MGASA-2014-0479

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MGASA-2014-0479

Summary: Updated kernel-vserver packages fix security vulnerabilities

Details: This kernel-vserver update is based on upstream -longterm 3.10.58 and fixes the following security issues: The kvm_iommu_map_pages function in virt/kvm/iommu.c in the Linux kernel through 3.16.1 miscalculates the number of pages during the handling of a mapping failure, which allows guest OS users to (1) cause a denial of service (host OS memory corruption) or possibly have unspecified other impact by triggering a large gfn value or (2) cause a denial of service (host OS memory consumption) by triggering a small gfn value that leads to permanently pinned pages (CVE-2014-3601). The assoc_array_gc function in the associative-array implementation in lib/assoc_array.c in the Linux kernel before 3.16.3 does not properly implement garbage collection, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via multiple "keyctl newring" operations followed by a "keyctl timeout" operation (CVE-2014-3631). The pivot_root implementation in fs/namespace.c in the Linux kernel through 3.17 does not properly interact with certain locations of a chroot directory, which allows local users to cause a denial of service (mount-tree loop) via . (dot) values in both arguments to the pivot_root system call (CVE-2014-7970). The do_umount function in fs/namespace.c in the Linux kernel through 3.17 does not require the CAP_SYS_ADMIN capability for do_remount_sb calls that change the root filesystem to read-only, which allows local users to cause a denial of service (loss of writability) by making certain unshare system calls, clearing the / MNT_LOCKED flag, and making an MNT_FORCE umount system call (CVE-2014-7975). For other fixes included in this update, read the referenced changelogs.

References: https://advisories.mageia.org/MGASA-2014-0479.html, https://bugs.mageia.org/show_bug.cgi?id=14309, https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.10.52, https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.10.53, https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.10.54, https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.10.55, https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.10.56, https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.10.57, https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.10.58