Security readout for executives and security teams
Plain-English summary
A Linux netfilter error-handling bug can leave network-tracking resources allocated instead of releasing them. Repeated triggering could consume resources and disrupt system availability. The supplied CVSS assessment indicates no confidentiality or integrity impact.
Executive priority
Treat as a high-priority availability risk, especially for exposed Linux infrastructure using netfilter. Accelerate vendor applicability checks and patching, but do not characterize this as actively exploited based on the supplied evidence.
Technical view
In nf_conncount error paths, some immediate returns skipped a required refcount check for ct objects, causing reference leaks. The kernel fix ensures that check always runs. CVSS 3.1 scores this 7.5: network-accessible, low complexity, unauthenticated, and availability-focused.
Likely exposure
Potential exposure exists on Linux systems whose kernels contain the vulnerable nf_conncount behavior, particularly where relevant netfilter processing handles untrusted network traffic. The supplied version data does not provide a clear affected-version range, so kernel commit ancestry or distribution guidance is required.
Exploitation context
The supplied record is not in KEV, and none of the cited sources reports active exploitation. The CVSS vector indicates possible unauthenticated network triggering, but the bundle provides no proof of exploitation, public exploit, or required configuration details.
Researcher notes
The record attributes the flaw to leaked ct references when nf_conncount error paths return before the refcounted check. Seven stable-kernel commits are referenced. Exact introduction points, affected configuration prerequisites, trigger conditions, and practical resource-exhaustion rate are not established in the bundle.
Mitigation direction
- Apply a vendor-supported kernel update incorporating the referenced nf_conncount fixes.
- Consult the Linux distribution advisory for affected build ranges and reboot requirements.
- Prioritize network-facing systems that use relevant netfilter connection-counting functionality.
- Use normal change controls because kernel remediation commonly requires service disruption or rebooting.
Validation and detection
- Inventory kernel versions and distribution package release identifiers across Linux systems.
- Compare each kernel's commit ancestry or vendor package status with the referenced fixes.
- Confirm the updated kernel is running after remediation, not merely installed.
- Review affected hosts for unexplained memory growth, resource pressure, or availability degradation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CVE-2025-71146 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6LinuxVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/08fa37f4c8c59c294e9c18fea2d083ee94074e5aCVE reference, Linux
- https://git.kernel.org/stable/c/e1ac8dce3a893641bef224ad057932f142b8a36fCVE reference, Linux
- https://git.kernel.org/stable/c/f381a33f34dda9e4023e38ba68c943bca83245e9CVE reference, Linux
- https://git.kernel.org/stable/c/325eb61bb30790ea27782203a17b007ce1754a67CVE reference, Linux
- https://git.kernel.org/stable/c/0b88be7211d21a0d68bb1e56dc805944e3654d6fCVE reference, Linux
- https://git.kernel.org/stable/c/4bd2b89f4028f250dd1c1625eb3da1979b04a5e8CVE reference, Linux
- https://git.kernel.org/stable/c/2e2a720766886190a6d35c116794693aabd332b6CVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.