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Bug 1620555 - (CVE-2018-15594) CVE-2018-15594 kernel: Mishandling of indirect calls weakens Spectre mitigation for paravirtual guests
CVE-2018-15594 kernel: Mishandling of indirect calls weakens Spectre mitigati...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180803,repor...
: Security
Depends On: 1620558 1626416 1626417 1626418 1626419 1626420 1620557
Blocks: 1620559
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Reported: 2018-08-23 03:32 EDT by Andrej Nemec
Modified: 2018-09-07 05:45 EDT (History)
44 users (show)

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Doc Text:
It was found that paravirt_patch_call/jump() functions in the arch/x86/kernel/paravirt.c in the Linux kernel mishandles certain indirect calls, which makes it easier for attackers to conduct Spectre-v2 attacks against paravirtualized guests.
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Description Andrej Nemec 2018-08-23 03:32:28 EDT 
It was found that arch/x86/kernel/paravirt.c in the Linux kernel before 4.18.1 It was found that paravirt_patch_call/jump() functions in the arch/x86/kernel/paravirt.c in the Linux kernel mishandle certain indirect calls, which makes it easier for attackers to conduct Spectre-v2 attacks against paravirtualized guests.

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5800dc5c19f34e6e03b5adab1282535cb102fafd
Comment 1 Andrej Nemec 2018-08-23 03:33:52 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1620557]
Comment 3 Justin M. Forbes 2018-08-23 07:51:04 EDT 
This was fixed for Fedora users with the 4.17.14-202 kernel update.
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