SB2026100245 - openEuler 22.03 LTS SP4 update for glibc

Description

This security bulletin contains information about 2 vulnerabilities.

1) Out-of-bounds write (CVE-ID: CVE-2026-5435)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 5.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to  deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library fail to enforce the caller-supplied buffer length, and can result in an out-of-bounds write when printing TSIG records.. A remote attacker can create a specially crafted file, trick the victim into opening it using the affected software, trigger an out-of-bounds write and execute arbitrary code on the target system.

2) Buffer Over-read (CVE-ID: CVE-2026-6238)

CWE-ID: CWE-126 - Buffer over-read

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to crash the target application or read uninitialized data.

The vulnerability exists due to deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.0.1 to version 2.43 fail to validate the RDATA content against the RDATA length in a DNS response when processing A6, CERT, LOC, TKEY or TSIG records. A remote attacker can craft a DNS response, causing a target application to crash or read uninitialized memory.

Remediation

Install update from vendor's website.

References

• https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-2592