Security readout for executives and security teams
Plain-English summary
Affected Linux kernels on certain RISC-V systems can mishandle processor state when switching between tasks. This may corrupt application data and, according to the 7.8 CVSS assessment, could affect confidentiality, integrity, and availability. Exploitation requires local, low-privileged access; remotely exposed services are not directly identified as an attack path.
Executive priority
Prioritize systems running untrusted or multi-tenant workloads on affected RISC-V hardware. Other environments should remediate through normal high-severity patching, after confirming applicability. The local-access requirement reduces immediate internet-facing risk, but possible process-state corruption warrants timely action.
Technical view
With the xtheadvector extension, Linux correctly saved and restored only vector registers v0-v7. Registers v8-v31 could be corrupted during context restoration, breaking userspace and potentially exposing or altering process state. The supplied references identify two Linux stable fixes.
Likely exposure
Exposure appears limited to RISC-V systems using xtheadvector and an affected kernel. The bundle lists Linux 6.14, 6.15.5, and 6.16 as affected, but also contains an ambiguous “0” version entry. Distribution package ranges and backports must therefore be confirmed with vendors.
Exploitation context
The CVSS vector indicates a local attacker needs low privileges, with low complexity and no user interaction. The supplied material provides no evidence of active exploitation, and the CVE is not marked as included in CISA KEV. No remote attack path is documented.
Researcher notes
The defect concerns context preservation rather than memory bounds: v0-v7 were handled correctly, while v8-v31 were damaged. The source bundle does not establish exploitability beyond the CVSS assessment, provide proof-of-concept evidence, or clearly map every fixed release. Validate vendor backports against the referenced commits.
Mitigation direction
- Inventory RISC-V systems and determine whether xtheadvector support is active.
- Consult distribution guidance to map the referenced fixes to exact kernel packages.
- Install a vendor kernel update containing the applicable stable fix.
- Until updated, restrict untrusted local users and workloads on exposed systems.
Validation and detection
- Confirm each system’s architecture, active kernel version, and xtheadvector usage.
- Verify the installed kernel includes the referenced fix or an equivalent vendor backport.
- After updating, confirm the corrected kernel is active following reboot.
- Review vector-intensive workloads for unexplained failures or data corruption.
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-2025-38435 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/dd5ceea8d50e9e108a10d1e0d89fa2c9ff442ca2CVE reference, Linux
- https://git.kernel.org/stable/c/4262bd0d9cc704ea1365ac00afc1272400c2cbefCVE 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.