# RLSA-2023:5455: glibc security update

RLSA-2023:5455, released October 6, 2023, fixes 4 CVEs in glibc (version 0:2.28-225.el8_8.6). One of them is being exploited (CVE-2023-4911); 1 on CISA KEV. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/fix/linux/rlsa-2023-5455
- Platform: Linux
- Released: Oct 6, 2023
- Priority: Patch now (Closes CVE-2023-4911, exploited (CISA KEV))
- CVEs: 4, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://errata.rockylinux.org/RLSA-2023:5455

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [glibc](https://patchblox.com/security/data/product/linux/glibc.md) | rocky 8 | 0:2.28-225.el8_8.6 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-4911](https://patchblox.com/security/data/cve/CVE-2023-4911.md) | Patch now | compat-libpthread-nonshared: The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math librar... | 7.8 | 0.6377 | CISA KEV |
| [CVE-2023-4813](https://patchblox.com/security/data/cve/CVE-2023-4813.md) | High | compat-libpthread-nonshared: The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math librar... | 7.8 | 0.0193 |  |
| [CVE-2023-4527](https://patchblox.com/security/data/cve/CVE-2023-4527.md) | High | Glibc: stack read overflow in getaddrinfo in no-aaaa mode | 7.8 | 0.0167 |  |
| [CVE-2023-4806](https://patchblox.com/security/data/cve/CVE-2023-4806.md) | High | glibc-source: A flaw has been identified in glibc | 7.8 | 0.0161 |  |

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Data as of 2026-11-07T06:34:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo