Security readout for executives and security teams
Plain-English summary
A Linux graphics reference-counting flaw can release memory backing a framebuffer while it remains in use. Later display operations may access the released object and crash. Exploitation requires local, low-privileged access; no user interaction is required. The record scores it 7.8 High, but the supplied evidence does not establish remote exploitation or privilege escalation.
Executive priority
Treat this as a high-priority local kernel issue on systems with graphics access shared across trust boundaries. Patch promptly through supported distribution channels, especially on multi-user endpoints and graphical infrastructure. Emergency internet-edge action is not supported by the evidence because the attack vector is local and active exploitation is not reported.
Technical view
DRM framebuffer creation did not retain references to associated GEM handles. Releasing a handle could consequently free its dma-buf while the framebuffer still referenced it, producing a use-after-release condition during later mode-setting or page-flip operations. The documented failure is a segmentation fault in dma_buf_vmap. The fix acquires GEM-handle references and releases them during framebuffer cleanup.
Likely exposure
Exposure is concentrated on Linux systems running affected kernels where local users or processes can access DRM framebuffer and mode-setting interfaces. Drivers using shadow planes to vmap dma-bufs during page flips are highlighted as an easy trigger. Headless systems or environments denying untrusted DRM access may have lower practical exposure, but the supplied sources do not define complete driver-specific scope.
Exploitation context
The CVSS vector indicates local access, low complexity, low privileges, and no user interaction. CISA KEV status is false in the supplied record, and no cited source reports active exploitation. The evidence demonstrates a graphics-path segmentation fault; it does not confirm reliable privilege escalation, data theft, or remote attack capability.
Researcher notes
The underlying reference-counting defect predates commit 1a148af06000; that change reportedly makes the fault easier to trigger by using the dma-buf field more broadly. Four stable-kernel commits are cited, suggesting branch-specific backports. The supplied version list is ambiguous and includes an unexplained “0,” so distribution advisories and commit ancestry should govern exposure decisions.
Mitigation direction
- Install a vendor-supported kernel containing the applicable referenced stable fix.
- Reboot into the updated kernel and confirm the previous kernel is no longer active.
- Prioritize multi-user workstations, graphical servers, kiosks, and systems exposing DRM devices to untrusted processes.
- Until patched, restrict unnecessary untrusted access to DRM device interfaces where operationally feasible.
- Consult the Linux distribution advisory for exact package versions and backport status.
Validation and detection
- Inventory running kernel versions and compare them with distribution-specific affected and fixed package guidance.
- Verify the installed kernel includes the applicable referenced GEM framebuffer fix.
- Confirm systems rebooted into the remediated kernel after package installation.
- Review kernel logs for dma_buf_vmap warnings, DRM faults, or crashes during mode-setting operations.
- Check permissions and container device mappings for unnecessary exposure of DRM devices.
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-2025-38449 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
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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/cb4c956a15f8b7f870649454771fc3761f504b5fCVE reference, Linux
- https://git.kernel.org/stable/c/08480e285c6a82ce689008d643e4a51db0aaef8bCVE reference, Linux
- https://git.kernel.org/stable/c/3cf520d9860d4ec9f7f32068825da31f18dd3f25CVE reference, Linux
- https://git.kernel.org/stable/c/5307dce878d4126e1b375587318955bd019c3741CVE reference, Linux
Products and packages named in the record
CWE details
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