# CVE-2026-93094: wifi: ath12k: fix dp_link_peer dangling references on AP vdev rollback

> A use-after-free in the ath12k WiFi driver allows attackers to cause denial of service or execute code via crafted wireless frames.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Sep 2026
- **Updated:** 19 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-93094, GHSA-vrjg-xqwj-3f35, UBUNTU-CVE-2026-93094

## What is CVE-2026-93094?

CVE-2026-93094 is an use after free vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

wifi: ath12k: fix dp_link_peer dangling references on AP vdev rollback

ath12k_mac_vdev_create() for an AP vdev creates the bss self-peer via
ath12k_peer_create(), which finishes by calling
ath12k_dp_link_peer_assign() to publish the dp_link_peer in the
dp_hw->dp_peers[peerid_index] RCU table, in the dp_peer's
link_peers[] array, and in the per-addr rhashtable.

If a step after ath12k_peer_create() fails the function jumps to
err_peer_del, which open-codes a WMI peer_delete and waits for the
unmap / delete_resp events. The wait_for_peer_delete_done() path
relies on ath12k_dp_link_peer_unmap_event() freeing the dp_link_peer
when the unmap arrives, but err_peer_del never calls
ath12k_dp_link_peer_unassign() first. The published references in
the dp_hw RCU table, dp_peer->link_peers[] and the rhashtable are
left pointing at the dp_link_peer that unmap_event then frees,
producing dangling pointers and use-after-free on subsequent
lookups.

Replace the open-coded sequence with a call to ath12k_peer_delete(),
which already does ath12k_dp_link_peer_unassign() before sending the
WMI command. This drops the published references before the
dp_link_peer is freed, in the same order as the normal teardown path
in ath12k_mac_remove_link_interface().

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3

## Which versions are affected by CVE-2026-93094?


## How do I fix CVE-2026-93094?

Apply the vendor's patch.

## Is CVE-2026-93094 being exploited?

There is no known exploitation of CVE-2026-93094 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93094 and fix it if it is affected.

What it is: CVE-2026-93094 is an use after free vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-93094 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-93094/ (Markdown: https://insights.sbomify.com/CVE-2026-93094/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93094
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93094
- OSV: https://osv.dev/vulnerability/CVE-2026-93094

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93094/
Summaries are generated and may contain mistakes; the official description above is the record.