# CVE-2022-48876: linux: In the Linux kernel, the following vulnerability has been resolved:  wifi: mac80211: fix initialization of rx->link a...

CVE-2022-48876 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48876, released August 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48876
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  wifi: mac80211: fix initialization of rx->link and rx->link_sta  There are some codepaths that do not initialize rx->link_sta properly. This causes a crash in places which assume that rx->link_sta is valid if rx->sta is valid. One known instance is triggered by __ieee80211_rx_h_amsdu being called from fast-rx. It results in a crash like this one:   BUG: kernel NULL pointer dereference, address: 00000000000000a8  #PF: supervisor write access in kernel mode  #PF: error_code(0x0002) - not-present page PGD 0 P4D 0  Oops: 0002 [#1] PREEMPT SMP PTI  CPU: 1 PID: 506 Comm: mt76-usb-rx phy Tainted: G            E      6.1.0-debian64x+1.7 #3  Hardware name: ZOTAC ZBOX-ID92/ZBOX-IQ01/ZBOX-ID92/ZBOX-IQ01, BIOS B220P007 05/21/2014  RIP: 0010:ieee80211_deliver_skb+0x62/0x1f0 [mac80211]  Code: 00 48 89 04 24 e8 9e a7 c3 df 89 c0 48 03 1c c5 a0 ea 39 a1 4c 01 6b 08 48 ff 03 48        83 7d 28 00 74 11 48 8b 45 30 48 63 55 44 <48> 83 84 d0 a8 00 00 00 01 41 8b 86 c0        11 00 00 8d 50 fd 83 fa 01  RSP: 0018:ffff999040803b10 EFLAGS: 00010286  RAX: 0000000000000000 RBX: ffffb9903f496480 RCX: 0000000000000000  RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000  RBP: ffff999040803ce0 R08: 0000000000000000 R09: 0000000000000000  R10: 0000000000000000 R11: 0000000000000000 R12: ffff8d21828ac900  R13: 000000000000004a R14: ffff8d2198ed89c0 R15: ffff8d2198ed8000  FS:  0000000000000000(0000) GS:ffff8d24afe80000(0000) knlGS:0000000000000000  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033  CR2: 00000000000000a8 CR3: 0000000429810002 CR4: 00000000001706e0  Call Trace:   <TASK>   __ieee80211_rx_h_amsdu+0x1b5/0x240 [mac80211]   ? ieee80211_prepare_and_rx_handle+0xcdd/0x1320 [mac80211]   ? __local_bh_enable_ip+0x3b/0xa0   ieee80211_prepare_and_rx_handle+0xcdd/0x1320 [mac80211]   ? prepare_transfer+0x109/0x1a0 [xhci_hcd]   ieee80211_rx_list+0xa80/0xda0 [mac80211]   mt76_rx_complete+0x207/0x2e0 [mt76]   mt76_rx_poll_complete+0x357/0x5a0 [mt76]   mt76u_rx_worker+0x4f5/0x600 [mt76_usb]   ? mt76_get_min_avg_rssi+0x140/0x140 [mt76]   __mt76_worker_fn+0x50/0x80 [mt76]   kthread+0xed/0x120   ? kthread_complete_and_exit+0x20/0x20   ret_from_fork+0x22/0x30  Since the initialization of rx->link and rx->link_sta is rather convoluted and duplicated in many places, clean it up by using a helper function to set it.  [remove unnecessary rx->sta->sta.mlo check]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.8-1 | [DEBIAN-CVE-2022-48876](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48876.md) | Aug 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.1.8-1 | [DEBIAN-CVE-2022-48876](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48876.md) | Aug 21, 2024 |
| Linux | linux Debian 14 | 6.1.8-1 | [DEBIAN-CVE-2022-48876](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48876.md) | Aug 21, 2024 |

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