CVE-2026-7639
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedSoftware installed and run as a non-privileged user may conduct a sequence of improper GPU system calls causing use after free, which helps in facilitating unprivileged memory access from a shader code. Triggering failure path in the MMU mapping logic by a malicious code could lead to incomplete cleanup of an internal driver state, allowing for future unauthorized access to the contents of the physical memory.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceUse-after-free vulnerability in GPU driver MMU mapping logic allows non-privileged users to make improper GPU system calls that cause incomplete cleanup of internal driver state, enabling unauthorized access to physical memory contents from shader code.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 26.1= 26.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
-
Identify installed GPU driver and versionUse system commands such as 'lspci -v' for PCIe GPUs, 'lsmod' for loaded kernel modules, or vendor-specific tools like 'nvidia-smi', 'amdgpu-version', or 'intel_gpu_top' to list the GPU hardware and driver versionAffected if The driver version matches or falls within an affected version range for this vulnerability (compare to vendor security advisories)
-
Verify if non-privileged users have GPU accessCheck /dev/dri/*, /dev/nvidia*, or similar GPU device permissions using 'ls -la /dev/dri/*' or 'ls -la /dev/nvidia*'; examine group memberships ('grep video /etc/group' or 'grep render /etc/group')Affected if Non-privileged users (especially untrusted or sandboxed users) have read/write access to GPU device nodes, enabling them to issue GPU system calls
-
Confirm GPU compute or shader execution capability is enabledCheck if GPU compute features are active: look for loaded GPU kernel modules, check for compute-capable userland libraries (OpenCL, CUDA, Vulkan compute), or verify GPU is not in a disabled state via vendor toolsAffected if The GPU can execute shader or compute workloads - this is required for the vulnerability to be exploitable
-
Review system for abnormal GPU memory access patternsMonitor dmesg, journalctl, or vendor driver logs for MMU-related errors, memory mapping failures, or use-after-free warnings; use tools like 'dmesg | grep -i gpu' or vendor-specific diagnostic logsAffected if Logs contain MMU mapping errors, incomplete state cleanup warnings, or memory access violations related to GPU operations
-
Check for available vendor security advisoriesSearch vendor security channels (NVIDIA, AMD, Intel) for CVE-2026-7639 or similar GPU MMU use-after-free advisories to confirm applicability to your specific driver versionAffected if Vendor has published an advisory confirming your driver version is affected by this vulnerability
A user is affected if they run an affected GPU driver version with non-privileged user access to GPU compute capabilities, allowing shader code execution that could trigger the use-after-free in MMU mapping logic.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data26.1
Apply vendor-provided GPU driver patches addressing the use-after-free and MMU mapping state cleanup issues; until patched, restrict untrusted code from executing GPU workloads.
- Consultation8.0 h
- Implementation24.0 h
- Testing16.0 h
- Review / QA8.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $15,616.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-7639 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-7639 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data