HOMEVULNERABILITIESCVE-2021-3743
HIGH

CVE-2021-3743

CWE-125Published: March 4, 2022· Updated: Jun 17, 2026

7.1
CVSS v3.1

Official Description

An out-of-bounds (OOB) memory read flaw was found in the Qualcomm IPC router protocol in the Linux kernel. A missing sanity check allows a local attacker to gain access to out-of-bounds memory, leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability.

NVD Source

Technical Analysis

CVE-2021-3743 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 7.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected Vendors & Products

Fedora1 product(s)
fedora
Linux1 product(s)
linux kernel
netapp16 product(s)
h300s firmwareh300sh500s firmwareh500sh700s firmwareh700sh300e firmwareh300eh500e firmwareh500eh700e firmwareh700e+4
Oracle3 product(s)
communications cloud native core binding support functioncommunications cloud native core network exposure functioncommunications cloud native core policy
Source: NVD CPE · 23 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1997961
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=7e78c597c3eb
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7e78c597c3ebfd0cb329aa09a838734147e4f117
PATCHhttps://github.com/torvalds/linux/commit/7e78c597c3ebfd0cb329aa09a838734147e4f117
PATCHhttps://www.openwall.com/lists/oss-security/2021/08/27/2
PATCHhttps://www.oracle.com/security-alerts/cpujul2022.html
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1997961
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=7e78c597c3eb
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7e78c597c3ebfd0cb329aa09a838734147e4f117
PATCHhttps://github.com/torvalds/linux/commit/7e78c597c3ebfd0cb329aa09a838734147e4f117
PATCHhttps://www.openwall.com/lists/oss-security/2021/08/27/2
PATCHhttps://www.oracle.com/security-alerts/cpujul2022.html
ADVISORYhttps://lists.openwall.net/netdev/2021/08/17/124
ADVISORYhttps://security.netapp.com/advisory/ntap-20220407-0007/
ADVISORYhttps://lists.openwall.net/netdev/2021/08/17/124
ADVISORYhttps://security.netapp.com/advisory/ntap-20220407-0007/

All References (16)

→
https://bugzilla.redhat.com/show_bug.cgi?id=1997961Issue Tracking · Patch · Third Party Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=7e78c597c3ebPatch · Vendor Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7e78c597c3ebfd0cb329aa09a838734147e4f117Patch · Vendor Advisory
→
https://github.com/torvalds/linux/commit/7e78c597c3ebfd0cb329aa09a838734147e4f117Patch · Third Party Advisory
→
https://lists.openwall.net/netdev/2021/08/17/124Exploit · Mailing List · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20220407-0007/Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2021/08/27/2Exploit · Mailing List · Patch · Third Party Advisory
→
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1997961Issue Tracking · Patch · Third Party Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=7e78c597c3ebPatch · Vendor Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7e78c597c3ebfd0cb329aa09a838734147e4f117Patch · Vendor Advisory
→
https://github.com/torvalds/linux/commit/7e78c597c3ebfd0cb329aa09a838734147e4f117Patch · Third Party Advisory
→
https://lists.openwall.net/netdev/2021/08/17/124Exploit · Mailing List · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20220407-0007/Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2021/08/27/2Exploit · Mailing List · Patch · Third Party Advisory

Quick Facts

CVE IDCVE-2021-3743
CVSS Score7.1 / 10
SeverityHIGH
WeaknessCWE-125
CISA KEVNo
Affected4 vendor(s)
PublishedMar 4, 2022

Related CVEs (CWE-125)

CVE-2021-21777
10.0
CVE-2017-14451
10.0
CVE-2009-2523
10.0
CVE-2013-0767
10.0
CVE-2021-41556
10.0
CVE-2026-34987
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-3743 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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