The do_umount function in fs/namespace.c in the Linux kernel up to and including 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.
Vulnerable Product | Search on Vulmon | Subscribe to Product |
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linux linux kernel |
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canonical ubuntu linux 10.04 |
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canonical ubuntu linux 12.04 |
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canonical ubuntu linux 14.04 |
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canonical ubuntu linux 14.10 |