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Vulnerability · Published Feb 28, 2024 · Assigned by Linux

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

Medium 5.5

In plain English

A medium-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.3%top 83.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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/

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.10.38-1DEBIAN-CVE-2021-47006
Debian:13linux5.10.38-1DEBIAN-CVE-2021-47006
Debian:14linux5.10.38-1DEBIAN-CVE-2021-47006
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-47006
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-47006
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-47006

Affected products (as reported)

VendorProductVersions
Linux Linux 1879445dfa7bbd6fe21b09c5cc72f4934798afed – before 555a70f7fff03bd669123487905c47ae27dbdaac1879445dfa7bbd6fe21b09c5cc72f4934798afed – before ed1f67465327cec4457bb988775245b199da86e61879445dfa7bbd6fe21b09c5cc72f4934798afed – before a9938d6d78a238d6ab8de57a4d3dcf77adceb9bb1879445dfa7bbd6fe21b09c5cc72f4934798afed – before 3ed8832aeaa9a37b0fc386bb72ff604352567c801879445dfa7bbd6fe21b09c5cc72f4934798afed – before 630146203108bf6b8934eec0dfdb3e46dcb917de1879445dfa7bbd6fe21b09c5cc72f4934798afed – before 7eeacc6728c5478e3c01bc82a1f08958eaa123661879445dfa7bbd6fe21b09c5cc72f4934798afed – before dabe299425b1a53a69461fed7ac8922ea6733a251879445dfa7bbd6fe21b09c5cc72f4934798afed – before a506bd5756290821a4314f502b4bafc2afcf5260
Linux Linux 4.7

References