Bug 2031183 (CVE-2018-25020) - CVE-2018-25020 kernel: long jump over an instruction sequence can lead to overflow in the BPF subsystem
Summary: CVE-2018-25020 kernel: long jump over an instruction sequence can lead to ove...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2018-25020
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: 2031184
Blocks: 2031185
TreeView+ depends on / blocked
 
Reported: 2021-12-10 17:49 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-02-17 08:25 UTC (History)
49 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2021-12-16 22:26:15 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2021-12-10 17:49:45 UTC 
The BPF subsystem in the Linux kernel before 4.17 mishandles situations with a long jump over an instruction sequence where inner instructions require substantial expansions into multiple BPF instructions, leading to an overflow. This affects kernel/bpf/core.c and net/core/filter.c.

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=050fad7c4534c13c8eb1d9c2ba66012e014773cb
Comment 1 Guilherme de Almeida Suckevicz 2021-12-10 17:50:48 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2031184]
Comment 2 Justin M. Forbes 2021-12-13 20:14:53 UTC 
This was fixed in 4.17 upstream so has not impacted Fedora in years.
Comment 4 Product Security DevOps Team 2021-12-16 22:26:10 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-2018-25020
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