Bug 1752081 (CVE-2019-15902) - CVE-2019-15902 kernel: backporting error in ptrace_get_debugreg()
Summary: CVE-2019-15902 kernel: backporting error in ptrace_get_debugreg()
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2019-15902
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1752085
Blocks: Embargoed1752084
TreeView+ depends on / blocked
 
Reported: 2019-09-13 16:45 UTC by Dhananjay Arunesh
Modified: 2019-09-17 13:40 UTC (History)
45 users (show)

Fixed In Version:
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Last Closed: 2019-09-17 13:39:17 UTC

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Description Dhananjay Arunesh 2019-09-13 16:45:12 UTC 
A backporting error was discovered in the Linux stable/longterm kernel. Misuse of the upstream "x86/ptrace: Fix possible spectre-v1 in ptrace_get_debugreg()" commit reintroduced the Spectre vulnerability that it aimed to eliminate. This occurred because the backport process depends on cherry picking specific commits, and because two (correctly ordered) code lines were swapped.

Reference:
https://grsecurity.net/teardown_of_a_failed_linux_lts_spectre_fix.php
Comment 1 Dhananjay Arunesh 2019-09-13 16:48:16 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1752085]
Comment 2 Justin M. Forbes 2019-09-16 12:18:31 UTC 
This is fixed for Fedora with the 5.2.12 stable kernel updates.
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