{
  "modified": "2025-08-09T19:01:27Z",
  "published": "2016-02-08T03:59:02Z",
  "id": "CVE-2015-7550",
  "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b4a1b4f5047e4f54e194681125c74c0aa64d637d"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.debian.org/security/2016/dsa-3434"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.4"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.ubuntu.com/usn/USN-2888-1"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.ubuntu.com/usn/USN-2890-1"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.ubuntu.com/usn/USN-2890-2"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.ubuntu.com/usn/USN-2890-3"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.ubuntu.com/usn/USN-2911-1"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.ubuntu.com/usn/USN-2911-2"
    },
    {
      "type": "FIX",
      "url": "https://github.com/torvalds/linux/commit/b4a1b4f5047e4f54e194681125c74c0aa64d637d"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1291197"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/79903"
    },
    {
      "type": "WEB",
      "url": "https://security-tracker.debian.org/tracker/CVE-2015-7550"
    }
  ]
}