CVE-2020-36691: An issue was discovered in the Linux kernel before 5.8.
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: 0.23% (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) 5.8.7-1; dtb-aarch64 (openSUSE:Leap 15.4) 5.3.18-150300.59.121.1; kernel-debug (openSUSE:Leap 15.4) 4.12.14-150100.197.145.1.
Low priority for now. Upgrade to linux (Debian:12) 5.8.7-1; dtb-aarch64 (openSUSE:Leap 15.4) 5.3.18-150300.59.121.1; kernel-debug (openSUSE:Leap 15.4) 4.12.14-150100.197.145.1 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 before 5.8. lib/nlattr.c allows attackers to cause a denial of service (unbounded recursion) via a nested Netlink policy with a back reference.
- Published
- Mar 24, 2023
- Updated
- Jun 16, 2026
- EPSS
- 0.2% · 14th percentile
- CWE
- CWE-674
Report tools
Action score
22
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
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 |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernelbefore 5.8
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 5.8.7-1 | 5.8.7-1 |
| openSUSE:Leap 15.4 | dtb-aarch64 | before 5.3.18-150300.59.121.1 | 5.3.18-150300.59.121.1 |
| openSUSE:Leap 15.4 | kernel-debug | before 4.12.14-150100.197.145.1 | 4.12.14-150100.197.145.1 |
| openSUSE:Leap 15.4 | kernel-default | before 4.12.14-150100.197.145.1 | 4.12.14-150100.197.145.1 |
| openSUSE:Leap 15.4 | kernel-kvmsmall | before 4.12.14-150100.197.145.1 | 4.12.14-150100.197.145.1 |
| openSUSE:Leap 15.4 | kernel-vanilla | before 4.12.14-150100.197.145.1 | 4.12.14-150100.197.145.1 |
| openSUSE:Leap 15.4 | kernel-zfcpdump | before 4.12.14-150100.197.145.1 | 4.12.14-150100.197.145.1 |
| SUSE:Linux Enterprise High Availability Extension 12 SP4 | drbd | before 9.0.14+git.62f906cf-4.26.2 | 9.0.14+git.62f906cf-4.26.2 |
| SUSE:Linux Enterprise High Availability Extension 12 SP5 | kernel-default | before 4.12.14-122.159.1 | 4.12.14-122.159.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | kernel-docs | before 4.12.14-150100.197.145.1 | 4.12.14-150100.197.145.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | kernel-obs-build | before 4.12.14-150100.197.145.1 | 4.12.14-150100.197.145.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | kernel-source | before 4.12.14-150100.197.145.1 | 4.12.14-150100.197.145.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | kernel-syms | before 4.12.14-150100.197.145.1 | 4.12.14-150100.197.145.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | kernel-default-base | before 5.3.18-150200.24.151.1.150200.9.73.1 | 5.3.18-150200.24.151.1.150200.9.73.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | kernel-docs | before 5.3.18-150200.24.151.1 | 5.3.18-150200.24.151.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | kernel-obs-build | before 5.3.18-150200.24.151.1 | 5.3.18-150200.24.151.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | kernel-preempt | before 5.3.18-150200.24.151.1 | 5.3.18-150200.24.151.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | kernel-source | before 5.3.18-150200.24.151.1 | 5.3.18-150200.24.151.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | kernel-syms | before 5.3.18-150200.24.151.1 | 5.3.18-150200.24.151.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS | kernel-64kb | before 5.3.18-150300.59.121.2 | 5.3.18-150300.59.121.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS | kernel-default-base | before 5.3.18-150300.59.121.2.150300.18.70.2 | 5.3.18-150300.59.121.2.150300.18.70.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS | kernel-docs | before 5.3.18-150300.59.121.2 | 5.3.18-150300.59.121.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS | kernel-obs-build | before 5.3.18-150300.59.121.2 | 5.3.18-150300.59.121.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS | kernel-preempt | before 5.3.18-150300.59.121.2 | 5.3.18-150300.59.121.2 |
+30
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-2023-1513Mar 23, 2023 · A flaw was found in KVM.13Monitor
- ← EarlierCVE-2023-0590Mar 23, 2023 · A use-after-free flaw was found in qdisc_graft in net/sched/sch_api.c in the Linux Kernel due to a race problem.18Monitor
- Later →CVE-2023-1583Mar 24, 2023 · A NULL pointer dereference was found in io_file_bitmap_get in io_uring/filetable.c in the io_uring sub-component in the Linux Kernel.22Monitor
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 | 5.8.7-1 · Debian:12 | Package registry (OSV) |
| opensuse:dtb-aarch64 | 5.3.18-150300.59.121.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:kernel-debug | 4.12.14-150100.197.145.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:kernel-default | 4.12.14-150100.197.145.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 4.12.14-150100.197.145.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:kernel-vanilla | 4.12.14-150100.197.145.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:kernel-zfcpdump | 4.12.14-150100.197.145.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| suse:kernel-64kb | 5.3.18-150300.59.121.2 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS | Package registry (OSV) |
| suse:kernel-default | 5.3.18-150200.24.151.1 · SUSE:Linux Enterprise Live Patching 15 SP2 | Package registry (OSV) |
| suse:kernel-default | 5.3.18-150300.59.121.2 · SUSE:Linux Enterprise Live Patching 15 SP3 | Package registry (OSV) |
| suse:kernel-default-base | 5.3.18-150200.24.151.1.150200.9.73.1 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | Package registry (OSV) |
| suse:kernel-default-base | 5.3.18-150300.59.121.2.150300.18.70.2 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS | Package registry (OSV) |
| suse:kernel-docs | 5.3.18-150200.24.151.1 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | Package registry (OSV) |
| suse:kernel-docs | 5.3.18-150300.59.121.2 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP1_Update_40 | 1-150100.3.3.1 · SUSE:Linux Enterprise Live Patching 15 SP1 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP2_Update_36 | 1-150200.5.3.1 · SUSE:Linux Enterprise Live Patching 15 SP2 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP3_Update_32 | 1-150300.7.3.2 · SUSE:Linux Enterprise Live Patching 15 SP3 | Package registry (OSV) |
| suse:kernel-obs-build | 5.3.18-150200.24.151.1 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | Package registry (OSV) |
| suse:kernel-obs-build | 5.3.18-150300.59.121.2 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS | Package registry (OSV) |
| suse:kernel-preempt | 5.3.18-150200.24.151.1 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | Package registry (OSV) |
| suse:kernel-preempt | 5.3.18-150300.59.121.2 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS | Package registry (OSV) |
| suse:kernel-rt | 4.12.14-10.121.1 · SUSE:Linux Enterprise Real Time 12 SP5 | Package registry (OSV) |
| suse:kernel-rt_debug | 4.12.14-10.121.1 · SUSE:Linux Enterprise Real Time 12 SP5 | Package registry (OSV) |
| suse:kernel-source | 5.3.18-150200.24.151.1 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | Package registry (OSV) |
| suse:kernel-source | 5.3.18-150300.59.121.2 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS | Package registry (OSV) |
| suse:kernel-source-rt | 4.12.14-10.121.1 · SUSE:Linux Enterprise Real Time 12 SP5 | Package registry (OSV) |
| suse:kernel-syms | 5.3.18-150200.24.151.1 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | Package registry (OSV) |
| suse:kernel-syms | 5.3.18-150300.59.121.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS | Package registry (OSV) |
| suse:kernel-syms-rt | 4.12.14-10.121.1 · SUSE:Linux Enterprise Real Time 12 SP5 | Package registry (OSV) |
| suse:kernel-zfcpdump | 5.3.18-150300.59.121.2 · SUSE:Linux Enterprise Server 15 SP3-LTSS | Package registry (OSV) |
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.
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Not on record for this CVE: EPSS history · 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)
CWE-674 · Uncontrolled RecursionCVSS 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.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (1 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.