Security readout for executives and security teams
Plain-English summary
This is a Linux kernel issue affecting RISC-V systems. The kernel could lose a permission state during task switches, causing crashes under heavy load. The public record supports reliability and denial-of-service concern, not confirmed data theft or remote compromise.
Executive priority
Prioritize for RISC-V fleets where kernel stability matters, especially shared or high-load environments. This is not supported as an internet-scale emergency from the provided evidence.
Technical view
On RISC-V, switch_to() did not save and restore SR_SUM across context switches. Code returning to a user-access-enabled region could find SR_SUM cleared, causing kernel faults during user-memory access paths. The fix preserves SR_SUM across switches.
Likely exposure
Exposure is likely limited to Linux deployments on RISC-V hardware or virtualized RISC-V kernels running affected versions or commits. Non-RISC-V Linux systems are not implicated by the provided sources.
Exploitation context
The source describes crashes observed under heavy syzkaller stress testing. There is no KEV listing and no cited evidence of active exploitation, remote attack paths, privilege escalation, or public weaponization.
Researcher notes
The record links the bug to SR_SUM preservation over switch_to() and prior put_user() evaluation behavior. Impact evidence is crash-oriented. Affected version metadata is sparse, so validation should rely on architecture, kernel lineage, and fixed commit presence.
Mitigation direction
- Identify RISC-V Linux systems and their exact kernel versions.
- Apply vendor kernel updates containing the referenced stable fixes.
- Map distro packages to the upstream fixed commits before closing exposure.
- If updates are unavailable, follow vendor guidance for temporary risk reduction.
Validation and detection
- Confirm whether affected assets run Linux on RISC-V architecture.
- Check kernel package changelogs for commits 69ea599a8dab or 788aa64c01f1.
- Review logs for kernel Oops or panic messages involving schedule_tail.
- Run normal regression testing after applying the patched kernel.
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
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
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CVE-2025-38261 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
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/69ea599a8dab93a620c92c255be4239a06290a77CVE reference, Linux
- https://git.kernel.org/stable/c/788aa64c01f1262310b4c1fb827a36df170d86eaCVE 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.