{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-47087", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-29T22:33:44.299Z", "datePublished": "2024-03-04T18:10:17.107Z", "dateUpdated": "2026-08-05T08:45:56.013Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:45:56.013Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntee: optee: Fix incorrect page free bug\n\nPointer to the allocated pages (struct page *page) has already\nprogressed towards the end of allocation. It is incorrect to perform\n__free_pages(page, order) using this pointer as we would free any\narbitrary pages. Fix this by stop modifying the page pointer." } ], "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 - Reachable only via local ioctl (TEE_IOC_SHM_ALLOC) on /dev/tee[0-9]*, the OP-TEE client character device; not exposed over the network.\nAC:L - An attacker who can open the TEE client device can reliably force the shm_register failure path (e.g., by exhausting OP-TEE dynamic SHM registration capacity or inducing allocation failure after alloc_pages succeeds), which triggers the incorrect __free_pages().\nPR:L - /dev/tee0 is the unprivileged client interface with no capability check in the driver; access is DAC-only and commonly granted to non-root teeclnt/group users or TEE client apps on Android/embedded deployments.\nUI:N - Exploitation requires only opening the device and issuing TEE_IOC_SHM_ALLOC; no victim action is needed.\nS:U - The incorrect free corrupts Normal-World kernel memory within the same OS security authority; this is standard local kernel privilege escalation, not a TrustZone/VM boundary escape.\nC:H - __free_pages() on the advanced page pointer frees unrelated in-use pages, enabling use-after-free of attacker-influenced heap objects and arbitrary kernel memory disclosure.\nI:H - Arbitrary page free yields classic UAF/heap corruption primitives that can be turned into arbitrary write and control-flow hijacking in the kernel.\nA:H - Freeing pages still owned by other kernel allocations causes oops/panic or allocator corruption and can crash the system even without a full exploit." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/tee/optee/core.c" ], "versions": [ { "version": "3c712f14d8a9354a8807c15c64c8dd334499cc42", "lessThan": "806142c805cacd098e61bdc0f72c778a2389fe4a", "status": "affected", "versionType": "git" }, { "version": "1340dc3fb75ea69221f4f5dcb0cbace55ad0331c", "lessThan": "ad338d825e3f7b96ee542bf313728af2d19fe9ad", "status": "affected", "versionType": "git" }, { "version": "ec185dd3ab257dc2a60953fdf1b6622f524cc5b7", "lessThan": "91e94e42f6fc49635f1a16d8ae3f79552bcfda29", "status": "affected", "versionType": "git" }, { "version": "ec185dd3ab257dc2a60953fdf1b6622f524cc5b7", "lessThan": "18549bf4b21c739a9def39f27dcac53e27286ab5", "status": "affected", "versionType": "git" }, { "version": "255e17923b22cb7abd026e044416d61f6bd0eec0", "status": "affected", "versionType": "git" }, { "version": "5.4.140", "lessThan": "5.4.169", "status": "affected", "versionType": "semver" }, { "version": "5.10.58", "lessThan": "5.10.89", "status": "affected", "versionType": "semver" }, { "version": "5.13.10", "lessThan": "5.14", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/tee/optee/core.c" ], "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.169", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.89", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.12", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.140", "versionEndExcluding": "5.4.169" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.58", "versionEndExcluding": "5.10.89" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "5.15.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "5.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/806142c805cacd098e61bdc0f72c778a2389fe4a" }, { "url": "https://git.kernel.org/stable/c/ad338d825e3f7b96ee542bf313728af2d19fe9ad" }, { "url": "https://git.kernel.org/stable/c/91e94e42f6fc49635f1a16d8ae3f79552bcfda29" }, { "url": "https://git.kernel.org/stable/c/18549bf4b21c739a9def39f27dcac53e27286ab5" } ], "title": "tee: optee: Fix incorrect page free bug", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2021-47087", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-03-06T20:26:26.296406Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:13:35.356Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:24:39.851Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/806142c805cacd098e61bdc0f72c778a2389fe4a", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/ad338d825e3f7b96ee542bf313728af2d19fe9ad", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/91e94e42f6fc49635f1a16d8ae3f79552bcfda29", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/18549bf4b21c739a9def39f27dcac53e27286ab5", "tags": [ "x_transferred" ] } ] } ] } }