CVE-2015-7550

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    CVE-2015-7550

    Published: 8 Feb 2016Last Modified: 16 Apr 2026

    Summary:

    Details: The keyctl_read_key function in security/keys/keyctl.c in the Linux kernel before 4.3.4 does not properly use a semaphore, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a crafted application that leverages a race condition between keyctl_revoke and keyctl_read calls.

    References: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b4a1b4f5047e4f54e194681125c74c0aa64d637d, http://www.debian.org/security/2016/dsa-3434, http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.4, http://www.ubuntu.com/usn/USN-2888-1, http://www.ubuntu.com/usn/USN-2890-1, http://www.ubuntu.com/usn/USN-2890-2, http://www.ubuntu.com/usn/USN-2890-3, http://www.ubuntu.com/usn/USN-2911-1, http://www.ubuntu.com/usn/USN-2911-2, https://github.com/torvalds/linux/commit/b4a1b4f5047e4f54e194681125c74c0aa64d637d, https://bugzilla.redhat.com/show_bug.cgi?id=1291197, http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html, http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html, http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html, http://www.securityfocus.com/bid/79903, https://security-tracker.debian.org/tracker/CVE-2015-7550

    Affected packages

    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