Security readout for executives and security teams
Plain-English summary
A Linux Wi-Fi driver flaw can corrupt internal station lists after mt7915 hardware restarts. On systems using the MediaTek mt7915 through the mt76 driver, this may undermine confidentiality, integrity, or availability. The supplied record rates it 8.8, but does not establish practical exploitability or observed attacks.
Executive priority
Treat as a high-priority targeted update where mt7915 hardware is present, especially on critical wireless infrastructure. It is not a fleet-wide Linux emergency without that driver exposure, and there is no supplied evidence of active exploitation. Require rapid inventory, vendor confirmation, and scheduled remediation based on operational criticality.
Technical view
During mt7915 hardware restart, station objects are recreated while existing WCID list state may remain. Entries can be added again before initialization completes, causing list corruption. The fix clears relevant lists and resets each WCID station pointer before ieee80211_restart_hw. The record maps the issue to CWE-787.
Likely exposure
Exposure is limited to Linux systems using the mt76 mt7915 Wi-Fi driver and affected kernel code. The CVSS vector indicates an adjacent-network attack surface without privileges or user interaction. The supplied version data is ambiguous, so administrators should verify their exact kernel build against vendor advisories and the referenced stable commits.
Exploitation context
No active exploitation is established: the supplied record is not in KEV, and the cited sources provide no evidence of attacks or a public exploit. The 8.8 score reflects potential impact and adjacent-network reachability, not confirmed exploitation. Trigger conditions beyond an mt7915 hardware restart are not fully documented in the bundle.
Researcher notes
The affected-version array appears incomplete or flattened, including duplicated commit identifiers and unclear version boundaries. Do not infer a reliable vulnerable range from it alone. The source describes post-restart WCID list corruption and pointer reset logic; it does not demonstrate attacker-controlled memory corruption, a working exploit, or specific confidentiality and integrity outcomes.
Mitigation direction
- Update to a vendor-supported kernel containing the referenced stable fix.
- Confirm the distribution backport status rather than relying only on the displayed kernel version.
- Prioritize Wi-Fi infrastructure and exposed systems using MediaTek mt7915 hardware.
- If patching is delayed, consult vendor guidance for safe driver or hardware workarounds.
Validation and detection
- Inventory Linux hosts for MediaTek mt7915 hardware and the mt76 driver.
- Record exact kernel package versions, distribution revisions, and vendor backport status.
- Compare kernel source or package changelogs with the two referenced stable commits.
- After updating, verify the running kernel includes the fix and restart-related Wi-Fi faults no longer occur.
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2025-39862 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/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.
SSVC decision data
CVSS vector scores
2 official scoresWe 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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.85.9LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/8fa8eb52bc2eb08d93202863b5fc478e0bebc00cCVE reference, Linux
- https://git.kernel.org/stable/c/065c79df595af21d6d1b27d642860faa1d938774CVE 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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.