CVE-2017-7472

The KEYS subsystem in the Linux kernel before 4.10.13 allows local users to cause a denial of service (memory consumption) via a series of KEY_REQKEY_DEFL_THREAD_KEYRING keyctl_set_reqkey_keyring calls.

Weakness

The product does not release or incorrectly releases a resource before it is made available for re-use.

Affected Software

Potential Mitigations

• Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
• For example, languages such as Java, Ruby, and Lisp perform automatic garbage collection that releases memory for objects that have been deallocated.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/125.html
• https://cwe.mitre.org/data/definitions/130.html
• https://cwe.mitre.org/data/definitions/131.html
• https://cwe.mitre.org/data/definitions/494.html
• https://cwe.mitre.org/data/definitions/495.html
• https://cwe.mitre.org/data/definitions/496.html
• https://cwe.mitre.org/data/definitions/666.html

References

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c9f838d104fed6f2f61d68164712e3204bf5271b
• http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00007.html
• http://openwall.com/lists/oss-security/2017/05/11/1
• http://www.securityfocus.com/bid/98422
• http://www.securitytracker.com/id/1038471
• https://access.redhat.com/errata/RHSA-2018:0151
• https://access.redhat.com/errata/RHSA-2018:0152
• https://access.redhat.com/errata/RHSA-2018:0181
• https://bugzilla.novell.com/show_bug.cgi?id=1034862
• https://bugzilla.redhat.com/show_bug.cgi?id=1442086
• https://github.com/torvalds/linux/commit/c9f838d104fed6f2f61d68164712e3204bf5271b
• https://lkml.org/lkml/2017/4/1/235
• https://lkml.org/lkml/2017/4/3/724
• https://www.exploit-db.com/exploits/42136/
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.10.13