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    CVE-2026-101303

    The IPv6 UDP send path for unconnected sockets did not apply the jail policy of rewriting a loopback destination address to the jail's primary IPv6 address. A process in a classic (non-VNET) jail can send UDP datagrams to services listening on the host's IPv6 loopback address, bypassing jail network isolation.

    Published:Oct 15, 2026
    Last Modified:Oct 20, 2026
    EPS:Oct 15, 2026
    EPSS Score:0.00387
    CVSS Score:7.5

    Affected Products

    Vendor
    Freebsd
    Product
    Freebsd

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-101309 (CVSS 7) — The xHCI (USB 3) device model did not validate or save the event ring size provided by the guest. The size wa…
    CVE-2026-101308 (CVSS 5.5) — When an audio channel's buffer needs to be resized, the sound(4) driver checks that the buffer is not memory-m…
    CVE-2026-101307 (CVSS 8.2) — When the PCM sample array needs to grow, the RACK stack doubles a 16-bit allocation counter. Repeated doublin…
    CVE-2026-101302 (CVSS 6.5) — TLS 1.3 embeds the actual record type as the last non-zero byte of the decrypted payload, optionally followed …
    CVE-2026-101306 (CVSS 9.8) — SCM_RIGHTS file descriptor passing did not preserve FD_RESOLVE_BENEATH when a descriptor was transferred. A p…
    CVE-2026-101305 (CVSS 8.8) — renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments. A jailed process could rename a di…
    CVE-2026-101304 (CVSS 7.1) — When fdescfs(4) was mounted in a jail with the "nodup" option, opening /dev/fd/N returned a descriptor that di…
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    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