Security readout for executives and security teams
Plain-English summary
A Linux AMD XDNA accelerator driver flaw can access memory-management data after it has been freed during device unbinding, causing a kernel crash. The supplied CVSS score is 7.8 because a local, low-privileged attacker may potentially affect confidentiality, integrity, and availability, although the sources only directly document test-triggered crashes.
Executive priority
Treat as a high-priority kernel update for systems using AMD XDNA acceleration, especially multi-user or shared-compute hosts. Other Linux systems are less likely to reach the vulnerable path, but version and driver exposure should be verified promptly rather than assumed.
Technical view
The accel/amdxdna driver does not retain the process mm structure for the complete IOMMU Shared Virtual Addressing bind/unbind lifetime. iommu_sva_unbind_device() can therefore access iommu_mm after its associated mm is freed. The kernel fix takes an explicit mm reference after binding and releases it after unbinding.
Likely exposure
Exposure appears limited to affected Linux kernels using the AMD XDNA accelerator driver and IOMMU SVA functionality. The bundle lists versions including 6.14, 6.18.14, 6.19.4, and 7.0, but does not provide sufficiently clear range semantics; confirm status with the kernel or distribution vendor.
Exploitation context
The CVSS vector describes local access, low privileges, low complexity, and no user interaction. The supplied record is not in KEV, and no cited source reports active exploitation or a public exploit. Test-triggered kernel crashes are documented; broader confidentiality or integrity impact is scored but not demonstrated in the supplied evidence.
Researcher notes
This is a lifetime-management defect resembling use-after-free behavior, but the CVE record supplies no CWE. Evidence establishes stale mm access and crashes during testing. It does not establish reliable privilege escalation, information disclosure, active exploitation, or exact affected-version intervals. The referenced stable commits are the strongest basis for fix verification.
Mitigation direction
- Update to a vendor-supported kernel containing the referenced stable fix.
- Confirm fixed-package availability and affected version boundaries with your Linux distribution vendor.
- Prioritize systems exposing AMD XDNA acceleration to untrusted or low-privileged local users.
- Restrict unnecessary local access until affected systems are updated.
Validation and detection
- Inventory kernel versions and distribution package revisions on systems with AMD XDNA hardware.
- Determine whether the accel/amdxdna driver and IOMMU SVA path are active.
- Compare deployed kernel sources or vendor advisories against the three referenced stable commits.
- Review kernel logs for crashes involving iommu_sva_unbind_device or AMD XDNA teardown.
- After updating, verify the vendor package includes the mm-reference lifetime fix.
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-2026-45931 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/f6b4c1d98a7b8040d4d02e89425b3942016a2c2cCVE reference, Linux
- https://git.kernel.org/stable/c/f31ccf6278132a35a652fe5eeac3941e1e912398CVE reference, Linux
- https://git.kernel.org/stable/c/a9162439ad792afcddc04718408ec1380b7a5f63CVE 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.