# CVE-2021-47065: linux: In the Linux kernel, the following vulnerability has been resolved:  rtw88: Fix array overrun in rtw_get_tx_power_par...

CVE-2021-47065 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47065, released February 29, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47065
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 29, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  rtw88: Fix array overrun in rtw_get_tx_power_params()  Using a kernel with the Undefined Behaviour Sanity Checker (UBSAN) enabled, the following array overrun is logged:  ================================================================================ UBSAN: array-index-out-of-bounds in /home/finger/wireless-drivers-next/drivers/net/wireless/realtek/rtw88/phy.c:1789:34 index 5 is out of range for type 'u8 [5]' CPU: 2 PID: 84 Comm: kworker/u16:3 Tainted: G           O      5.12.0-rc5-00086-gd88bba47038e-dirty #651 Hardware name: TOSHIBA TECRA A50-A/TECRA A50-A, BIOS Version 4.50   09/29/2014 Workqueue: phy0 ieee80211_scan_work [mac80211] Call Trace:  dump_stack+0x64/0x7c  ubsan_epilogue+0x5/0x40  __ubsan_handle_out_of_bounds.cold+0x43/0x48  rtw_get_tx_power_params+0x83a/drivers/net/wireless/realtek/rtw88/0xad0 [rtw_core]  ? rtw_pci_read16+0x20/0x20 [rtw_pci]  ? check_hw_ready+0x50/0x90 [rtw_core]  rtw_phy_get_tx_power_index+0x4d/0xd0 [rtw_core]  rtw_phy_set_tx_power_level+0xee/0x1b0 [rtw_core]  rtw_set_channel+0xab/0x110 [rtw_core]  rtw_ops_config+0x87/0xc0 [rtw_core]  ieee80211_hw_config+0x9d/0x130 [mac80211]  ieee80211_scan_state_set_channel+0x81/0x170 [mac80211]  ieee80211_scan_work+0x19f/0x2a0 [mac80211]  process_one_work+0x1dd/0x3a0  worker_thread+0x49/0x330  ? rescuer_thread+0x3a0/0x3a0  kthread+0x134/0x150  ? kthread_create_worker_on_cpu+0x70/0x70  ret_from_fork+0x22/0x30 ================================================================================  The statement where an array is being overrun is shown in the following snippet:  	if (rate <= DESC_RATE11M) 		tx_power = pwr_idx_2g->cck_base[group]; 	else ====>		tx_power = pwr_idx_2g->bw40_base[group];  The associated arrays are defined in main.h as follows:  struct rtw_2g_txpwr_idx { 	u8 cck_base[6]; 	u8 bw40_base[5]; 	struct rtw_2g_1s_pwr_idx_diff ht_1s_diff; 	struct rtw_2g_ns_pwr_idx_diff ht_2s_diff; 	struct rtw_2g_ns_pwr_idx_diff ht_3s_diff; 	struct rtw_2g_ns_pwr_idx_diff ht_4s_diff; };  The problem arises because the value of group is 5 for channel 14. The trivial increase in the dimension of bw40_base fails as this struct must match the layout of efuse. The fix is to add the rate as an argument to rtw_get_channel_group() and set the group for channel 14 to 4 if rate <= DESC_RATE11M.  This patch fixes commit fa6dfe6bff24 ("rtw88: resolve order of tx power setting routines")

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.38-1 | [DEBIAN-CVE-2021-47065](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47065.md) | Feb 29, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.38-1 | [DEBIAN-CVE-2021-47065](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47065.md) | Feb 29, 2024 |
| Linux | linux Debian 14 | 5.10.38-1 | [DEBIAN-CVE-2021-47065](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47065.md) | Feb 29, 2024 |

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