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CVE-2021-47633

HIGH 7.1 ALL-YEARS

Published 2025-02-26 · Last modified 2026-05-11 · Linux · NVD: Analyzed

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 ? api

ELEVATED IMPACT

Severe if exploited (CVSS 7.1), but no confirmed exploitation. Patch on a normal cadence.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 18th percentile

○ In CISA KEV○ Catalogued PoC

Impact if exploited

7.1CVSS 3.1 · HIGH · NVD

  • ConfidentialityHigh
  • IntegrityNone
  • AvailabilityHigh

What an attacker needs

  • ⚠Access: Requires local access to the host
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

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Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Affected

Vendors Linux

Products Linux Linux Kernel

Weakness (CWE)

  • CWE-125: Out-of-bounds read

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

References and research data (JSON)

Vendor product assessments

Showing 32 of 274 vendor product statements; 242 omitted. Read the full vendor advisory.

  • kernel as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-abi-whitelists as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-abi-whitelists

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-bootwrapper as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-bootwrapper

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-debug as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-debug

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-debug-devel as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-debug-devel

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-devel as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-devel

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-doc as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-doc

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-firmware as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-firmware

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-headers as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-headers

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-kdump as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-kdump

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-kdump-devel as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-kdump-devel

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel.src as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel?arch=src

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • perf as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/perf

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • python-perf as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/python-perf

    • no fix planned: Out of support scope
    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-abi-stablelists as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-abi-stablelists

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-modules-extra as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-modules-extra

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-rt-debug as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-debug

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-uki-virt as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-uki-virt

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • bpftool as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bpftool

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-rt-devel as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-devel

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-abi-whitelists as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-abi-whitelists

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-modules-internal as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-modules-internal

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-rt-selftests-internal as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-selftests-internal

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • bpftool as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bpftool

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-64k-modules-core as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-64k-modules-core

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-debug-modules-partner as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-debug-modules-partner

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-rt-64k-core as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-64k-core

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-rt-64k-modules-core as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-64k-modules-core

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-rt-devel-matched as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-devel-matched

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • kernel-zfcpdump as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-zfcpdump

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00
  • rv as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/rv

    Red Hat · CVE-2021-47633 · Updated 2026-06-29T22:44:41+00:00

Known Affected Software Configurations

VendorProductVersion range
LinuxLinux Kernel≥ 2.6.30 and < 4.9.311
LinuxLinux Kernel≥ 4.10 and < 4.14.276
LinuxLinux Kernel≥ 4.15 and < 4.19.238
LinuxLinux Kernel≥ 4.20 and < 5.4.189
LinuxLinux Kernel≥ 5.5 and < 5.10.111
LinuxLinux Kernel≥ 5.11 and < 5.15.34
LinuxLinux Kernel≥ 5.16 and < 5.16.20
LinuxLinux Kernel≥ 5.17 and < 5.17.3

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS