efivarfs: Rate limit statfs() handler
Noroxi assessment
Priority: Monitor (action score 0/100)
- 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: 0.20% (FIRST EPSS).
- Fixed version: Linux Linux 0dbc2e94b81df5a1264068b6ed3605c654b8afcb, 3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae, 6.1.188; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 0dbc2e94b81df5a1264068b6ed3605c654b8afcb, 3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae, 6.1.188; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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
In the Linux kernel, the following vulnerability has been resolved: efivarfs: Rate limit statfs() handler Ravi reports that statfs() may be called by unprivileged users on the efivarfs mount point, which may result in a flood of calls to the QueryVariableInfo() runtime service. These calls are disproportionately costly on x86 systems where the variable store is backed by SMM, as each SMM entry requires a rendez-vous of all the CPUs. So rate limit the calls to QueryVariableInfo() at twice per second, and return the most recently obtained value for calls that are elided.
- Published
- Sep 11, 2026
- Updated
- Sep 14, 2026
- EPSS
- 0.2% · 10th percentile
- CWE
- —
Report tools
Action score
0
Monitor
Low priority for now.
- CVSS
- 0 / 40 · —
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
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.
—
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
- 6.5affected
- 115409cbb6a296d73702a62c54c5b1b11cb88b3d and later · before 97d71ebee48cd1b29091762b3e5cca4f815dd84caffected · git
- d86ff3333cb1d5f42d8898fb5fdb304e143c0237 and later · before 3cd611c9f1dbcc116c8af5112e3c1783c8cde2aeaffected · git
- d86ff3333cb1d5f42d8898fb5fdb304e143c0237 and later · before 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41affected · git
- d86ff3333cb1d5f42d8898fb5fdb304e143c0237 and later · before 92895a14329cc9533e2a74a265214f690ba3851aaffected · git
- d86ff3333cb1d5f42d8898fb5fdb304e143c0237 and later · before 0dbc2e94b81df5a1264068b6ed3605c654b8afcbaffected · git
- d86ff3333cb1d5f42d8898fb5fdb304e143c0237 and later · before b2326338dc683e8c1067c0cbf7a47986c4190902affected · git
- 6.1.178 and later · before 6.1.188affected · semver
- before 6.5not affected · semver
- 6.1.188 and later · up to and including 6.1.*not affected · 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 | all versions | — |
| Debian:12 | linux-6.12 | before 6.12.111-1~deb12u1 | 6.12.111-1~deb12u1 |
| Debian:13 | linux | before 6.12.111-1 | 6.12.111-1 |
| Debian:14 | linux | before 7.2.6-1 | 7.2.6-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
- CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler40Plan
- CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index40Plan
- CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index40Plan
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 | 0dbc2e94b81df5a1264068b6ed3605c654b8afcb | Vendor (CNA) |
| Linux Linux | 3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae | Vendor (CNA) |
| Linux Linux | 6.1.188 | Vendor (CNA) |
| Linux Linux | 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41 | Vendor (CNA) |
| Linux Linux | 92895a14329cc9533e2a74a265214f690ba3851a | Vendor (CNA) |
| Linux Linux | 97d71ebee48cd1b29091762b3e5cca4f815dd84c | Vendor (CNA) |
| Linux Linux | b2326338dc683e8c1067c0cbf7a47986c4190902 | Vendor (CNA) |
| azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 | — | Microsoft (MSRC) |
| azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 | 6.6.157.1-1 · Release Notes | Microsoft (MSRC) |
| debian:linux | 6.12.111-1 · Debian:13 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.111-1~deb12u1 · 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-26-1085 · Sep 14, 2026(Linux Kernel Güvenlik Bildirimi)
Technical details
No CVSS vector for this record, so attack conditions can't be derived.
Weakness class (CWE)
—
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 (5 more)Show less
- git.kernel.org/stable/c/3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae
- git.kernel.org/stable/c/8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41
- git.kernel.org/stable/c/92895a14329cc9533e2a74a265214f690ba3851a
- git.kernel.org/stable/c/97d71ebee48cd1b29091762b3e5cca4f815dd84c
- git.kernel.org/stable/c/b2326338dc683e8c1067c0cbf7a47986c4190902
Vendor advisories and official records. Exploit/PoC links are deliberately left out.