# dma-buf: dma-heap: don't publish fd before copy_to_user() succeeds

CVE record · `CVE-2026-89996`

- **Identifiers:** `CVE-2026-89996`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 16 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 10:33 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: `c02a81fba74fe3488ad6b08bfb5a1329005418f8 to before 1953ef8d11eb5870fe621259708a90900bead272` (git)
  - affected: `c02a81fba74fe3488ad6b08bfb5a1329005418f8 to before ad61defb3e66ac0c598ad6f39b57f15784543d46` (git)
  - affected: `c02a81fba74fe3488ad6b08bfb5a1329005418f8 to before 1bf6083a41f810d760c4dcd1b80c5194a92575aa` (git)
  - affected: `c02a81fba74fe3488ad6b08bfb5a1329005418f8 to before 69d57dbadb27ffd5eef34fd184bab145500cdabc` (git)
  - affected: `c02a81fba74fe3488ad6b08bfb5a1329005418f8 to before 0d4a5d218055db29b50cc07d3d73d27007c2a391` (git)
  - affected: `c02a81fba74fe3488ad6b08bfb5a1329005418f8 to before 30d0aff2c65a277135cfd8ea28fa1ee75e0ea4e0` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.6`
  - unaffected: `before 5.6` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.112 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.52 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.5 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.

> Linux kernel dma-heap (DMA_HEAP_IOCTL_ALLOC) is affected from 5.6 until fixed in 6.1.191, 6.6.160, 6.12.112 and 6.18.52. A local user can trigger a failed copy back to userspace, leaking a dma-buf file descriptor and its reference for the life of the process. Upgrade to a fixed kernel version.

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 11th 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 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89996](https://www.cve.org/CVERecord?id=CVE-2026-89996)
- [NVD: CVE-2026-89996](https://nvd.nist.gov/vuln/detail/CVE-2026-89996)

### References from the CNA

- <https://git.kernel.org/stable/c/1953ef8d11eb5870fe621259708a90900bead272>
- <https://git.kernel.org/stable/c/ad61defb3e66ac0c598ad6f39b57f15784543d46>
- <https://git.kernel.org/stable/c/1bf6083a41f810d760c4dcd1b80c5194a92575aa>
- <https://git.kernel.org/stable/c/69d57dbadb27ffd5eef34fd184bab145500cdabc>
- <https://git.kernel.org/stable/c/0d4a5d218055db29b50cc07d3d73d27007c2a391>
- <https://git.kernel.org/stable/c/30d0aff2c65a277135cfd8ea28fa1ee75e0ea4e0>

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-2026-89996>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89996/>. Everything for agents: <https://agentprime.io/llms.txt>.