{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68427", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.392Z", "datePublished": "2026-08-10T12:04:47.915Z", "dateUpdated": "2026-08-19T16:35:22.452Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:35:22.452Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "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" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/host1x/bus.c" ], "versions": [ { "version": "af755456299d44e4ed6af3b7c70a7f03ea37fdf1", "lessThan": "86a9bd8c8f422d5f3079da31e151868902fcc702", "status": "affected", "versionType": "git" }, { "version": "71c017b3f83ff72638f2a1b1d6d4e7bc61d30231", "lessThan": "abeff53233b984571b87582bb588b4b38ef4ea50", "status": "affected", "versionType": "git" }, { "version": "0e9dd7cfb9986b78cc81eca126ccfbf57f4c0602", "lessThan": "5b7e5f84d3d4cea10c3764d2da274810a7934228", "status": "affected", "versionType": "git" }, { "version": "8c0d3cf0d5108c96317e0eca92b60dd368867cef", "lessThan": "5f4de3c717d34a24d555af581947742980778c02", "status": "affected", "versionType": "git" }, { "version": "df63c76f9c8d881ca7bce1aecfba512328d0527d", "lessThan": "b773faa32b0a98c3eb2b50d96de631681e5d1157", "status": "affected", "versionType": "git" }, { "version": "3cbf5e3c46e66d9b3b6b91099bb720c6cb1be3bc", "lessThan": "266cddf7bd0f6c79b6c0633aef742a22bf70265b", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/host1x/bus.c" ], "versions": [ { "version": "6.1.178", "lessThan": "6.1.183", "status": "affected", "versionType": "semver" }, { "version": "6.6.145", "lessThan": "6.6.148", "status": "affected", "versionType": "semver" }, { "version": "6.12.97", "lessThan": "6.12.101", "status": "affected", "versionType": "semver" }, { "version": "6.18.40", "lessThan": "6.18.42", "status": "affected", "versionType": "semver" }, { "version": "7.1.5", "lessThan": "7.1.6", "status": "affected", "versionType": "semver" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.178", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.145", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.97", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.40", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1.5", "versionEndExcluding": "7.1.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/86a9bd8c8f422d5f3079da31e151868902fcc702" }, { "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" } } } }