CVE-2021-33574
criticalThe mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free.
Vendor / product: Gnu — glibc
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 caller, leading to a denial of service (application crash) or possibly unspecified other impact.
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2021-05-25 22:15
Modified: 2026-10-14 12:17
NVD status: Modified
Last synced 3 days ago
Verified against the source API 2026-10-27 07:06 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
gnu / glibc 2.32, 2.33
fedoraproject / fedora 33, 34
netapp / cloud_backup all versions
netapp / e-series_santricity_os_controller ≥11.0 ≤11.70.1
netapp / solidfire_baseboard_management_controller_firmware all versions
netapp / h300s_firmware all versions
netapp / h500s_firmware all versions
netapp / h700s_firmware all versions
netapp / h300e_firmware all versions
netapp / h500e_firmware all versions
netapp / h700e_firmware all versions
netapp / h410s_firmware all versions
debian / debian_linux 10.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html cve@mitre.org
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/m... cve@mitre.org
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/m... cve@mitre.org
- https://security.gentoo.org/glsa/202107-07 cve@mitre.org
- https://security.netapp.com/advisory/ntap-20210629-0005/ cve@mitre.org
- https://sourceware.org/bugzilla/show_bug.cgi?id=27896 cve@mitre.org
- https://sourceware.org/bugzilla/show_bug.cgi?id=27896#c1 cve@mitre.org
- https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html af854a3a-2127-422b-91ae-364da2661108
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/m... af854a3a-2127-422b-91ae-364da2661108
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/m... af854a3a-2127-422b-91ae-364da2661108
- https://security.gentoo.org/glsa/202107-07 af854a3a-2127-422b-91ae-364da2661108
- https://security.netapp.com/advisory/ntap-20210629-0005/ af854a3a-2127-422b-91ae-364da2661108
- https://sourceware.org/bugzilla/show_bug.cgi?id=27896 af854a3a-2127-422b-91ae-364da2661108
- https://sourceware.org/bugzilla/show_bug.cgi?id=27896#c1 af854a3a-2127-422b-91ae-364da2661108
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
- https://cert-portal.siemens.com/productcert/html/ssa-831302.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:06 UTC · record ↗