SB2026010580 - Multiple vulnerabilities in libpcap

Description

This security bulletin contains information about 2 vulnerabilities.

1) Heap-based buffer overflow (CVE-ID: CVE-2025-11961)

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

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error within the pcap_ether_aton() function in nametoaddr.c. A local privileged user can trigger a heap-based buffer overflow and execute arbitrary code on the target system.

2) Out-of-bounds write (CVE-ID: CVE-2025-11964)

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

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a local user to perform a denial of service attack.

The vulnerability exists due to a boundary error within the utf_16le_to_utf_8_truncated() function in fmtutils.c when converting a Windows error message to UTF-8. A local user can trigger an out-of-bounds write and perform a denial of service attack.

Remediation

Install update from vendor's website.

References

• https://github.com/the-tcpdump-group/libpcap/commit/b2d2f9a9a0581c40780bde509f7cc715920f1c02
• https://github.com/the-tcpdump-group/libpcap/commit/7fabf607f2319a36a0bd78444247180acb838e69