{"id":"CVE-2021-33574","title":"The mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free","summary":"The mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free. It may use the notification thread attributes object (passed through its struct sigevent parameter) after it has been freed by the calle…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416"],"vendor":"gnu","product":"glibc","affected":["glibc = 2.32","glibc = 2.33","fedora = 33","fedora = 34","cloud_backup","e-series_santricity_os_controller >= 11.0, <= 11.70.1","solidfire_baseboard_management_controller_firmware","h300s_firmware","h500s_firmware","h700s_firmware","h300e_firmware","h500e_firmware","h700e_firmware","h410s_firmware","debian_linux = 10.0"],"published":"2021-05-25","updated":"2026-10-14","sourceUpdated":"2026-10-14T12:17:12.520","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-33574","references":[{"url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KJYYIMDDYOHTP2PORLABTOHYQYYREZDD/","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RBUUWUGXVILQXVWEOU7N42ICHPJNAEUP/","label":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/202107-07","label":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20210629-0005/","label":"cve@mitre.org"},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=27896","label":"cve@mitre.org"},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=27896#c1","label":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KJYYIMDDYOHTP2PORLABTOHYQYYREZDD/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RBUUWUGXVILQXVWEOU7N42ICHPJNAEUP/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202107-07","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20210629-0005/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=27896","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=27896#c1","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-831302.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.02874,"epssPercentile":0.86481,"ingestedAt":"2026-10-14T12:29:10.819Z","slug":"CVE-2021-33574","body":"## Overview\n\nThe mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free. It may use the notification thread attributes object (passed through its struct sigevent parameter) after it has been freed by the caller, leading to a denial of service (application crash) or possibly unspecified other impact.\n\n## Affected\n\n- `glibc = 2.32`\n- `glibc = 2.33`\n- `fedora = 33`\n- `fedora = 34`\n- `cloud_backup`\n- `e-series_santricity_os_controller >= 11.0, <= 11.70.1`\n- `solidfire_baseboard_management_controller_firmware`\n- `h300s_firmware`\n- `h500s_firmware`\n- `h700s_firmware`\n- `h300e_firmware`\n- `h500e_firmware`\n- `h700e_firmware`\n- `h410s_firmware`\n- `debian_linux = 10.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.6,"exploitation":0,"ransomware":0},"changes":[]}