Bug 2048259 (CVE-2022-0433) - CVE-2022-0433 kernel: missing initialization in bloom filter map in kernel/bpf/bloom_filter.c can lead to DoS
Summary: CVE-2022-0433 kernel: missing initialization in bloom filter map in kernel/bp...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2022-0433
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: 2048262
Blocks: 2039891 2048649
TreeView+ depends on / blocked
 
Reported: 2022-01-30 16:50 UTC by Alex
Modified: 2022-03-09 14:46 UTC (History)
47 users (show)

Fixed In Version: Linux kernel 5.17-rc1
Doc Type: If docs needed, set a value
Doc Text:
A NULL pointer dereference flaw was found in the Linux kernel’s BPF subsystem in the way a user triggers the map_get_next_key function of the BPF bloom filter. This flaw allows a local user to crash the system.
Clone Of:
Environment:
Last Closed: 2022-01-31 14:01:16 UTC
Embargoed:

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Description Alex 2022-01-30 16:50:51 UTC 
The bug inside bloom filter.
Results in Null Pointer Dereference when map_get_next_key function inside BPF code being executed by local user.

This is new (fresh) bloom filter functionality of the eBPF that is actual starting from this commit:
https://lore.kernel.org/bpf/20210921210225.4095056-2-joannekoong@fb.com/

Reference to the patch:
https://lore.kernel.org/bpf/d5776f5d-3416-4e3b-8751-8a5a9e6a0d4d@iogearbox.net/T/
Comment 1 Alex 2022-01-30 17:06:29 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2048262]
Comment 3 juneau 2022-01-31 13:34:03 UTC 
Services notaffected per kernel analysis.
Comment 5 Justin M. Forbes 2022-01-31 22:53:46 UTC 
This bug was introduced in 5.16 kernels and a fix was included in 5.16.3 upstream. It was never shipped as an update to stable Fedora users.
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