wifi: mt76: mt7921: fix a potential clc buffer length underflow
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921: fix a potential clc buffer length underflow The buf_len is used to limit the iterations for retrieving the country power setting and may underflow under certain conditions due to changes in the power table in CLC. This underflow leads to an almost infinite loop or an invalid power setting resulting in driver initialization failure.
- Published
- May 28, 2026
- Updated
- Jun 24, 2026
- EPSS
- 0.2% · 6th percentile
- CWE
- CWE-787
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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 · 0.2%
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| 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 kernel6.1.75 and later · before 6.1.175
- linux linux kernel6.6.14 and later · before 6.6.140
- linux linux kernel6.7.2 and later · before 6.12.88
- linux linux kernel6.13 and later · before 6.18.30
- linux linux kernel6.19 and later · before 7.0.7
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 5c8cac512844ad593d31258e215908014381bee2, 6.8affected
- 0c9318d49e501a5d50b02bd91a4813bde2353488 and later · before 2a79b1a492bcfa725383b6580cd93a6862308c85affected · git
- 15173a1697236793e9e900b82fece6f99d41b2a7 and later · before e451c325b000b9a0081fd93bc6d103d6943d4b55affected · git
- fa6ad88e023ddfa6c5dcdb466d159e89f451e305 and later · before 90cc573fd2f46ddbc2c329e7814b5ba3deb7b939affected · git
- fa6ad88e023ddfa6c5dcdb466d159e89f451e305 and later · before 0aa63d33742b805d1a218d18d12b983cce4b2f7baffected · git
- fa6ad88e023ddfa6c5dcdb466d159e89f451e305 and later · before a0111847f0b4f6023f6dd320114697514e024ba3affected · git
- fa6ad88e023ddfa6c5dcdb466d159e89f451e305 and later · before 5373f8b19e568b5c217832b9bbef165bd2b2df14affected · git
- 6.1.75 and later · before 6.1.175affected · semver
- 6.6.14 and later · before 6.6.140affected · semver
- 6.7.2 and later · before 6.8affected · semver
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 6.1.176-1 | 6.1.176-1 |
| Debian:13 | linux | before 6.12.88-1 | 6.12.88-1 |
| Debian:14 | linux | before 7.0.7-1 | 7.0.7-1 |
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 |
|---|---|---|
| Linux Linux | 0aa63d33742b805d1a218d18d12b983cce4b2f7b | Vendor (CNA) |
| Linux Linux | 2a79b1a492bcfa725383b6580cd93a6862308c85 | Vendor (CNA) |
| Linux Linux | 5373f8b19e568b5c217832b9bbef165bd2b2df14 | Vendor (CNA) |
| Linux Linux | 6.1.175 | Vendor (CNA) |
| Linux Linux | 6.6.140 | Vendor (CNA) |
| Linux Linux | 6.8 | Vendor (CNA) |
| Linux Linux | 90cc573fd2f46ddbc2c329e7814b5ba3deb7b939 | Vendor (CNA) |
| Linux Linux | a0111847f0b4f6023f6dd320114697514e024ba3 | Vendor (CNA) |
| Linux Linux | e451c325b000b9a0081fd93bc6d103d6943d4b55 | Vendor (CNA) |
| debian:linux | 6.1.176-1 · Debian:12 | 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.
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.
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-26-0290 · Jun 2, 2026(Linux Kernel Güvenlik Bildirimi)
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-787 · Out-of-bounds WriteCVSS 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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/0aa63d33742b805d1a218d18d12b983cce4b2f7b
- git.kernel.org/stable/c/2a79b1a492bcfa725383b6580cd93a6862308c85
- git.kernel.org/stable/c/5373f8b19e568b5c217832b9bbef165bd2b2df14
- git.kernel.org/stable/c/90cc573fd2f46ddbc2c329e7814b5ba3deb7b939
- git.kernel.org/stable/c/a0111847f0b4f6023f6dd320114697514e024ba3
- git.kernel.org/stable/c/e451c325b000b9a0081fd93bc6d103d6943d4b55
Vendor advisories and official records. Exploit/PoC links are deliberately left out.