{"api_version":"1","generated_at":"2026-10-25T20:42:01+00:00","cve":"CVE-2025-68735","urls":{"html":"https://cve.report/CVE-2025-68735","api":"https://cve.report/api/cve/CVE-2025-68735.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-68735","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-68735"},"summary":{"title":"drm/panthor: Prevent potential UAF in group creation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/panthor: Prevent potential UAF in group creation\n\nThis commit prevents the possibility of a use after free issue in the\nGROUP_CREATE ioctl function, which arose as pointer to the group is\naccessed in that ioctl function after storing it in the Xarray.\nA malicious userspace can second guess the handle of a group and try\nto call GROUP_DESTROY ioctl from another thread around the same time\nas GROUP_CREATE ioctl.\n\nTo prevent the use after free exploit, this commit uses a mark on an\nentry of group pool Xarray which is added just before returning from\nthe GROUP_CREATE ioctl function. The mark is checked for all ioctls\nthat specify the group handle and so userspace won't be abe to delete\na group that isn't marked yet.\n\nv2: Add R-bs and fixes tags","state":"PUBLISHED","assigner":"Linux","published_at":"2025-12-24 13:16:28","updated_at":"2026-10-21 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the Linux kernel, the following vulnerability has been resolved:\n\ndrm/panthor: Prevent potential UAF in group creation\n\nThis commit prevents the possibility of a use after free issue in the\nGROUP_CREATE ioctl function, which arose as pointer to the group is\naccessed in that ioctl function after storing it in the Xarray.\nA malicious userspace can second guess the handle of a group and try\nto call GROUP_DESTROY ioctl from another thread around the same time\nas GROUP_CREATE ioctl.\n\nTo prevent the use after free exploit, this commit uses a mark on an\nentry of group pool Xarray which is added just before returning from\nthe GROUP_CREATE ioctl function. The mark is checked for all ioctls\nthat specify the group handle and so userspace won't be abe to delete\na group that isn't marked yet.\n\nv2: Add R-bs and fixes tags"}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The flaw is reached through concurrent GROUP_CREATE and GROUP_DESTROY ioctls on a Panthor DRM device node, making it locally exploitable.\nAC:L - The attacker controls both racing threads, handles are predictably allocated from a 1–128 range, and attacker-controlled queue allocations widen the repeatable race window.\nPR:L - Both ioctls have DRM_RENDER_ALLOW, and low or medium group priorities require no capability; a basic unprivileged process with render-node access suffices.\nUI:N - The attacker directly issues the concurrent ioctls without requiring any action from another user.\nS:U - The corruption affects the host kernel within the same security authority and represents standard local privilege escalation, not a VM or IOMMU-boundary escape.\nC:H - The group can be freed and reclaimed while creation continues dereferencing stale pointers, providing exploitable heap corruption that can enable arbitrary kernel-memory disclosure.\nI:H - Post-free operations write queue pointers, counters, list links, locks, and task metadata into reclaimed memory, enabling arbitrary corruption and potential control-flow hijacking.\nA:H - Concurrent cleanup can free the group and associated resources while they remain in use, allowing repeatable kernel crashes, oopses, or panics."}]}],"providerMetadata":{"dateUpdated":"2026-10-21T12:38:25.918Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/c6bbec068a9accd6f1df05f3df9a5254c99292ee"},{"url":"https://git.kernel.org/stable/c/deb8b2491f6b9882ae02d7dc2651c7bf4f3b7e05"},{"url":"https://git.kernel.org/stable/c/c646ebff3fa571e7ea974235286fb9ed3edc260c"},{"url":"https://git.kernel.org/stable/c/eec7e23d848d2194dd8791fcd0f4a54d4378eecd"}],"title":"drm/panthor: Prevent potential UAF in group creation","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2025-68735","datePublished":"2025-12-24T12:09:34.364Z","dateReserved":"2025-12-24T10:30:51.028Z","dateUpdated":"2026-10-21T12:38:25.918Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-12-24 13:16:28","lastModifiedDate":"2026-10-21 13:18:24","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"68735","Ordinal":"1","Title":"drm/panthor: Prevent potential UAF in group creation","CVE":"CVE-2025-68735","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"68735","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/panthor: Prevent potential UAF in group creation\n\nThis commit prevents the possibility of a use after free issue in the\nGROUP_CREATE ioctl function, which arose as pointer to the group is\naccessed in that ioctl function after storing it in the Xarray.\nA malicious userspace can second guess the handle of a group and try\nto call GROUP_DESTROY ioctl from another thread around the same time\nas GROUP_CREATE ioctl.\n\nTo prevent the use after free exploit, this commit uses a mark on an\nentry of group pool Xarray which is added just before returning from\nthe GROUP_CREATE ioctl function. The mark is checked for all ioctls\nthat specify the group handle and so userspace won't be abe to delete\na group that isn't marked yet.\n\nv2: Add R-bs and fixes tags","Type":"Description","Title":"drm/panthor: Prevent potential UAF in group creation"}]}}}