An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4.
Noroxi assessment
Priority: Monitor (action score 26/100)
- 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: 0.51% (FIRST EPSS).
- Someone with local access to the system can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: linux (Debian:12) 5.2.6-1; kernel-debug (openSUSE:Leap 15.1) 4.12.14-lp151.28.59.1; kernel-default (openSUSE:Leap 15.1) 4.12.14-lp151.28.59.1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to linux (Debian:12) 5.2.6-1; kernel-debug (openSUSE:Leap 15.1) 4.12.14-lp151.28.59.1; kernel-default (openSUSE:Leap 15.1) 4.12.14-lp151.28.59.1 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
An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4. Incorrect access permissions for the efivar_ssdt ACPI variable could be used by attackers to bypass lockdown or secure boot restrictions, aka CID-1957a85b0032.
- Published
- Jul 15, 2020
- Updated
- Jun 16, 2026
- EPSS
- 0.5% · 42th percentile
- CWE
- —
Report tools
Action score
26
Monitor
Low priority for now.
- CVSS
- 26 / 40 · 6.7 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
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 |
| opensuse | leap | cpe:2.3:o:opensuse:leap |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux16.04
- canonical ubuntu linux18.04
- linux linux kernelbefore 5.4
- opensuse leap15.1
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 5.2.6-1 | 5.2.6-1 |
| openSUSE:Leap 15.1 | kernel-debug | before 4.12.14-lp151.28.59.1 | 4.12.14-lp151.28.59.1 |
| openSUSE:Leap 15.1 | kernel-default | before 4.12.14-lp151.28.59.1 | 4.12.14-lp151.28.59.1 |
| openSUSE:Leap 15.1 | kernel-docs | before 4.12.14-lp151.28.59.1 | 4.12.14-lp151.28.59.1 |
| openSUSE:Leap 15.1 | kernel-kvmsmall | before 4.12.14-lp151.28.59.1 | 4.12.14-lp151.28.59.1 |
| openSUSE:Leap 15.1 | kernel-obs-build | before 4.12.14-lp151.28.59.1 | 4.12.14-lp151.28.59.1 |
| openSUSE:Leap 15.1 | kernel-obs-qa | before 4.12.14-lp151.28.59.1 | 4.12.14-lp151.28.59.1 |
| openSUSE:Leap 15.1 | kernel-source | before 4.12.14-lp151.28.59.1 | 4.12.14-lp151.28.59.1 |
| openSUSE:Leap 15.1 | kernel-syms | before 4.12.14-lp151.28.59.1 | 4.12.14-lp151.28.59.1 |
| openSUSE:Leap 15.1 | kernel-vanilla | before 4.12.14-lp151.28.59.1 | 4.12.14-lp151.28.59.1 |
| Red Hat:enterprise_linux:8::baseos | bpftool | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| Red Hat:enterprise_linux:8::baseos | bpftool-debuginfo | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| Red Hat:enterprise_linux:8::baseos | kernel | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| Red Hat:enterprise_linux:8::baseos | kernel-abi-whitelists | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| Red Hat:enterprise_linux:8::baseos | kernel-core | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| Red Hat:enterprise_linux:8::baseos | kernel-cross-headers | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| Red Hat:enterprise_linux:8::baseos | kernel-debug | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| Red Hat:enterprise_linux:8::baseos | kernel-debug-core | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| Red Hat:enterprise_linux:8::baseos | kernel-debug-debuginfo | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| Red Hat:enterprise_linux:8::baseos | kernel-debug-devel | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| Red Hat:enterprise_linux:8::baseos | kernel-debug-modules | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| Red Hat:enterprise_linux:8::baseos | kernel-debug-modules-extra | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| Red Hat:enterprise_linux:8::baseos | kernel-debuginfo | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| Red Hat:enterprise_linux:8::baseos | kernel-debuginfo-common-aarch64 | before 0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- 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
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
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 | 5.2.6-1 · Debian:12 | Package registry (OSV) |
| opensuse:kernel-debug | 4.12.14-lp151.28.59.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-default | 4.12.14-lp151.28.59.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-docs | 4.12.14-lp151.28.59.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 4.12.14-lp151.28.59.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-obs-build | 4.12.14-lp151.28.59.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 4.12.14-lp151.28.59.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-source | 4.12.14-lp151.28.59.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-syms | 4.12.14-lp151.28.59.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-vanilla | 4.12.14-lp151.28.59.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| red hat:bpftool | 0:4.18.0-193.14.3.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:bpftool-debuginfo | 0:4.18.0-193.14.3.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel | 0:4.18.0-193.14.3.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-abi-whitelists | 0:4.18.0-193.14.3.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-core | 0:4.18.0-193.14.3.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-cross-headers | 0:4.18.0-193.14.3.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug | 0:4.18.0-193.14.3.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug-core | 0:4.18.0-193.14.3.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:4.18.0-193.14.3.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:4.18.0-193.14.3.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug-modules | 0:4.18.0-193.14.3.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug-modules-extra | 0:4.18.0-193.14.3.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| suse:kernel-azure | 4.12.14-8.38.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP1 | Package registry (OSV) |
| suse:kernel-default | 4.12.14-150.55.1 · SUSE:Linux Enterprise Live Patching 15 | Package registry (OSV) |
| suse:kernel-docs | 4.12.14-150.55.1 · SUSE:Linux Enterprise High Performance Computing 15-ESPOS | Package registry (OSV) |
| suse:kernel-livepatch-SLE15_Update_19 | 1-1.3.1 · SUSE:Linux Enterprise Live Patching 15 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP1_Update_13 | 1-3.3.1 · SUSE:Linux Enterprise Live Patching 15 SP1 | Package registry (OSV) |
| suse:kernel-obs-build | 4.12.14-150.55.1 · SUSE:Linux Enterprise High Performance Computing 15-ESPOS | Package registry (OSV) |
| suse:kernel-source | 4.12.14-150.55.1 · SUSE:Linux Enterprise High Performance Computing 15-ESPOS | Package registry (OSV) |
| suse:kernel-source-azure | 4.12.14-8.38.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP1 | Package registry (OSV) |
+4
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.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
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-20-567 · Aug 4, 2020(Linux Kernel Güvenlik Güncellemesi)
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- Administrator privileges are required.
- 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
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (12 more)Show less
- www.openwall.com/lists/oss-security/2020/07/20/6
- www.openwall.com/lists/oss-security/2020/07/29/3
- www.openwall.com/lists/oss-security/2020/07/30/2
- www.openwall.com/lists/oss-security/2020/07/30/3
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e
- git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh
- mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.html
- usn.ubuntu.com/4426-1/
- usn.ubuntu.com/4427-1/
- usn.ubuntu.com/4439-1/
- usn.ubuntu.com/4440-1/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.