|Summary:||CVE-2015-4178 kernel: list corruption of m_list or s_list if unused|
|Product:||[Other] Security Response||Reporter:||Wade Mealing <wmealing>|
|Component:||vulnerability||Assignee:||Red Hat Product Security <security-response-team>|
|Status:||CLOSED NOTABUG||QA Contact:|
|Version:||unspecified||CC:||agordeev, aquini, arm-mgr, bhu, dhoward, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, plougher, rt-maint, rvrbovsk, slawomir, slong, williams|
|Fixed In Version:||Doc Type:||Bug Fix|
A flaw was found in the Linux kernel which is related to the user namespace lazily unmounting file systems. The fs_pin struct has two members (m_list and s_list) which are usually initialized on use in the pin_insert_group function. However, these members might go unmodified; in this case, the system panics when it attempts to destroy or free them. This flaw could be used to launch a denial-of-service attack.
|Last Closed:||2017-01-20 02:00:05 UTC||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
|Cloudforms Team:||---||Target Upstream Version:|
|Bug Depends On:|
Description Wade Mealing 2015-08-04 00:49:32 UTC
A flaw was found in the linux kernel related to the user namespace lazily unmounting filesystems. The fs_pin struct had two members (m_list and s_list) which are usually initialized on use in the pin_insert_group function. It is possible that these lists go unmodified and are then attempted to be destroyed/freed panicing the system. Upstream patch: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=820f9f147dcce2602eefd9b575bbbd9ea14f0953 CVE Request: http://seclists.org/oss-sec/2015/q2/640
Comment 1 Wade Mealing 2015-08-20 03:53:33 UTC
Statement: This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 5, 6, 7, MRG-2, realtime and arm-kernels.