Security readout for executives and security teams
Plain-English summary
A Linux netdevsim networking flaw can trigger unsafe kernel behavior when netpoll interferes with packet-processing state. A local, low-privileged attacker may be able to compromise confidentiality, integrity, or availability, according to the supplied CVSS assessment. Exposure depends on the affected kernel code and use of netdevsim with netpoll.
Executive priority
Treat as a high-priority kernel maintenance issue on systems using the affected networking path, especially multi-user or locally accessible hosts. Broad emergency action is not supported by the evidence because active exploitation is unreported and exposure requires local access plus relevant netdevsim/netpoll conditions.
Technical view
The netdevsim netpoll path could call napi_complete() when NAPI was not scheduled, apparently because netpoll prematurely cleared the scheduling bit. This can produce a warning in napi_complete_done() and unsafe kernel-state handling. Referenced stable-kernel commits prevent completion from this context.
Likely exposure
Likely exposure is limited to Linux systems running affected kernel code where netdevsim and netpoll are available or used. The supplied affected-version data is ambiguous and does not clearly define complete vulnerable or fixed ranges. Confirm status against distribution-specific kernel advisories and backports.
Exploitation context
The CVSS vector describes local access, low complexity, low privileges, and no user interaction, with potentially high confidentiality, integrity, and availability impact. The bundle marks this CVE as absent from KEV and provides no evidence of active exploitation or a public exploit.
Researcher notes
The source bundle identifies the failure mechanism and three stable-kernel commits but provides no CWE, exploit evidence, or unambiguous release-range mapping. Researchers should compare distribution patches with the referenced commits and validate reachability of the netdevsim netpoll path without treating warning reproduction alone as proof of full compromise.
Mitigation direction
- Apply a vendor-supported kernel update containing the referenced stable-kernel correction.
- Check Linux distribution guidance for backport and fixed-package details.
- Where operationally safe, disable or avoid unnecessary netdevsim and netpoll use until updated.
- Prioritize shared or untrusted-user systems where local low-privileged access exists.
Validation and detection
- Record the running kernel release and distribution package revision.
- Determine whether netdevsim is built, loaded, or actively used.
- Check whether netpoll-dependent functionality is configured on affected systems.
- Verify the installed kernel includes the applicable referenced correction or vendor backport.
- Review kernel logs for warnings involving napi_complete_done, __napi_poll, or netdevsim.
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-2025-38270 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9LinuxVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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/a8ff2e362d901200a1075c3ca9c56d9c7bbef389CVE reference, Linux
- https://git.kernel.org/stable/c/6837dd877270c57689bd866de9f3de14172c2439CVE reference, Linux
- https://git.kernel.org/stable/c/1264971017b4d7141352a7fe29021bdfce5d885dCVE 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.