{"id":"CVE-2021-47006","state":"PUBLISHED","title":"ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook\n\nThe commit 1879445dfa7b (\"perf/core: Set event's default\n::overflow_handler()\") set a default event->overflow_handler in\nperf_event_alloc(), and replace the check event->overflow_handler with\nis_default_overflow_handler(), but one is missing.\n\nCurrently, the bp->overflow_handler can not be NULL. As a result,\nenable_single_step() is always not invoked.\n\nComments from Zhen Lei:\n\n https://patchwork.kernel.org/project/linux-arm-kernel/patch/20210207105934.2001-1-thunder.leizhen@huawei.com/","publishedAt":"2024-02-28T08:13:26.541Z","updatedAt":"2026-05-11T13:46:08.152Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1879445dfa7bbd6fe21b09c5cc72f4934798afed","status":"affected","lessThan":"555a70f7fff03bd669123487905c47ae27dbdaac","versionType":"git"},{"version":"1879445dfa7bbd6fe21b09c5cc72f4934798afed","status":"affected","lessThan":"ed1f67465327cec4457bb988775245b199da86e6","versionType":"git"},{"version":"1879445dfa7bbd6fe21b09c5cc72f4934798afed","status":"affected","lessThan":"a9938d6d78a238d6ab8de57a4d3dcf77adceb9bb","versionType":"git"},{"version":"1879445dfa7bbd6fe21b09c5cc72f4934798afed","status":"affected","lessThan":"3ed8832aeaa9a37b0fc386bb72ff604352567c80","versionType":"git"},{"version":"1879445dfa7bbd6fe21b09c5cc72f4934798afed","status":"affected","lessThan":"630146203108bf6b8934eec0dfdb3e46dcb917de","versionType":"git"},{"version":"1879445dfa7bbd6fe21b09c5cc72f4934798afed","status":"affected","lessThan":"7eeacc6728c5478e3c01bc82a1f08958eaa12366","versionType":"git"},{"version":"1879445dfa7bbd6fe21b09c5cc72f4934798afed","status":"affected","lessThan":"dabe299425b1a53a69461fed7ac8922ea6733a25","versionType":"git"},{"version":"1879445dfa7bbd6fe21b09c5cc72f4934798afed","status":"affected","lessThan":"a506bd5756290821a4314f502b4bafc2afcf5260","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm/kernel/hw_breakpoint.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"4.9.269","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.233","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.191","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.120","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.38","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.11.22","status":"unaffected","lessThanOrEqual":"5.11.*","versionType":"semver"},{"version":"5.12.5","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm/kernel/hw_breakpoint.c"]}],"references":["https://git.kernel.org/stable/c/555a70f7fff03bd669123487905c47ae27dbdaac","https://git.kernel.org/stable/c/ed1f67465327cec4457bb988775245b199da86e6","https://git.kernel.org/stable/c/a9938d6d78a238d6ab8de57a4d3dcf77adceb9bb","https://git.kernel.org/stable/c/3ed8832aeaa9a37b0fc386bb72ff604352567c80","https://git.kernel.org/stable/c/630146203108bf6b8934eec0dfdb3e46dcb917de","https://git.kernel.org/stable/c/7eeacc6728c5478e3c01bc82a1f08958eaa12366","https://git.kernel.org/stable/c/dabe299425b1a53a69461fed7ac8922ea6733a25","https://git.kernel.org/stable/c/a506bd5756290821a4314f502b4bafc2afcf5260"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47006.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47006","state":"PUBLISHED","datePublished":"2024-02-28T08:13:26.541Z","dateUpdated":"2026-05-11T13:46:08.152Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-27T18:42:55.952Z"},"containers":{"cna":{"title":"ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook\n\nThe commit 1879445dfa7b (\"perf/core: Set event's default\n::overflow_handler()\") set a default event->overflow_handler in\nperf_event_alloc(), and replace the check event->overflow_handler with\nis_default_overflow_handler(), but one is missing.\n\nCurrently, the bp->overflow_handler can not be NULL. 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