# s390/ctcm: Prevent XID null dereference

CVE record · `CVE-2026-99126`

- **Identifiers:** `CVE-2026-99126`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 28 Oct 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 28 Oct 2026, 10:34 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: `293d984f0e3604c04dcdbf00117ddc1e5d4b1909 to before f9d9e2dadc9fbdfe01aeb6581978c3b59092919e` (git)
  - affected: `293d984f0e3604c04dcdbf00117ddc1e5d4b1909 to before a7c3e1795e4fe5e6680cab7cd7eee0503b00a248` (git)
  - affected: `293d984f0e3604c04dcdbf00117ddc1e5d4b1909 to before c11e435d334e4c311eaaf721e179a5ca6852c221` (git)
  - affected: `293d984f0e3604c04dcdbf00117ddc1e5d4b1909 to before 977dac6cc5531a8e058df05b6af94406b940cb9e` (git)
  - affected: `293d984f0e3604c04dcdbf00117ddc1e5d4b1909 to before 1525fb6e2f9f9a2c8c8723ee0959b1130a6b8213` (git)
  - affected: `293d984f0e3604c04dcdbf00117ddc1e5d4b1909 to before 34fa3607b7604b3052b19cec8b0ad644818cdd2a` (git)
  - affected: `293d984f0e3604c04dcdbf00117ddc1e5d4b1909 to before 8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab` (git)
  - affected: `293d984f0e3604c04dcdbf00117ddc1e5d4b1909 to before b264d8422779d69febce914efc47a92a85cc382c` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.26`
  - unaffected: `before 2.6.26` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.161 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.115 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.59 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.13 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

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0018, the 7th percentile, on 5 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 28 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-99126](https://www.cve.org/CVERecord?id=CVE-2026-99126)
- [NVD: CVE-2026-99126](https://nvd.nist.gov/vuln/detail/CVE-2026-99126)

### References from the CNA

- <https://git.kernel.org/stable/c/f9d9e2dadc9fbdfe01aeb6581978c3b59092919e>
- <https://git.kernel.org/stable/c/a7c3e1795e4fe5e6680cab7cd7eee0503b00a248>
- <https://git.kernel.org/stable/c/c11e435d334e4c311eaaf721e179a5ca6852c221>
- <https://git.kernel.org/stable/c/977dac6cc5531a8e058df05b6af94406b940cb9e>
- <https://git.kernel.org/stable/c/1525fb6e2f9f9a2c8c8723ee0959b1130a6b8213>
- <https://git.kernel.org/stable/c/34fa3607b7604b3052b19cec8b0ad644818cdd2a>
- <https://git.kernel.org/stable/c/8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab>
- <https://git.kernel.org/stable/c/b264d8422779d69febce914efc47a92a85cc382c>

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-2026-99126>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99126/>. Everything for agents: <https://agentprime.io/llms.txt>.