# TOCTOU double copyin in illumos dld ioctl handling causes kernel heap corruption

CVE record · `CVE-2026-15449`

- **Identifiers:** `CVE-2026-15449`
- **State:** Confirmed
- **Severity:** CVSS 5.8 Medium
- **Critical:** No
- **CNA:** illumos
- **Weakness (CWE):** [CWE-122](https://cwe.mitre.org/data/definitions/122.html) · [CWE-367](https://cwe.mitre.org/data/definitions/367.html)
- **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md) · [Race condition](https://agentprime.io/advisories/tag/race-condition.md)
- **Technologies:** [illumos-gate](https://agentprime.io/advisories/technology/illumos-gate.md) · [OmniOS](https://agentprime.io/advisories/technology/omnios.md) · [Triton Data Center SmartOS](https://agentprime.io/advisories/technology/triton-data-center-smartos.md)
- **Published:** 16 Jul 2026
- **Updated:** 17 Jul 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: illumos) at 16 Jul 2026, 19:27 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: illumos. Product: illumos-gate.
  - affected: `eae72b5b807baa9116e64502cbb278edf15f3146 to before 6959feb5b430411a4809b06c53dcdb42fb525eac` (git)
  - Other versions: affected
- Vendor: OmniOS. Product: OmniOS.
  - affected: `any to before r151054` (custom)
  - affected: `r151058 to before r151058j` (custom)
  - affected: `r151056 to before r151056aj` (custom)
  - affected: `r151054 to before r151054bj` (custom)
  - Other versions: affected
- Vendor: Triton Data Center. Product: SmartOS.
  - affected: `any to before 202060709` (custom)
  - 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

- 5.8 Medium, CVSS 4.0: `CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N`, from CNA (illumos)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0012, the 1st 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 16 Jul 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-15449](https://www.cve.org/CVERecord?id=CVE-2026-15449)
- [NVD: CVE-2026-15449](https://nvd.nist.gov/vuln/detail/CVE-2026-15449)

### References from the CNA

- <https://illumos.topicbox.com/groups/developer/T923147fae854a738-M03c29e1be33dac2a5e3d9535/18020-double-copyin-of-dldioc-consumers> (mailing-list)
- <https://illumos.org/issues/18020> (issue-tracking)
- <https://github.com/illumos/illumos-gate/commit/6959feb5b430411a4809b06c53dcdb42fb525eac> (patch)

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-2026-15449>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-15449/>. Everything for agents: <https://agentprime.io/llms.txt>.