CVE-2021-3612: An out-of-bounds memory write flaw was found in the Linux kernel's joystick devices subsystem in versions before 5.9-rc1, in the way the use
Noroxi assessment
Priority: Monitor (action score 31/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.68% (FIRST EPSS); higher than 52.8% of all records.
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: bpftool (AlmaLinux:8) 4.18.0-372.9.1.el8; kernel (AlmaLinux:8) 4.18.0-372.9.1.el8; kernel-abi-stablelists (AlmaLinux:8) 4.18.0-372.9.1.el8.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to bpftool (AlmaLinux:8) 4.18.0-372.9.1.el8; kernel (AlmaLinux:8) 4.18.0-372.9.1.el8; kernel-abi-stablelists (AlmaLinux:8) 4.18.0-372.9.1.el8 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
An out-of-bounds memory write flaw was found in the Linux kernel's joystick devices subsystem in versions before 5.9-rc1, in the way the user calls ioctl JSIOCSBTNMAP. This flaw allows a local user to crash the system or possibly escalate their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
- BDU:2021-03229
- ALSA-2022:1988
- DLA-2785-1
- DLA-2843-1
- openSUSE-SU-2021:1076-1
- openSUSE-SU-2021:2645-1
- openSUSE-SU-2021:2687-1
- RHSA-2022:1975
- RHSA-2022:1988
- RLSA-2022:1975
- RLSA-2022:1988
- SUSE-SU-2021:2407-1
- SUSE-SU-2021:2408-1
- SUSE-SU-2021:2416-1
- SUSE-SU-2021:2438-1
- SUSE-SU-2021:2599-1
- SUSE-SU-2021:2599-2
- SUSE-SU-2021:2643-1
- SUSE-SU-2021:2645-1
- SUSE-SU-2021:2687-1
- Published
- Jul 9, 2021
- Updated
- Jun 17, 2026
- EPSS
- 0.6% · 52th percentile
- CWE
- CWE-20
Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| oracle | communications cloud native core binding support function | cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function |
| oracle | communications cloud native core network exposure function | cpe:2.3:a:oracle:communications_cloud_native_core_network_exposure_function |
| oracle | communications cloud native core policy | cpe:2.3:a:oracle:communications_cloud_native_core_policy |
| netapp | cloud backup | cpe:2.3:a:netapp:cloud_backup |
| netapp | solidfire baseboard management controller firmware | cpe:2.3:o:netapp:solidfire_baseboard_management_controller_firmware |
| netapp | solidfire baseboard management controller | cpe:2.3:h:netapp:solidfire_baseboard_management_controller |
| netapp | h300s firmware | cpe:2.3:o:netapp:h300s_firmware |
| netapp | h300s | cpe:2.3:h:netapp:h300s |
and 14 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux9.0
- fedoraproject fedora34
- linux linux kernelbefore 5.9.0
- netapp cloud backupall versions
- netapp h300e firmwareall versions
- netapp h300s firmwareall versions
- netapp h410c firmwareall versions
- netapp h410s firmwareall versions
- netapp h500e firmwareall versions
- netapp h500s firmwareall versions
- netapp h700e firmwareall versions
- netapp h700s firmwareall versions
- netapp solidfire baseboard management controller firmwareall versions
- oracle communications cloud native core binding support function22.1.3
- oracle communications cloud native core network exposure function22.1.1
- oracle communications cloud native core policy22.2.0
- redhat enterprise linux7.0
- redhat enterprise linux8.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
n/a kernel
- kernel 5.9-rc1affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | bpftool | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-abi-stablelists | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-core | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-cross-headers | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-debug | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-debug-core | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-debug-devel | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-debug-modules | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-debug-modules-extra | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-devel | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-doc | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-headers | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-modules | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-modules-extra | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-tools | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-tools-libs | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | kernel-tools-libs-devel | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | perf | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| AlmaLinux:8 | python3-perf | before 4.18.0-372.9.1.el8 | 4.18.0-372.9.1.el8 |
| Debian:12 | linux | before 5.10.46-3 | 5.10.46-3 |
| Debian:9 | linux | before 4.9.290-1 | 4.9.290-1 |
| Debian:9 | linux-4.19 | before 4.19.208-1~deb9u1 | 4.19.208-1~deb9u1 |
| openSUSE:Leap 15.2 | kernel-debug | before 5.3.18-lp152.84.1 | 5.3.18-lp152.84.1 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2021-28691Jun 29, 2021 · Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interfac31Monitor
- ← EarlierCVE-2021-35039Jul 6, 2021 · kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification, aka CID-0c18f29aae7c.31Monitor
- Later →CVE-2021-33909Jul 20, 2021 · fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer34Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:bpftool | 4.18.0-372.9.1.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel | 4.18.0-372.9.1.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-abi-stablelists | 4.18.0-372.9.1.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-core | 4.18.0-372.9.1.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-cross-headers | 4.18.0-372.9.1.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug | 4.18.0-372.9.1.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-core | 4.18.0-372.9.1.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-devel | 4.18.0-372.9.1.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-modules | 4.18.0-372.9.1.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-modules-extra | 4.18.0-372.9.1.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-devel | 4.18.0-372.9.1.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-doc | 4.18.0-372.9.1.el8 · AlmaLinux:8 | Package registry (OSV) |
| debian:linux | 5.10.46-3 · Debian:12 | Package registry (OSV) |
| debian:linux-4.19 | 4.19.208-1~deb9u1 · Debian:9 | Package registry (OSV) |
| opensuse:kernel-azure | 5.3.18-38.17.1 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:kernel-debug | 5.3.18-lp152.84.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-default | 5.3.18-lp152.84.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-default-base | 5.3.18-lp152.84.1.lp152.8.38.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-docs | 5.3.18-lp152.84.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 5.3.18-lp152.84.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-obs-build | 5.3.18-lp152.84.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 5.3.18-lp152.84.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-preempt | 5.3.18-lp152.84.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-source | 5.3.18-lp152.84.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-source-azure | 5.3.18-38.17.1 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:kernel-syms | 5.3.18-lp152.84.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| red hat:kernel-rt | 0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-core | 0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug | 0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-core | 0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
+22
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-22-0474 · Jul 4, 2022(RedHat Güvenlik Güncellemesi)
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (6 more)Show less
- lists.debian.org/debian-lts-announce/2021/10/msg00010.html
- lists.debian.org/debian-lts-announce/2021/12/msg00012.html
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YKGI562LFV5MESTMVTCG5RORSBT6NGBN/
- lore.kernel.org/linux-input/20210620120030.1513655-1-avlarkin82%40gmail.com/
- security.netapp.com/advisory/ntap-20210805-0005/
- www.oracle.com/security-alerts/cpujul2022.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.