Date: Fri, 14 Dec 2018 14:15:42 +0100 From: Solar Designer <solar@...nwall.com> To: oss-security@...ts.openwall.com Cc: Jann Horn <jannh@...gle.com> Subject: Re: Linux kernel: userfaultfd bypasses tmpfs file permissions (CVE-2018-18397; since 4.11; fixed in 4.14.87 and 4.19.7) Important correction: On Fri, Dec 14, 2018 at 02:07:55PM +0100, Solar Designer wrote: > > On Wed, 2018-12-12 at 15:24 +0100, Solar Designer wrote: > > > A question to ask may be: out of Linux kernel vulnerabilities being > > > patched, are there more high and critical overall severity (e.g., as > > > risk impact times risk probability) vulnerabilities found in "too > > > recent" kernels than there are high and critical severity untracked > > > vulnerabilities (also or instead) affecting "sufficiently old" kernels? > [...] to answer my question above we need median and not average. Actually, that wouldn't answer this exact question - it'd answer a similar question about tracked vulnerabilities, and the answer would tell us how frequently a vulnerability would need to be patched on a system (apparently, 1/8 of the time for RHEL7 vs. latest mainline now). We can't answer the question about untracked vulnerabilities from per-vulnerability data because untracked implies we lack such data. Alexander
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