# RDMA/rvt: Return NULL after port allocation failure

CVE record · `CVE-2026-93104`

- **Identifiers:** `CVE-2026-93104`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 17 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:11 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: `ff6acd69518e0a84bd9c9b7f1bd4313f7076db97 to before 32d2cdb0f3cac430b04124c3b7248851fe2037f8` (git)
  - affected: `ff6acd69518e0a84bd9c9b7f1bd4313f7076db97 to before b7129930d1ec46c03a0de07fdce6c29f75795006` (git)
  - affected: `ff6acd69518e0a84bd9c9b7f1bd4313f7076db97 to before 5a1a7a5e2fe1a15824fa9ae5edd8f008259471d1` (git)
  - affected: `ff6acd69518e0a84bd9c9b7f1bd4313f7076db97 to before 80968b42d13080bf7bc1f3ee17fef126ce2ad98f` (git)
  - affected: `ff6acd69518e0a84bd9c9b7f1bd4313f7076db97 to before b1e1b25723af44328524c7b54433e4bf0ab9930c` (git)
  - affected: `ff6acd69518e0a84bd9c9b7f1bd4313f7076db97 to before 2982eaf3b9d2d953318c74cd6f1b7576ea6d7b1f` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.6`
  - unaffected: `before 4.6` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.114 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.57 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.6 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 RDMA/rvt (rvt_alloc_device) is affected from 4.6 up to the fixes in the listed stable versions. When the port array allocation fails, the function frees the IB device but still returns its pointer, so callers dereference freed memory (use-after-free). The source does not describe the attacker's required access or the impact beyond this. Upgrade to a fixed Linux kernel version from the stable branch that contains the fix; no workaround is listed.

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:** 0.0018, the 7th 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 17 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-93104](https://www.cve.org/CVERecord?id=CVE-2026-93104)
- [NVD: CVE-2026-93104](https://nvd.nist.gov/vuln/detail/CVE-2026-93104)

### References from the CNA

- <https://git.kernel.org/stable/c/32d2cdb0f3cac430b04124c3b7248851fe2037f8>
- <https://git.kernel.org/stable/c/b7129930d1ec46c03a0de07fdce6c29f75795006>
- <https://git.kernel.org/stable/c/5a1a7a5e2fe1a15824fa9ae5edd8f008259471d1>
- <https://git.kernel.org/stable/c/80968b42d13080bf7bc1f3ee17fef126ce2ad98f>
- <https://git.kernel.org/stable/c/b1e1b25723af44328524c7b54433e4bf0ab9930c>
- <https://git.kernel.org/stable/c/2982eaf3b9d2d953318c74cd6f1b7576ea6d7b1f>

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-2026-93104>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-93104/>. Everything for agents: <https://agentprime.io/llms.txt>.