5.5

CVE-2021-47006: ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook

Analyzed
AliasesUBUNTU-CVE-2021-47006DEBIAN-CVE-2021-47006
Published 28-02-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47006 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 16.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.25%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 6 · Related 6
SUSE-SU-2024:1454-1SUSE-SU-2024:1465-1SUSE-SU-2024:1489-1SUSE-SU-2024:1643-1SUSE-SU-2024:1646-1SUSE-SU-2024:1870-1

Timeline

  1. 28-02-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook The commit 1879445dfa7b ("perf/core: Set event's default ::overflow_handler()") set a default event->overflow_handler in perf_event_alloc(), and replace the check event->overflow_handler with is_default_overflow_handler(), but one is missing. Currently, the bp->overflow_handler can not be NULL. As a result, enable_single_step() is always not invoked. Comments from Zhen Lei: https://patchwork.kernel.org/project/linux-arm-kernel/patch/20210207105934.2001-1-thunder.leizhen@huawei.com/

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.25% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu85 products
  • linux< 4.15.0-151.157 | < 5.4.0-80.90
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.15.0-1109.116 | < 5.4.0-1054.57
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 1879445dfa7bbd6fe21b09c5cc72f4934798afed, < 555a70f7fff03bd669123487905c47ae27dbdaac | ≥ 1879445dfa7bbd6fe21b09c5cc72f4934798afed, < ed1f67465327cec4457bb988775245b199da86e6 | ≥ 1879445dfa7bbd6fe21b09c5cc72f4934798afed, < a9938d6d78a238d6ab8de57a4d3dcf77adceb9bb | ≥ 1879445dfa7bbd6fe21b09c5cc72f4934798afed, < 3ed8832aeaa9a37b0fc386bb72ff604352567c80 | ≥ 1879445dfa7bbd6fe21b09c5cc72f4934798afed, < 630146203108bf6b8934eec0dfdb3e46dcb917de | ≥ 1879445dfa7bbd6fe21b09c5cc72f4934798afed, < 7eeacc6728c5478e3c01bc82a1f08958eaa12366 | ≥ 1879445dfa7bbd6fe21b09c5cc72f4934798afed, < dabe299425b1a53a69461fed7ac8922ea6733a25 | ≥ 1879445dfa7bbd6fe21b09c5cc72f4934798afed, < a506bd5756290821a4314f502b4bafc2afcf5260 | 4.7
  • linux_kernel≥ 4.7, < 4.9.269 | ≥ 4.10, < 4.14.233 | ≥ 4.15, < 4.19.191 | ≥ 4.20, < 5.4.120 | ≥ 5.5, < 5.10.38 | ≥ 5.11, < 5.11.22 | ≥ 5.12, < 5.12.5
Debian1 product
  • linux< 5.10.38-1

3 vendors · 88 products

References

12 links
Show all 12 references