kernel.org/stable/c/58066940076b90c16e821fd6f9767cd979cbdb5e>
- <https://git.kernel.org/stable/c/12092ed28434bf41e08d41e3c5269eb6b337fc02>
- <https://git.kernel.org/stable/c/442c5f1358ced0d4e716778ac06f1e323a7e4f21>
- <https://git.kernel.org/stable/c/73f6bdb0380486ab37fe12cd74de20abfaf5d3ae>
- <https://git.kernel.org/stable/c/deb6468f4164640e4dc875f008aa449cf55987a5>

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-2026-90125>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90125/>. Everything for agents: <https://agentprime.io/llms.txt>.