{"api_version":"1","generated_at":"2026-08-18T11:34:49+00:00","cve":"CVE-2026-68427","urls":{"html":"https://cve.report/CVE-2026-68427","api":"https://cve.report/api/cve/CVE-2026-68427.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68427","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68427"},"summary":{"title":"gpu: host1x: Fix use-after-free in host1x_bo_clear_cached_mappings","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ngpu: host1x: Fix use-after-free in host1x_bo_clear_cached_mappings\n\n__host1x_bo_unpin() drops the last reference to the mapping and frees\nit, so we can't dereference mapping afterwards. The cache itself\noutlives the mapping, so use the cache local variable instead.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-10 13:20:36","updated_at":"2026-08-18 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68427","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 71c017b3f83ff72638f2a1b1d6d4e7bc61d30231 abeff53233b984571b87582bb588b4b38ef4ea50 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0e9dd7cfb9986b78cc81eca126ccfbf57f4c0602 5b7e5f84d3d4cea10c3764d2da274810a7934228 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8c0d3cf0d5108c96317e0eca92b60dd368867cef 5f4de3c717d34a24d555af581947742980778c02 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected df63c76f9c8d881ca7bce1aecfba512328d0527d b773faa32b0a98c3eb2b50d96de631681e5d1157 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"68427","cve":"CVE-2026-68427","epss":"0.001250000","percentile":"0.026030000","score_date":"2026-08-17","updated_at":"2026-08-18 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the Linux kernel, the following vulnerability has been resolved:\n\ngpu: host1x: Fix use-after-free in host1x_bo_clear_cached_mappings\n\n__host1x_bo_unpin() drops the last reference to the mapping and frees\nit, so we can't dereference mapping afterwards. The cache itself\noutlives the mapping, so use the cache local variable instead."}],"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 vulnerable path is reached only through the Tegra DRM/KMS device node (/dev/dri/card0): a local process pins a GEM buffer as a scanout framebuffer via an atomic commit and then destroys the handle, invoking tegra_bo_free_object() -> host1x_bo_clear_cached_mappings(). No network or remote input reaches this code.\nAC:L - The use-after-free is unconditional and deterministic — every cached mapping freed by host1x_bo_clear_cached_mappings() is dereferenced again for the mutex_unlock. No race must be won and no special memory layout is needed; the attacker fully controls buffer creation, scanout pinning, and the destroy that triggers the free.\nPR:L - An unprivileged local user with access to the Tegra DRM device (video/graphics group, the logged-in console/compositor user on Android, automotive and embedded Tegra systems) can create GEM buffers, present them on a plane and free them. No root or CAP_SYS_ADMIN is required.\nUI:N - The attacking process performs the whole sequence itself — GEM allocation, atomic plane commit, and handle destruction — with no action by any other user or victim process.\nS:U - The corruption stays within the kernel's own memory and security authority; there is no crossing into another VM, IOMMU domain, or sandbox boundary.\nC:H - The freed host1x_bo_mapping is read after kfree() to obtain the cache pointer; with slab reuse the attacker can groom the freed object so the read returns attacker-influenced data, and the resulting UAF primitive can be leveraged to disclose kernel memory contents.\nI:H - mutex_unlock() writes to the lock word at the address read from freed memory, so a reallocated/poisoned mapping object yields a write through an attacker-influenceable pointer — a classic UAF write primitive usable for heap corruption and control-flow hijacking.\nA:H - Dereferencing the freed mapping reliably oopses under slab poisoning/KASAN, and unlocking a bogus mutex address corrupts kernel state, causing a panic or hang; the sequence can be repeated at will to keep the system down."}]}],"providerMetadata":{"dateUpdated":"2026-08-18T06:56:00.655Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/abeff53233b984571b87582bb588b4b38ef4ea50"},{"url":"https://git.kernel.org/stable/c/5b7e5f84d3d4cea10c3764d2da274810a7934228"},{"url":"https://git.kernel.org/stable/c/5f4de3c717d34a24d555af581947742980778c02"},{"url":"https://git.kernel.org/stable/c/b773faa32b0a98c3eb2b50d96de631681e5d1157"},{"url":"https://git.kernel.org/stable/c/266cddf7bd0f6c79b6c0633aef742a22bf70265b"}],"title":"gpu: host1x: Fix use-after-free in host1x_bo_clear_cached_mappings","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-68427","datePublished":"2026-08-10T12:04:47.915Z","dateReserved":"2026-07-30T09:28:09.392Z","dateUpdated":"2026-08-18T06:56:00.655Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-10 13:20:36","lastModifiedDate":"2026-08-18 07:16:51","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":"2026","CveId":"68427","Ordinal":"1","Title":"gpu: host1x: Fix use-after-free in host1x_bo_clear_cached_mappin","CVE":"CVE-2026-68427","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"68427","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ngpu: host1x: Fix use-after-free in host1x_bo_clear_cached_mappings\n\n__host1x_bo_unpin() drops the last reference to the mapping and frees\nit, so we can't dereference mapping afterwards. The cache itself\noutlives the mapping, so use the cache local variable instead.","Type":"Description","Title":"gpu: host1x: Fix use-after-free in host1x_bo_clear_cached_mappin"}]}}}