{"id":"DEBIAN-CVE-2021-47633","details":"In the Linux kernel, the following vulnerability has been resolved:  ath5k: fix OOB in ath5k_eeprom_read_pcal_info_5111  The bug was found during fuzzing. Stacktrace locates it in ath5k_eeprom_convert_pcal_info_5111. When none of the curve is selected in the loop, idx can go up to AR5K_EEPROM_N_PD_CURVES. The line makes pd out of bound. pd = &chinfo[pier].pd_curves[idx];  There are many OOB writes using pd later in the code. So I added a sanity check for idx. Checks for other loops involving AR5K_EEPROM_N_PD_CURVES are not needed as the loop index is not used outside the loops.  The patch is NOT tested with real device.  The following is the fuzzing report  BUG: KASAN: slab-out-of-bounds in ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k] Write of size 1 at addr ffff8880174a4d60 by task modprobe/214  CPU: 0 PID: 214 Comm: modprobe Not tainted 5.6.0 #1 Call Trace:  dump_stack+0x76/0xa0  print_address_description.constprop.0+0x16/0x200  ? ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]  ? ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]  __kasan_report.cold+0x37/0x7c  ? ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]  kasan_report+0xe/0x20  ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]  ? apic_timer_interrupt+0xa/0x20  ? ath5k_eeprom_init_11a_pcal_freq+0xbc0/0xbc0 [ath5k]  ? ath5k_pci_eeprom_read+0x228/0x3c0 [ath5k]  ath5k_eeprom_init+0x2513/0x6290 [ath5k]  ? ath5k_eeprom_init_11a_pcal_freq+0xbc0/0xbc0 [ath5k]  ? usleep_range+0xb8/0x100  ? apic_timer_interrupt+0xa/0x20  ? ath5k_eeprom_read_pcal_info_2413+0x2f20/0x2f20 [ath5k]  ath5k_hw_init+0xb60/0x1970 [ath5k]  ath5k_init_ah+0x6fe/0x2530 [ath5k]  ? kasprintf+0xa6/0xe0  ? ath5k_stop+0x140/0x140 [ath5k]  ? _dev_notice+0xf6/0xf6  ? apic_timer_interrupt+0xa/0x20  ath5k_pci_probe.cold+0x29a/0x3d6 [ath5k]  ? ath5k_pci_eeprom_read+0x3c0/0x3c0 [ath5k]  ? mutex_lock+0x89/0xd0  ? ath5k_pci_eeprom_read+0x3c0/0x3c0 [ath5k]  local_pci_probe+0xd3/0x160  pci_device_probe+0x23f/0x3e0  ? pci_device_remove+0x280/0x280  ? pci_device_remove+0x280/0x280  really_probe+0x209/0x5d0","modified":"2026-09-01T20:03:23.234625400Z","published":"2025-02-26T06:37:05.060Z","upstream":["CVE-2021-47633"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2021-47633"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47633.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47633.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47633.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:N/A:H"}]}