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Ubuntu 25.10 GNU C Library Critical Denial of Service CVE-2025-15281

ubuntu
Calendar Grey February 4, 2026
Dist Ubuntu Esm H88
Explore the recent Ubuntu security advisory addressing critical glibc issues with potential denial of service impacts.
Several security issues were fixed in GNU C Library.

Summary

Several security issues were fixed in GNU C Library.

Software Description:

- glibc: GNU C Library

Details:

Vitaly Simonovich discovered that the GNU C Library did not properly

initialize the input when WRDE_REUSE is used. An attacker could possibly

use this issue to cause applications to crash, leading to a denial of

service. (CVE-2025-15281)

Anastasia Belova discovered that the GNU C Library incorrectly handled

the regcomp function when memory allocation failures occured. An attacker

could possibly use this issue to cause applications to crash, leading to

a denial of service, or possibly execute arbitrary code. This issue only

affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.

(CVE-2025-8058)

Igor Morgenstern discovered that the GNU C Library incorrectly handled

the memalign function when doing memory allocation. An attacker could

possibly use this issue to cause applications to crash, leading to a

denial of service, or possibly execute arbitrary code. This iss...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu glibc patching

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
  libc6                           2.42-0ubuntu3.1
  nscd                            2.42-0ubuntu3.1

Ubuntu 24.04 LTS
  libc6                           2.39-0ubuntu8.7
  nscd                            2.39-0ubuntu8.7

Ubuntu 22.04 LTS
  libc6                           2.35-0ubuntu3.13
  nscd                            2.35-0ubuntu3.13

Ubuntu 20.04 LTS
  libc6                           2.31-0ubuntu9.18+esm1
                                  Available with Ubuntu Pro
  nscd                            2.31-0ubuntu9.18+esm1
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libc6                           2.27-3ubuntu1.6+esm6
                                  Available with Ubuntu Pro
  nscd                            2.27-3ubuntu1.6+esm6
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  libc6                           2.23-0ubuntu11.3+esm9
                                  Available with Ubuntu Pro
  nscd                            2.23-0ubuntu11.3+esm9
                                  Available with Ubuntu Pro

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8005-1

CVE-2025-15281, CVE-2025-8058, CVE-2026-0861, CVE-2026-0915

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8005-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu glibc patching

Package Information

https://launchpad.net/ubuntu/+source/glibc/2.42-0ubuntu3.1
https://launchpad.net/ubuntu/+source/glibc/2.39-0ubuntu8.7
https://launchpad.net/ubuntu/+source/glibc/2.35-0ubuntu3.13

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