SB2026100239 - openEuler 24.03 LTS update for glibc

Description

This security bulletin contains information about 2 vulnerabilities.

1) Heap-based buffer overflow (CVE-ID: CVE-2026-5450)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library with a format width specifier with an explicit width greater than 1024 could result in a one byte heap buffer overflow. A remote attacker can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

2) Buffer under-read (CVE-ID: CVE-2026-5928)

CWE-ID: CWE-127 - Buffer Under-read

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to calling the ungetwc function on a FILE stream with wide characters encoded in a character set that has overlaps between its single byte and multi-byte character encodings, in the GNU C Library may result in an attempt to read bytes before an allocated buffer. A remote attacker can pass specially crafted data to the application, causing disclosure of neighboring data in the heap, or a program crash.

Remediation

Install update from vendor's website.

References

• https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-2411