low
2.1
CWE
20
Advisory Published
CVE Published
Updated

CVE-2015-7872: Input Validation

First published: Fri Oct 16 2015(Updated: )

A vulnerability in the Linux kernel's keyrings garbage collector allowing any local user account to trigger a kernel panic. Problem arrises when using request_key() or keyctl request2. This code sequence tries to invoke an upcall to instantiate a keyring if one doesn't already exist by that name within the user's keyring set. However, if the upcall fails, the code sets keyring->type_data.reject_error to -ENOKEY or some other error code. When the key is garbage collected, the key destroy function is called unconditionally and keyring_destroy() uses list_empty() on keyring->type_data.link - which is in a union with reject_error. Subsequently, the kernel tries to unlink the keyring from the keyring names list, which leads to an oops.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<=4.2.6
Google Android
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.119-1
6.11.10-1
6.12.5-1

Remedy

https://git.kernel.org/linus/1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Remedy

https://git.kernel.org/linus/f05819df10d7b09f6d1eb6f8534a8f68e5a4fe61

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Reference Links

Frequently Asked Questions

  • What is CVE-2015-7872?

    CVE-2015-7872 is a vulnerability in the Linux kernel that allows local users to cause a denial of service (OOPS) via crafted keyctl commands.

  • What is the severity of CVE-2015-7872?

    CVE-2015-7872 has a severity level of high (7 out of 10).

  • How can I fix CVE-2015-7872?

    To fix CVE-2015-7872, you should update your Linux kernel to version 4.3~ or higher.

  • Which Linux kernel versions are affected by CVE-2015-7872?

    Linux kernel versions up to and including 4.2.6 are affected by CVE-2015-7872.

  • Where can I find more information about CVE-2015-7872?

    You can find more information about CVE-2015-7872 on the following websites: [SecurityTracker](http://www.securitytracker.com/id/1034472), [SecurityFocus](http://www.securityfocus.com/bid/77544), [Debian](http://www.debian.org/security/2015/dsa-3396).

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