CVE-2021-47633ath5k: fix OOB in ath5k_eeprom_read_pcal_info_5111
- 7.1HighCVSS base score
- 0.26%Exploitation in 30 daysEPSS · top 82% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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
Timeline
ID reserved
By Linux
Published
- 15 months later
· 15 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.26% · top 82% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Affected products
- affected 8e218fb24faef0bfe95bc91b3c05261e20439527 – < f4de974019a0adf34d0e7de6b86252f1bd266b06
- affected 8e218fb24faef0bfe95bc91b3c05261e20439527 – < ed3dfdaa8b5f0579eabfc1c5818eed30cfe1fe84
- affected 8e218fb24faef0bfe95bc91b3c05261e20439527 – < 25efc5d03455c3839249bc77fce5e29ecb54677e
- affected 8e218fb24faef0bfe95bc91b3c05261e20439527 – < c4e2f577271e158d87a916afb4e87415a88ce856
- affected 8e218fb24faef0bfe95bc91b3c05261e20439527 – < 9d7d83d0399e23d66fd431b553842a84ac10398f
- affected 8e218fb24faef0bfe95bc91b3c05261e20439527 – < be2f81024e7981565d90a4c9ca3067d11b6bca7f
- affected 8e218fb24faef0bfe95bc91b3c05261e20439527 – < fc8f7752a82f4accb99c0f1a868906ba1eb7b86f
- affected 8e218fb24faef0bfe95bc91b3c05261e20439527 – < cbd96d6cad6625feba9c8d101ed4977d53e82f8e
- affected 8e218fb24faef0bfe95bc91b3c05261e20439527 – < 564d4eceb97eaf381dd6ef6470b06377bb50c95a
- affected 2.6.30
- unaffected < 2.6.30
- unaffected 4.9.311 – ≤ 4.9.*
- unaffected 4.14.276 – ≤ 4.14.*
- unaffected 4.19.238 – ≤ 4.19.*
- unaffected 5.4.189 – ≤ 5.4.*
- unaffected 5.10.111 – ≤ 5.10.*
- unaffected 5.15.34 – ≤ 5.15.*
- unaffected 5.16.20 – ≤ 5.16.*
- unaffected 5.17.3 – ≤ 5.17.*
- unaffected 5.18 – ≤ *
References
References9
- https://git.kernel.org/stable/c/f4de974019a0adf34d0e7de6b86252f1bd266b06 (opens in a new tab)
- https://git.kernel.org/stable/c/ed3dfdaa8b5f0579eabfc1c5818eed30cfe1fe84 (opens in a new tab)
- https://git.kernel.org/stable/c/25efc5d03455c3839249bc77fce5e29ecb54677e (opens in a new tab)
- https://git.kernel.org/stable/c/c4e2f577271e158d87a916afb4e87415a88ce856 (opens in a new tab)
- https://git.kernel.org/stable/c/9d7d83d0399e23d66fd431b553842a84ac10398f (opens in a new tab)
- https://git.kernel.org/stable/c/be2f81024e7981565d90a4c9ca3067d11b6bca7f (opens in a new tab)
- https://git.kernel.org/stable/c/fc8f7752a82f4accb99c0f1a868906ba1eb7b86f (opens in a new tab)
- https://git.kernel.org/stable/c/cbd96d6cad6625feba9c8d101ed4977d53e82f8e (opens in a new tab)
- https://git.kernel.org/stable/c/564d4eceb97eaf381dd6ef6470b06377bb50c95a (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-34671 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-47633)Record last updated .