{"schemaVersion":3,"id":"CVE-2026-21732","aliases":[],"status":"published","duplicateOf":null,"title":"GPU DDK - libusc OOB write at ConvertSwitchToArrayLookupBP during WebGPU shader compilation","description":"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.\n\n\n\nAn edge case using a very large value in switch statements in GPU shader code can cause a segmentation fault in the GPU shader compiler due to an out-of-bounds write access.","dates":{"published":"2026-03-20T22:48:42.695Z","modified":"2026-03-23T15:03:50.302Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.6,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.6,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.6,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00299,"percentile":0.21435,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0.010999999999999985,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.00288},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00299,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00299,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00299,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00299,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00299,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00299,"percentile":0.21435}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00288,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00299,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00299,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00299,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00299,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00299,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00299,"percentile":0.21435}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-823","name":"Use of Out-of-range Pointer Offset","description":"The product performs pointer arithmetic on a valid pointer, but it uses an offset that can point outside of the intended range of valid memory locations for the resulting pointer.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/823.html"},{"id":"CWE-787","name":"Out-of-bounds Write","description":"The product writes data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/787.html"}],"affected":[{"vendor":"imagination technologies","product":"graphics ddk","name":"Graphics DDK","label":"graphics ddk","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"23.2 RTM","noFixRecorded":false,"fixedIn":null},{"text":"≥ 24.1 RTM, ≤ 25.1 RTM","noFixRecorded":false,"fixedIn":null}],"versionsText":"23.2 RTM | ≥ 24.1 RTM, ≤ 25.1 RTM","eol":null,"hubHref":"/vendor/imagination_technologies/graphics_ddk"},{"vendor":"imaginationtech","product":"ddk","name":"ddk","label":"ddk","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 24.1, ≤ 25.1","noFixRecorded":false,"fixedIn":null},{"text":"1.17","noFixRecorded":false,"fixedIn":null},{"text":"1.18","noFixRecorded":false,"fixedIn":null},{"text":"23.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 24.1, ≤ 25.1 | 1.17 | 1.18 | 23.2","eol":null,"hubHref":"/vendor/imaginationtech/ddk"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.imaginationtech.com/gpu-driver-vulnerabilities/","label":"www.imaginationtech.com/gpu-driver-vulnerabilities/","hostname":"www.imaginationtech.com","tags":["Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-03-20T22:48:42.695Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-03-23T15:03:50.302Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T17:59:46.799Z","stale":false,"partial":false}}