{"id":"DEBIAN-CVE-2021-47065","details":"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:  \tif (rate \u003c= DESC_RATE11M) \t\ttx_power = pwr_idx_2g-\u003ecck_base[group]; \telse ====\u003e\t\ttx_power = pwr_idx_2g-\u003ebw40_base[group];  The associated arrays are defined in main.h as follows:  struct rtw_2g_txpwr_idx { \tu8 cck_base[6]; \tu8 bw40_base[5]; \tstruct rtw_2g_1s_pwr_idx_diff ht_1s_diff; \tstruct rtw_2g_ns_pwr_idx_diff ht_2s_diff; \tstruct rtw_2g_ns_pwr_idx_diff ht_3s_diff; \tstruct 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 \u003c= DESC_RATE11M.  This patch fixes commit fa6dfe6bff24 (\"rtw88: resolve order of tx power setting routines\")","modified":"2026-09-01T20:04:36.697486190Z","published":"2024-02-29T23:15:08Z","upstream":["CVE-2021-47065"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2021-47065"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.38-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47065.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.38-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47065.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.38-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47065.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}