CVE-2021-43056: An issue was discovered in the Linux kernel for powerpc before 5.14.15.
Noroxi assessment
Priority: Monitor (action score 22/100)
- 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: 0.36% (FIRST EPSS).
- 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: linux (Debian:12) 5.14.16-1; kernel-debug (openSUSE:Leap 15.2) 5.3.18-lp152.102.1; kernel-default (openSUSE:Leap 15.2) 5.3.18-lp152.102.1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to linux (Debian:12) 5.14.16-1; kernel-debug (openSUSE:Leap 15.2) 5.3.18-lp152.102.1; kernel-default (openSUSE:Leap 15.2) 5.3.18-lp152.102.1 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 issue was discovered in the Linux kernel for powerpc before 5.14.15. It allows a malicious KVM guest to crash the host, when the host is running on Power8, due to an arch/powerpc/kvm/book3s_hv_rmhandlers.S implementation bug in the handling of the SRR1 register values.
- BDU:2021-05741
- openSUSE-SU-2021:1477-1
- openSUSE-SU-2021:3641-1
- openSUSE-SU-2021:3675-1
- SUSE-SU-2021:3640-1
- SUSE-SU-2021:3641-1
- SUSE-SU-2021:3642-1
- SUSE-SU-2021:3658-1
- SUSE-SU-2021:3675-1
- SUSE-SU-2021:3754-1
- SUSE-SU-2024:2008-1
- SUSE-SU-2024:2010-1
- SUSE-SU-2024:2183-1
- SUSE-SU-2024:2185-1
- SUSE-SU-2024:2189-1
- Published
- Oct 28, 2021
- Updated
- Jun 17, 2026
- EPSS
- 0.3% · 31th percentile
- CWE
- —
Report tools
Action score
22
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
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.
Is your version affected? Check itNoroxi 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 |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- fedoraproject fedora33
- fedoraproject fedora34
- fedoraproject fedora35
- linux linux kernel5.2 and later · before 5.4.15
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 5.14.16-1 | 5.14.16-1 |
| openSUSE:Leap 15.2 | kernel-debug | before 5.3.18-lp152.102.1 | 5.3.18-lp152.102.1 |
| openSUSE:Leap 15.2 | kernel-default | before 5.3.18-lp152.102.1 | 5.3.18-lp152.102.1 |
| openSUSE:Leap 15.2 | kernel-default-base | before 5.3.18-lp152.102.1.lp152.8.49.1 | 5.3.18-lp152.102.1.lp152.8.49.1 |
| openSUSE:Leap 15.2 | kernel-docs | before 5.3.18-lp152.102.1 | 5.3.18-lp152.102.1 |
| openSUSE:Leap 15.2 | kernel-kvmsmall | before 5.3.18-lp152.102.1 | 5.3.18-lp152.102.1 |
| openSUSE:Leap 15.2 | kernel-obs-build | before 5.3.18-lp152.102.1 | 5.3.18-lp152.102.1 |
| openSUSE:Leap 15.2 | kernel-obs-qa | before 5.3.18-lp152.102.1 | 5.3.18-lp152.102.1 |
| openSUSE:Leap 15.2 | kernel-preempt | before 5.3.18-lp152.102.1 | 5.3.18-lp152.102.1 |
| openSUSE:Leap 15.2 | kernel-source | before 5.3.18-lp152.102.1 | 5.3.18-lp152.102.1 |
| openSUSE:Leap 15.2 | kernel-syms | before 5.3.18-lp152.102.1 | 5.3.18-lp152.102.1 |
| openSUSE:Leap 15.3 | dtb-aarch64 | before 5.3.18-59.34.1 | 5.3.18-59.34.1 |
| openSUSE:Leap 15.3 | kernel-64kb | before 5.3.18-59.34.1 | 5.3.18-59.34.1 |
| openSUSE:Leap 15.3 | kernel-azure | before 5.3.18-38.28.2 | 5.3.18-38.28.2 |
| openSUSE:Leap 15.3 | kernel-debug | before 5.3.18-59.34.1 | 5.3.18-59.34.1 |
| openSUSE:Leap 15.3 | kernel-default | before 5.3.18-59.34.1 | 5.3.18-59.34.1 |
| openSUSE:Leap 15.3 | kernel-default-base | before 5.3.18-59.34.1.18.21.1 | 5.3.18-59.34.1.18.21.1 |
| openSUSE:Leap 15.3 | kernel-docs | before 5.3.18-59.34.1 | 5.3.18-59.34.1 |
| openSUSE:Leap 15.3 | kernel-kvmsmall | before 5.3.18-59.34.1 | 5.3.18-59.34.1 |
| openSUSE:Leap 15.3 | kernel-obs-build | before 5.3.18-59.34.1 | 5.3.18-59.34.1 |
| openSUSE:Leap 15.3 | kernel-obs-qa | before 5.3.18-59.34.1 | 5.3.18-59.34.1 |
| openSUSE:Leap 15.3 | kernel-preempt | before 5.3.18-59.34.1 | 5.3.18-59.34.1 |
| openSUSE:Leap 15.3 | kernel-source | before 5.3.18-59.34.1 | 5.3.18-59.34.1 |
| openSUSE:Leap 15.3 | kernel-source-azure | before 5.3.18-38.28.2 | 5.3.18-38.28.2 |
+75
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-2021-42739Oct 20, 2021 · The firewire subsystem in the Linux kernel through 5.14.13 has a buffer overflow related to drivers/media/firewire/firedtv-avc.c and…26Monitor
- ← EarlierCVE-2021-42327Oct 21, 2021 · dp_link_settings_write in drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c in the Linux kernel through 5.14.14 allows a heap-based…26Monitor
- Later →CVE-2021-43057Oct 28, 2021 · An issue was discovered in the Linux kernel before 5.14.8.31Monitor
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 |
|---|---|---|
| debian:linux | 5.14.16-1 · Debian:12 | Package registry (OSV) |
| opensuse:kernel-debug | 5.3.18-lp152.102.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-default | 5.14.21-150400.24.122.2 · openSUSE:Leap Micro 5.3 | Package registry (OSV) |
| opensuse:kernel-default-base | 5.14.21-150400.24.122.2.150400.24.58.2 · openSUSE:Leap Micro 5.3 | Package registry (OSV) |
| opensuse:kernel-docs | 5.3.18-lp152.102.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 5.3.18-lp152.102.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-obs-build | 5.3.18-lp152.102.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 5.3.18-lp152.102.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-preempt | 5.3.18-lp152.102.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:kernel-rt | 5.14.21-150500.13.58.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-rt_debug | 5.14.21-150500.13.58.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-source-rt | 5.14.21-150500.13.58.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-syms-rt | 5.14.21-150500.13.58.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| suse:kernel-64kb | 5.3.18-59.34.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP3 | Package registry (OSV) |
| suse:kernel-azure | 5.3.18-18.72.2 · SUSE:Linux Enterprise Module for Public Cloud 15 SP2 | Package registry (OSV) |
| suse:kernel-default | 5.14.21-150400.24.122.2 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-default | 5.3.18-59.34.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP3 | Package registry (OSV) |
| suse:kernel-default-base | 5.14.21-150400.24.122.2.150400.24.58.2 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-default-base | 5.3.18-59.34.1.18.21.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP3 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP4_Update_27 | 1-150400.9.3.2 · SUSE:Linux Enterprise Live Patching 15 SP4 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP5-RT_Update_16 | 1-150500.11.3.1 · SUSE:Linux Enterprise Live Patching 15 SP5 | Package registry (OSV) |
| suse:kernel-preempt | 5.3.18-59.34.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP3 | Package registry (OSV) |
| suse:kernel-rt | 5.14.21-150500.13.58.1 · SUSE:Linux Enterprise Micro 5.5 | Package registry (OSV) |
| suse:kernel-rt | 5.3.18-60.1 · SUSE:Real Time Module 15 SP3 | Package registry (OSV) |
| suse:kernel-rt_debug | 5.14.21-150500.13.58.1 · SUSE:Real Time Module 15 SP5 | Package registry (OSV) |
| suse:kernel-rt_debug | 5.3.18-60.1 · SUSE:Real Time Module 15 SP3 | Package registry (OSV) |
| suse:kernel-source | 5.3.18-59.34.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP3 | Package registry (OSV) |
| suse:kernel-source-azure | 5.3.18-18.72.2 · SUSE:Linux Enterprise Module for Public Cloud 15 SP2 | Package registry (OSV) |
| suse:kernel-source-rt | 5.14.21-150500.13.58.1 · SUSE:Linux Enterprise Micro 5.5 | Package registry (OSV) |
| suse:kernel-source-rt | 5.3.18-60.1 · SUSE:Real Time Module 15 SP3 | Package registry (OSV) |
+3
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.
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)
Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
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
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (6 more)Show less
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15
- git.kernel.org/linus/cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AA7EAPPKWG4LMTQQLNNSKATY6ST2KQFE/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBM4FP3IT3JZ2O7EBS7TEOG657N4ZGRE/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRAIS3PG4EV5WFLYESR6FXWM4BJJGWVA/
- lore.kernel.org/linuxppc-dev/87pmrtbbdt.fsf%40mpe.ellerman.id.au/T/#u
Vendor advisories and official records. Exploit/PoC links are deliberately left out.