CVE-2026-120831

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    CVE-2026-120831

    Published: 3 Nov 2026Last Modified: 7 Nov 2026

    Summary: Libslirp: libslirp: queue pointer corruption in if_output() leading to denial of service

    Details: A flaw was found in libslirp in if_output(). When moving a session from the fast queue to the batch queue, the code unlinked and reinserted an arbitrary packet via ifm->m_nextpkt instead of the session queue head, corrupting queue pointers. A guest generating burst traffic could crash the host networking process, causing a denial of service.

    References: https://access.redhat.com/downloads/content/package-browser/, https://access.redhat.com/security/cve/CVE-2026-120831, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/120xxx/CVE-2026-120831.json, https://nvd.nist.gov/vuln/detail/CVE-2026-120831, https://bugzilla.redhat.com/show_bug.cgi?id=2565425, https://gitlab.freedesktop.org/slirp/libslirp/-/commit/bad35bd3b529dc47aa109980a69a36da7848ab76

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -bad35bd3b529dc47aa109980a69a36da7848ab76

    Affected versions

    v4.9.6
    v4.9.5
    v4.9.4
    v4.9.3
    v4.9.2
    v4.9.1
    v4.9.0

    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
    CVE-2026-120831 | CVE-DB