Bug 2010463 (CVE-2021-41864)

Summary: CVE-2021-41864 kernel: eBPF multiplication integer overflow in prealloc_elems_and_freelist() in kernel/bpf/stackmap.c leads to out-of-bounds write
Product: [Other] Security Response Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: acaringi, adscvr, airlied, alciregi, bdettelb, bhu, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarod, jarodwilson, jburrell, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, nmurray, ptalbert, qzhao, rkeshri, rvrbovsk, steved, vkumar, walters, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
An out-of-bounds (OOB) memory write flaw was found in prealloc_elems_and_freelist in kernel/bpf/stackmap.c in the bpf in the Linux kernel. In this flaw, the multiplication to calculate the size could lead to an integer overflow which could allow a local attacker, with a special user privilege, to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2022-05-11 10:45:28 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2010464, 2010490, 2010491, 2010492, 2010493, 2010494    
Bug Blocks: 2010465    

Description Guilherme de Almeida Suckevicz 2021-10-04 17:42:20 UTC 
An out-of-bounds (OOB) memory write flaw was found in prealloc_elems_and_freelist in  kernel/bpf/stackmap.c in the bpf iin the Linux kernel. In this flaw, the multiplication to calculate the size could lead to an integer overflow, and this could allow a local attacker, with a special user privilege to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information.

Reference and upstream patch:
https://github.com/torvalds/linux/commit/30e29a9a2bc6a4888335a6ede968b75cd329657a
Comment 1 Guilherme de Almeida Suckevicz 2021-10-04 17:43:04 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2010464]
Comment 8 errata-xmlrpc 2022-05-10 14:39:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1975 https://access.redhat.com/errata/RHSA-2022:1975
Comment 9 errata-xmlrpc 2022-05-10 14:45:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1988 https://access.redhat.com/errata/RHSA-2022:1988
Comment 10 Product Security DevOps Team 2022-05-11 10:45:24 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-2021-41864