# CVE-2026-90348: wifi: ath10k: snoc: use memcpy_fromio() for MSA ramdump

> A kernel crash occurs in the ath10k WiFi driver when collecting firmware dumps on specific hardware due to unaligned memory access, causing a denial of service.

- **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:** AZL-102615, BELL-CVE-2026-90348, DEBIAN-CVE-2026-90348, GHSA-72gw-r7x5-6v8v, UBUNTU-CVE-2026-90348

## What is CVE-2026-90348?

CVE-2026-90348 is a denial of service 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: ath10k: snoc: use memcpy_fromio() for MSA ramdump

On WCN3990/SNOC the MSA region is mapped with devm_memremap(MEMREMAP_WT).
On arm64 such a mapping is not Normal-cacheable, so unaligned accesses to
it are not permitted. ath10k_msa_dump_memory() copies the region with a
plain memcpy(), whose optimized __pi_memcpy_generic implementation issues
wide/unaligned loads. This triggers an alignment fault (FSC=0x21) Oops in
ath10k_snoc_fw_crashed_dump() while collecting the devcoredump:

  Unable to handle kernel paging request ... FSC=0x21: alignment fault
  pc : __pi_memcpy_generic
  lr : ath10k_snoc_fw_crashed_dump [ath10k_snoc]

The Oops both leaves the firmware RAM dump buffer zeroed (no dump is
captured) and crashes the kernel, which in turn breaks modem SSR
recovery.

Use memcpy_fromio(), which only performs accesses that are valid for such
a device-memory mapping. The generic memcpy_fromio() implementation aligns
the source before issuing word-sized reads and stores the destination with
put_unaligned(), so it is also safe for the coherent DMA allocation used on
the non-reserved-memory path. ath11k and ath12k use the same pattern
when copying target memory into crash dumps, so call it unconditionally
here too.
The MEMREMAP_WT pointer is a plain void *, so an explicit __iomem cast is
needed; use __force to keep sparse happy.

Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.3.7.c5-00107-QCAHLSWMTPL-1

## Which versions are affected by CVE-2026-90348?


## How do I fix CVE-2026-90348?

Apply the vendor's patch.

## Is CVE-2026-90348 being exploited?

There is no known exploitation of CVE-2026-90348 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90348 and fix it if it is affected.

What it is: CVE-2026-90348 is a denial of service 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-2026-90348 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-2026-90348/ (Markdown: https://insights.sbomify.com/CVE-2026-90348/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90348
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90348
- OSV: https://osv.dev/vulnerability/CVE-2026-90348

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90348/
Summaries are generated and may contain mistakes; the official description above is the record.