# RDMA/ucma: Serialize join and leave on copy_to_user failure

CVE record · `CVE-2026-98253`

- **Identifiers:** `CVE-2026-98253`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 6 Oct 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 6 Oct 2026, 08:45 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: `60d613b39e8d0c9f3b526e9c96445422b4562d76 to before 29b9ed83d8bfab5c6e11fcbf1aa836aa4ae26cb9` (git)
  - affected: `fe454dc31e84f8c14cb8942fcb61666c9f40745b to before 52172e11bd074ccaded21740ffeb67123f01dd00` (git)
  - affected: `fe454dc31e84f8c14cb8942fcb61666c9f40745b to before 01e29d0d78a8f66f221625720a04939eef5ec1f6` (git)
  - affected: `fe454dc31e84f8c14cb8942fcb61666c9f40745b to before ae805d204cf1f15b87d1bf3529b4c649f3519420` (git)
  - affected: `fe454dc31e84f8c14cb8942fcb61666c9f40745b to before 43c4e24bd10370fc976f6220518049ce71419399` (git)
  - affected: `fe454dc31e84f8c14cb8942fcb61666c9f40745b to before 01cbdb724c584d7772fd25af2e4dfdf8527ce0d5` (git)
  - affected: `fe454dc31e84f8c14cb8942fcb61666c9f40745b to before 83610ee5e498fa5bfcb80031d2b959baea276bf6` (git)
  - affected: `fe454dc31e84f8c14cb8942fcb61666c9f40745b to before 662ade4de9ff5eceb0820a9f8e9fac70ba6a815b` (git)
  - affected: `a3262b3884dd67b4c5632ce7cdf9cff9d1a575d4` (git)
  - affected: `5.10.20 to before 5.10.271` (semver)
  - affected: `5.11.3 to before 5.12` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.12`
  - unaffected: `before 5.12` (semver)
  - unaffected: `5.10.271 to 5.10.*, inclusive` (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: `6.12.112 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

- 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 10 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-2026-98253](https://www.cve.org/CVERecord?id=CVE-2026-98253)
- [NVD: CVE-2026-98253](https://nvd.nist.gov/vuln/detail/CVE-2026-98253)

### References from the CNA

- <https://git.kernel.org/stable/c/29b9ed83d8bfab5c6e11fcbf1aa836aa4ae26cb9>
- <https://git.kernel.org/stable/c/52172e11bd074ccaded21740ffeb67123f01dd00>
- <https://git.kernel.org/stable/c/01e29d0d78a8f66f221625720a04939eef5ec1f6>
- <https://git.kernel.org/stable/c/ae805d204cf1f15b87d1bf3529b4c649f3519420>
- <https://git.kernel.org/stable/c/43c4e24bd10370fc976f6220518049ce71419399>
- <https://git.kernel.org/stable/c/01cbdb724c584d7772fd25af2e4dfdf8527ce0d5>
- <https://git.kernel.org/stable/c/83610ee5e498fa5bfcb80031d2b959baea276bf6>
- <https://git.kernel.org/stable/c/662ade4de9ff5eceb0820a9f8e9fac70ba6a815b>

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-2026-98253>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98253/>. Everything for agents: <https://agentprime.io/llms.txt>.