# CVE-2026-63832: wifi: mt76: add wcid publish check in mt76_sta_add

CVE-2026-63832 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-63832, released July 20, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-63832
- Priority: High
- CVSS: 8.8 (Important)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 19, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63832

## Description

In the Linux kernel, the following vulnerability has been resolved:  wifi: mt76: add wcid publish check in mt76_sta_add  Since mt7925_mac_sta_add publishes wcid, add publish check in mt76_sta_add to avoid reinitializing the wcid->poll_list.  Found dev->sta_poll_list corruption when using mt7925 and 7.1-rc4. According to the corruption information, prev->next was changed to itself.  wlan0: disconnect from AP 90:fb:5d:94:8b:e3 for new auth to 90:fb:5d:94:8b:e2 wlan0: authenticate with 90:fb:5d:94:8b:e2 (local address=84:9e:56:9c:7e:6b) wlan0: send auth to 90:fb:5d:94:8b:e2 (try 1/3)  slab kmalloc-8k start ffff8c80958a6000 pointer offset 4160 size 8192 list_add corruption. prev->next should be next (ffff8c808a7488f8), but was ffff8c80958a7040. (prev=ffff8c80958a7040).   mt76_wcid_add_poll+0x95/0xd0 [mt76]  mt7925_mac_add_txs.part.0+0xa5/0xe0 [mt7925_common]  mt7925_rx_check+0xa7/0xc0 [mt7925_common]  mt76_dma_rx_poll+0x50d/0x790 [mt76]  mt792x_poll_rx+0x52/0xe0 [mt792x_lib]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-63832](https://patchblox.com/security/data/fix/linux/debian-cve-2026-63832.md) | Jul 20, 2026 |
| Linux | linux Debian 14 | 7.1.3-1 | [DEBIAN-CVE-2026-63832](https://patchblox.com/security/data/fix/linux/debian-cve-2026-63832.md) | Jul 20, 2026 |

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Data as of 2026-11-10T01:44:33Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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