Bug 1798708 (CVE-2019-20422) - CVE-2019-20422 kernel: mishandling the RT6_LOOKUP_F_DST_NOREF flag in fib6_rule_lookup in net/ipv6/ip6_fib.c
Summary: CVE-2019-20422 kernel: mishandling the RT6_LOOKUP_F_DST_NOREF flag in fib6_ru...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2019-20422
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: 1798709
Blocks: 1798710
TreeView+ depends on / blocked
 
Reported: 2020-02-05 20:04 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-16 20:39 UTC (History)
44 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2020-02-18 20:09:41 UTC
Embargoed:

Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2020-02-05 20:04:19 UTC 
In the Linux kernel before 5.3.4, fib6_rule_lookup in net/ipv6/ip6_fib.c mishandles the RT6_LOOKUP_F_DST_NOREF flag in a reference-count decision, leading to (for example) a crash that was identified by syzkaller.

Reference and upstream commit:
https://github.com/torvalds/linux/commit/7b09c2d052db4b4ad0b27b97918b46a7746966fa
Comment 1 Guilherme de Almeida Suckevicz 2020-02-05 20:06:10 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1798709]
Comment 2 Rohit Keshri 2020-02-06 09:33:01 UTC 
Mitigation:

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Comment 4 Product Security DevOps Team 2020-02-18 20:09:41 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-20422
Comment 7 Eric Christensen 2020-02-21 19:34:55 UTC 
Statement:

The affected code was not introduced into any kernel versions shipped with Red Hat Enterprise Linux making this vulnerable not applicable to these platforms.
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