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    CVE-2017-5551

    The simple_set_acl function in fs/posix_acl.c in the Linux kernel before 4.9.6 preserves the setgid bit during a setxattr call involving a tmpfs filesystem, which allows local users to gain group privileges by leveraging the existence of a setgid program with restrictions on execute permissions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-7097.

    Published:Jan 9, 2017
    Last Modified:Apr 20, 2025
    EPS:Feb 6, 2017
    EPSS Score:0.00064
    CVSS Score:4.4

    Affected Products

    Vendor
    Linux
    Product
    Linux Kernel
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Mrg
    Vendor
    Redhat
    Product
    Rhel Extras Rt

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-287 Improper Authentication

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    References

    http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=497de07d89c1410d76a15bec2bb41f24a2a89f31
    http://www.debian.org/security/2017/dsa-3791
    http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.6
    http://www.openwall.com/lists/oss-security/2017/01/21/3
    http://www.securityfocus.com/bid/95717
    http://www.securitytracker.com/id/1038053
    https://bugzilla.redhat.com/show_bug.cgi?id=1416126
    https://github.com/torvalds/linux/commit/497de07d89c1410d76a15bec2bb41f24a2a89f31
    http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=497de07d89c1410d76a15bec2bb41f24a2a89f31
    http://www.debian.org/security/2017/dsa-3791
    http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.6
    http://www.openwall.com/lists/oss-security/2017/01/21/3
    http://www.securityfocus.com/bid/95717
    http://www.securitytracker.com/id/1038053
    https://bugzilla.redhat.com/show_bug.cgi?id=1416126
    https://github.com/torvalds/linux/commit/497de07d89c1410d76a15bec2bb41f24a2a89f31

    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