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    CVE-2026-6554

    libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations. A crafted filter program or the 'protochain' primitive used on a crafted network packet can cause the interpreter to loop infinitely.

    Published:Sep 5, 2026
    Last Modified:Oct 23, 2026
    EPS:Sep 5, 2026
    EPSS Score:0.00105
    CVSS Score:7.5

    Affected Products

    Vendor
    Tcpdump
    Product
    Libpcap

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-6244 (CVSS 5.5) — libpcap BPF interpreter for the 'div #k' and 'mod #k' ALU instructions does not check whether the immediate va…
    CVE-2026-31911 (CVSS 5.5) — libpcap BPF interpreter calls abort() if it encounters a BPF instruction that has an invalid opcode. In parti…
    CVE-2026-31912 (CVSS 5.5) — libpcap BPF interpreter detects neither reaching the end of the filter program buffer due to lack of a return …
    CVE-2026-0799 (CVSS 8.7) — In BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigne…
    CVE-2025-11964 (CVSS 1.9) — On Windows only, if libpcap needs to convert a Windows error message to UTF-8 and the message includes charact…
    CVE-2025-11961 (CVSS 1.9) — pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size all…
    CVE-2024-8006 (CVSS 4.4) — Remote packet capture support is disabled by default in libpcap. When a user builds libpcap with remote packe…
    CVE-2023-7256 (CVSS 4.4) — In affected libpcap versions during the setup of a remote packet capture the internal function sock_initaddres…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High