# RDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz()

CVE record · `CVE-2026-97421`

- **Identifiers:** `CVE-2026-97421`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 24 Sept 2026
- **Updated:** 3 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 24 Sept 2026, 16:03 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: `a40c20dabdf9045270767c75918feb67f0727c89 to before 3014da7587ce006cd08004fd6b257626b314e0a3` (git)
  - affected: `a40c20dabdf9045270767c75918feb67f0727c89 to before ddccf6cc3861de2fe60986933bead79220e0d797` (git)
  - affected: `a40c20dabdf9045270767c75918feb67f0727c89 to before e9bbb5f5349ef560ff6f0395564f04c3aa664559` (git)
  - affected: `a40c20dabdf9045270767c75918feb67f0727c89 to before ae3cf7d2c4d506c5c91746321644e1a08d989e2a` (git)
  - affected: `a40c20dabdf9045270767c75918feb67f0727c89 to before 5fc5b73109540809b094710fac44da81dd8a3ff8` (git)
  - affected: `a40c20dabdf9045270767c75918feb67f0727c89 to before 09ea6837a0434fb4db99528a5055b6d822135dcf` (git)
  - affected: `85e40ba1c4a5246b35e91c2ed69d4680426904d7` (git)
  - affected: `59f07434b297e2268f5d5c567db5b09145245cf1` (git)
  - affected: `488229b7729d7becf4c39c5e74fb709fb35115c2` (git)
  - affected: `5.4.73 to before 5.5` (semver)
  - affected: `5.8.17 to before 5.9` (semver)
  - affected: `5.9.2 to before 5.10` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.10`
  - unaffected: `before 5.10` (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: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.53 to 6.18.*, 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0013, the 2nd percentile, on 12 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 24 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-97421](https://www.cve.org/CVERecord?id=CVE-2026-97421)
- [NVD: CVE-2026-97421](https://nvd.nist.gov/vuln/detail/CVE-2026-97421)

### References from the CNA

- <https://git.kernel.org/stable/c/3014da7587ce006cd08004fd6b257626b314e0a3>
- <https://git.kernel.org/stable/c/ddccf6cc3861de2fe60986933bead79220e0d797>
- <https://git.kernel.org/stable/c/e9bbb5f5349ef560ff6f0395564f04c3aa664559>
- <https://git.kernel.org/stable/c/ae3cf7d2c4d506c5c91746321644e1a08d989e2a>
- <https://git.kernel.org/stable/c/5fc5b73109540809b094710fac44da81dd8a3ff8>
- <https://git.kernel.org/stable/c/09ea6837a0434fb4db99528a5055b6d822135dcf>

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-2026-97421>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-97421/>. Everything for agents: <https://agentprime.io/llms.txt>.