Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | glibc | 2.32-1 | — |
| Debian 13 | glibc | 2.32-1 | — |
| Debian 12 | glibc | 2.32-1 | — |
| Debian 10 | glibc | 2.28-10+deb10u2 | DLA-3152-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | glibc | No fix yet | — |
| Ubuntu Pro 18.04 LTS | glibc | No fix yet | — |
| Ubuntu Pro 16.04 LTS | glibc | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | eglibc | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | nscd +212 | 2.28-164.el8 | RHSA-2021:4358 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | nss_hesiod +5 | 2.28-164.el8 | ALSA-2021:4358 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | glibc | 2.28-164.el8 | RLSA-2021:4358 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | glibc | 2.31-9.3.2 | SUSE-SU-2021:3291-1 |
| SLES 15 SP2 | glibc | 2.26-13.59.1 | SUSE-SU-2021:3385-1 |
| SLES 15 SP1 | glibc | 2.26-13.59.1 | SUSE-SU-2021:3385-1 |
| SLES 15 | glibc | 2.26-13.59.1 | SUSE-SU-2021:3385-1 |
| SLES 12 SP5 | glibc | 2.22-114.15.1 | SUSE-SU-2021:3290-1 |
Show 20 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | glibc | 2.22-114.15.1 | SUSE-SU-2021:3290-1 |
| SLES 12 SP3 | glibc | 2.22-116.1 | SUSE-SU-2021:3289-1 |
| SLES 12 SP2 | glibc | 2.22-116.1 | SUSE-SU-2021:3289-1 |
| SLES 11 SP4 | glibc | 2.11.3-17.110.37.1 | SUSE-SU-2021:14822-1 |
| SLES for SAP 15 SP1 | glibc | 2.26-13.59.1 | SUSE-SU-2021:3385-1 |
| SLES for SAP 15 | glibc | 2.26-13.59.1 | SUSE-SU-2021:3385-1 |
| SLES for SAP 12 SP5 | glibc | 2.22-114.15.1 | SUSE-SU-2021:3290-1 |
| SLES for SAP 12 SP4 | glibc | 2.22-114.15.1 | SUSE-SU-2021:3290-1 |
| SLES for SAP 12 SP3 | glibc | 2.22-116.1 | SUSE-SU-2021:3289-1 |
| SLE Micro 5.1 | glibc | 2.31-9.3.2 | SUSE-SU-2021:3291-1 |
| SLE Micro 5.0 | glibc | 2.26-13.59.1 | SUSE-SU-2021:3385-1 |
| SLE HPC 15 SP1 | glibc | 2.26-13.59.1 | SUSE-SU-2021:3385-1 |
| SLE HPC 15 | glibc | 2.26-13.59.1 | SUSE-SU-2021:3385-1 |
| SUSE OpenStack Cloud Crowbar 9 | glibc | 2.22-114.15.1 | SUSE-SU-2021:3290-1 |
| SUSE OpenStack Cloud Crowbar 8 | glibc | 2.22-116.1 | SUSE-SU-2021:3289-1 |
| SUSE OpenStack Cloud 9 | glibc | 2.22-114.15.1 | SUSE-SU-2021:3290-1 |
| SUSE OpenStack Cloud 8 | glibc | 2.22-116.1 | SUSE-SU-2021:3289-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | glibc | 2.11.3-17.110.37.1 | SUSE-SU-2021:14822-1 |
| SUSE HPE Helion OpenStack 8 | glibc | 2.22-116.1 | SUSE-SU-2021:3289-1 |
| SUSE Enterprise Storage 6 | glibc | 2.26-13.59.1 | SUSE-SU-2021:3385-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | glibc | 2.34-1.2 | openSUSE-SU-2024:10792-1 |
| openSUSE Leap 15.3 | glibc | 2.31-9.3.2 | openSUSE-SU-2021:3291-1 |
| openSUSE Leap 15.2 | glibc +1 | 2.26-lp152.26.9.1 | openSUSE-SU-2021:1374-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | nscd +199 | 2.26-57.amzn2 | ALAS2-2023-2371, ALAS2-2022-1736 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | nscd +211 | 2.28-164.0.1.el8 | ELSA-2021-4358 |
Advisories 21
- ALSA-2021:4358 Moderate: glibc security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:4358 Red Hat Security Advisory: glibc security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- DLA-3152-1 glibc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:4358 Moderate: glibc security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2021:3290-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10792-1 glibc-2.34-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3385-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14822-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3291-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- openSUSE-SU-2021:1374-1 Security update for glibc SUSE / openSUSE Security Updates · May 7, 2025
- openSUSE-SU-2021:3291-1 Security update for glibc SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2021:3289-1 Security update for glibc SUSE / openSUSE Security Updates · May 2, 2025
- SSA-831302 SSA-831302: Vulnerabilities in the BIOS of the SIMATIC S7-1500 TM MFP before V1.3.0 Siemens ProductCERT · Apr 9, 2024
- ICSA-23-166-10 Siemens SIMATIC S7-1500 TM MFP BIOS CISA ICS & IT advisories · Apr 9, 2024
- ALAS2-2023-2371 Moderate: glibc security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 14, 2023
- WID-SEC-2022-1751 GNU libc: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Dec 4, 2023
- WID-SEC-2023-1432 Siemens SIMATIC S7: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 22, 2023
- ALAS2-2022-1736 Low: glibc security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 20, 2022
- ELSA-2021-4358 Moderate: glibc security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 16, 2021
References
- https://sourceware.org/bugzilla/show_bug.cgi?id=27896
- https://sourceware.org/bugzilla/show_bug.cgi?id=27896#c1
- FEDORA-2021-7ddb8b0537 vendor-advisory
- https://security.netapp.com/advisory/ntap-20210629-0005/
- GLSA-202107-07 vendor-advisory
- FEDORA-2021-f29b4643c7 vendor-advisory
- [debian-lts-announce] 20221017 [SECURITY] [DLA 3152-1] glibc security update mailing-list