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NVD / CVE Program· CNA imaginationtech

CVE-2026-21734: GPU DDK - libusc OOB write at TreeRemove during WebGPU shader compilation

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A web page that contains unusual GPU shader code is loaded into the GPU compiler process and can trigger a write out-of-bounds write crash in the GPU shader compiler library. On certain platforms, when the compiler process has system privileges this could enable further exploits on the device. An edge case using a very small value in GPU shader code can cause a segmentation fault in the GPU shader compiler due to am out-of-bounds write.

HighCVSS 7.7 · v3.1—No exploit No fix recorded
Published
Jun 26, 2026
Updated
Oct 25, 2026
EPSS
0.1% · 5th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-21734

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
imaginationtechddk

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • imaginationtech ddkup to 25.2 inclusive
  • imaginationtech ddk25.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (imaginationtech). Independent of NVD's CPE analysis and usually ahead of it.

  • Imagination Technologies Graphics DDK

    • 26.1 RTMnot affected
    • 1.18 RTM, 23.2 RTMaffected
    • 24.1 RTM and later · up to and including 24.2 RTMaffected
    • 25.1 RTM and later · up to and including 25.3 RTMaffected

Same product

imaginationtech: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-16280GPU DDK - Integer overflow in _PMRLogicalOffsetToPhysicalOffset
    39Monitor
  • CVE-2025-13952GPU DDK - libusc UAF via WebGPU shaders at MergeConsecutiveBarriersBP
    39Monitor
  • CVE-2026-21732GPU DDK - libusc OOB write at ConvertSwitchToArrayLookupBP during WebGPU shader compilation
    38Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-22167May 1, 2026 · GPU DDK - Cache resident PM buffers writable by other GPU requestors, leading to arbitrary write to physical memory
    31Monitor
  • ← EarlierCVE-2026-34193Jun 1, 2026 · GPU DDK - Arbitrary write via UFO updates due insufficient pointer validation in rgxfw_to_ptr()
    17Monitor
  • Later →CVE-2026-45195Jun 26, 2026 · GPU DDK - rgxfw_set_mips_fault_address(&psInit->sFaultPhysAddr) is untrusted
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-2173298 days apartGPU DDK - libusc OOB write at ConvertSwitchToArrayLookupBP during WebGPU shader compilation
    38Monitor
  • CVE-2025-0467435 days apartGPU DDK - rgxfw_hwperf_get_packet_buffer OOB write
    32Monitor
  • CVE-2026-4974428 days apartGPU DDK - Unchecked ui32TracePointer in rgxfw_log_ex()
    31Monitor
  • CVE-2026-4974528 days apartGPU DDK - Unvalidated sHWPerfCtlDMABuf GPU-VA, DMA-write into FW privdata via MMU ctx 0
    31Monitor
  • CVE-2026-3419325 days apartGPU DDK - Arbitrary write via UFO updates due insufficient pointer validation in rgxfw_to_ptr()
    17Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-823 · Use of Out-of-range Pointer Offset

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records