mptcp: plug races between subflow fail and subflow creation
Noroxi assessment
Priority: Monitor (action score 31/100)
- 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: 0.32% (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.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: Linux Linux 659da22dee5ff316ba63bdaeeac7b58b5442f6c2, 7c96d519ee15a130842a6513530b4d20acd2bfcd, c476d627584b7589a134a8b48dd5c6639e4401c5; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1.
Low priority for now. Upgrade to Linux Linux 659da22dee5ff316ba63bdaeeac7b58b5442f6c2, 7c96d519ee15a130842a6513530b4d20acd2bfcd, c476d627584b7589a134a8b48dd5c6639e4401c5; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1 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
In the Linux kernel, the following vulnerability has been resolved: mptcp: plug races between subflow fail and subflow creation We have races similar to the one addressed by the previous patch between subflow failing and additional subflow creation. They are just harder to trigger. The solution is similar. Use a separate flag to track the condition 'socket state prevent any additional subflow creation' protected by the fallback lock. The socket fallback makes such flag true, and also receiving or sending an MP_FAIL option. The field 'allow_infinite_fallback' is now always touched under the relevant lock, we can drop the ONCE annotation on write.
- Published
- Aug 16, 2025
- Updated
- Oct 15, 2026
- EPSS
- 0.3% · 24th percentile
- CWE
- —
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 · 0.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 7.8
- CNA · Linux
- 9.4
- 1.6 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
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.
Running WordPress? Scan your site free with WP Lens
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 |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux11.0
- linux linux kernel5.15 and later · before 6.1.149
- linux linux kernel6.2 and later · before 6.6.101
- linux linux kernel6.7 and later · before 6.12.40
- linux linux kernel6.13 and later · before 6.15.8
- linux linux kernel6.16
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
- 5.15affected
- 478d770008b03ed9d74bdc8add2315b7fd124ecc and later · before c476d627584b7589a134a8b48dd5c6639e4401c5affected · git
- 478d770008b03ed9d74bdc8add2315b7fd124ecc and later · before 7c96d519ee15a130842a6513530b4d20acd2bfcdaffected · git
- 478d770008b03ed9d74bdc8add2315b7fd124ecc and later · before f81b6fbe13c7fc413b5158cdffc6a59391a2a8dbaffected · git
- 478d770008b03ed9d74bdc8add2315b7fd124ecc and later · before 659da22dee5ff316ba63bdaeeac7b58b5442f6c2affected · git
- 478d770008b03ed9d74bdc8add2315b7fd124ecc and later · before def5b7b2643ebba696fc60ddf675dca13f073486affected · git
- before 5.15not affected · semver
- 6.1.149 and later · up to and including 6.1.*not affected · semver
- 6.6.101 and later · up to and including 6.6.*not affected · semver
- 6.12.40 and later · up to and including 6.12.*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 | before 6.1.153-1 | 6.1.153-1 |
| Debian:13 | linux | before 6.12.41-1 | 6.12.41-1 |
| Debian:14 | linux | before 6.16.3-1 | 6.16.3-1 |
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
Published before and after this one in the same product
- ← EarlierCVE-2025-38528Aug 16, 2025 · bpf: Reject %p% format string in bprintf-like helpers22Monitor
- ← EarlierCVE-2025-38539Aug 16, 2025 · tracing: Add down_write(trace_event_sem) when adding trace event22Monitor
- Later →CVE-2025-38554Aug 19, 2025 · mm: fix a UAF when vma->mm is freed after vma->vm_refcnt got dropped31Monitor
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 | 659da22dee5ff316ba63bdaeeac7b58b5442f6c2 | Vendor (CNA) |
| Linux Linux | 7c96d519ee15a130842a6513530b4d20acd2bfcd | Vendor (CNA) |
| Linux Linux | c476d627584b7589a134a8b48dd5c6639e4401c5 | Vendor (CNA) |
| Linux Linux | def5b7b2643ebba696fc60ddf675dca13f073486 | Vendor (CNA) |
| Linux Linux | f81b6fbe13c7fc413b5158cdffc6a59391a2a8db | Vendor (CNA) |
| azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 | 6.6.104.2-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.153-1 · 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).
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)
—
CVSS 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
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (6 more)Show less
- git.kernel.org/stable/c/7c96d519ee15a130842a6513530b4d20acd2bfcd
- git.kernel.org/stable/c/c476d627584b7589a134a8b48dd5c6639e4401c5
- git.kernel.org/stable/c/def5b7b2643ebba696fc60ddf675dca13f073486
- git.kernel.org/stable/c/f81b6fbe13c7fc413b5158cdffc6a59391a2a8db
- lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- cert-portal.siemens.com/productcert/html/ssa-032379.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.