Security readout for executives and security teams
Plain-English summary
A Linux CXL error-handling flaw can confuse an unexpected PCIe endpoint for a CXL memory device and crash the kernel. The supplied CVSS score is 7.8, requiring local, low-privileged access. Systems using affected kernels with CXL hardware or related error-record processing deserve prompt review.
Executive priority
Prioritize remediation for CXL-capable systems running potentially affected kernels, especially shared hosts with untrusted local users. For systems without CXL exposure, validate applicability before emergency action. There is no supplied evidence of active exploitation, but a kernel crash risk and high CVSS score justify timely patching.
Technical view
The CXL RAS CPER protocol-error handler assumed a reported endpoint was a CXL Type-3 device bound to cxl_pci, then interpreted its driver data accordingly. The correction verifies that the endpoint parents a cxl_memdev and narrows device-lock scope. The source states these fragile assumptions can cause crashes.
Likely exposure
The bundle identifies Linux 6.15 through the listed 6.15.5 and 6.16 entries as affected, but its version representation is ambiguous. Practical exposure likely requires the vulnerable kernel handler and relevant CXL/CPER processing. Confirm exact distribution backports and hardware configuration with the kernel vendor.
Exploitation context
CISA KEV status is false, and the supplied sources provide no evidence of active exploitation. CVSS describes a local, low-complexity attack requiring low privileges and no user interaction. The sources do not explain how an attacker would trigger or control the necessary error record, so real-world exploitability remains uncertain.
Researcher notes
The disclosed root cause is device-type and driver-binding confusion in cxl_cper_handle_prot_err(), plus overly broad locking. The fix validates the cxl_memdev relationship before accessing assumed driver data and prepares for non-cxl_pci CXL accelerators. No CWE, proof of concept, trigger details, or confirmed exploitation is supplied.
Mitigation direction
- Install a vendor kernel containing the applicable referenced stable fix or documented backport.
- Check distribution advisories for corrected package versions; upstream version entries alone are ambiguous.
- Prioritize CXL-enabled systems and hosts permitting untrusted local access.
- Restrict unnecessary local accounts while patching, treating this as interim risk reduction.
Validation and detection
- Record each host's running kernel build and whether CXL devices or related error handling are present.
- Confirm the kernel package includes an applicable referenced commit or vendor-confirmed backport.
- Verify the handler checks for a parent cxl_memdev before interpreting driver data.
- Review kernel crash records for failures associated with CXL RAS protocol-error handling.
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-2025-38252 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/4bcb8dd36e9e3fad6c22862ac5b6993df838309bCVE reference, Linux
- https://git.kernel.org/stable/c/3c70ec71abdaf4e4fa48cd8fdfbbd864d78235a8CVE 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.