CVE-2023-5156
Publication date 25 September 2023
Last updated 26 August 2025
Ubuntu priority
Description
A flaw was found in the GNU C Library. A recent fix for CVE-2023-4806 introduced the potential for a memory leak, which may result in an application crash.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| glibc | 25.10 questing |
Fixed 2.38-1ubuntu5
|
| 25.04 plucky |
Fixed 2.38-1ubuntu5
|
|
| 24.04 LTS noble |
Fixed 2.38-1ubuntu5
|
|
| 22.04 LTS jammy |
Fixed 2.35-0ubuntu3.5
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Ignored end of standard support | |
| eglibc | 25.10 questing | Not in release |
| 25.04 plucky | Not in release | |
| 24.04 LTS noble | Not in release | |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty |
Vulnerable, fix deferred
|
Notes
ccdm94
as of 2023-10-19, no releases are vulnerable to this CVE, as the fix for CVE-2023-4806 has not yet been applied to glibc in any of these releases. Whenever CVE-2023-4806 is patched, the patch for CVE-2023-5156 must be included as well in order to avoid regressions and the inclusion of a new vulnerability in glibc. the backports used to patch xenial, bionic and focal for CVE-2023-4806 do not introduce this vulnerability.
Patch details
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.5 · High
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-6541-1
- GNU C Library vulnerabilities
- 7 December 2023