{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-46741", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-09-11T15:12:18.263Z", "datePublished": "2024-09-18T07:12:02.496Z", "dateUpdated": "2026-08-27T12:39:34.666Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-27T12:39:34.666Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: Fix double free of 'buf' in error path\n\nsmatch warning:\ndrivers/misc/fastrpc.c:1926 fastrpc_req_mmap() error: double free of 'buf'\n\nIn fastrpc_req_mmap() error path, the fastrpc buffer is freed in\nfastrpc_req_munmap_impl() if unmap is successful.\n\nBut in the end, there is an unconditional call to fastrpc_buf_free().\nSo the above case triggers the double free of fastrpc buf." } ], "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 code is reached only via `ioctl(FASTRPC_IOCTL_MMAP)` on the `/dev/fastrpc-*` misc device node, requiring local access to the system. No network or remote peer input reaches this path.\nAC:L - The attacker deterministically forces the error path by passing a read-only user mapping as `argp`, so `copy_from_user()` succeeds but the final `copy_to_user()` returns `-EFAULT`, and the subsequent DSP munmap of the just-mapped buffer always succeeds — no race or uncontrolled condition is involved.\nPR:L - The fastrpc driver contains no `capable()` or `CAP_*` checks on any path to `fastrpc_req_mmap()`; any local user able to open the fastrpc device node (routinely granted to unprivileged applications on Qualcomm Android/embedded/laptop systems) can trigger it.\nUI:N - The attacking process performs the entire sequence itself with two ioctls and its own memory mapping; no action by another user or victim is required.\nS:U - The corruption is confined to the kernel's own slab and DMA/CMA allocators within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The second `fastrpc_buf_free()` reads `buf->dev/size/virt/phys` from freed slab memory, and the duplicated `dma_free_coherent()` releases pages that remain mappable to userspace via this driver's dma-buf `.mmap`, allowing an attacker-mapped page to be re-issued to another kernel consumer and read — an arbitrary kernel-memory disclosure primitive.\nI:H - A same-object double free poisons the SLUB freelist so the same chunk is handed out to two owners, yielding overlapping-object heap corruption and, together with the still-mapped doubly-freed DMA pages, an arbitrary kernel write suitable for privilege escalation.\nA:H - Even without successful exploitation the double free corrupts the slab and page allocators, and on kernels with SLUB debugging or freelist hardening it trips an immediate BUG, causing a kernel panic that any local user can trigger at will." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/misc/fastrpc.c" ], "versions": [ { "version": "13327ed95222e70fa98805382b65636b872d87cb", "lessThan": "4753cc37b6606ef9a7ec22861d380d45e2707f9a", "status": "affected", "versionType": "git" }, { "version": "72fa6f7820c4cf96c5f7aabc4e54bdf52d1e2ac2", "lessThan": "f77dc8a75859e559f3238a6d906206259227985e", "status": "affected", "versionType": "git" }, { "version": "72fa6f7820c4cf96c5f7aabc4e54bdf52d1e2ac2", "lessThan": "bfc1704d909dc9911a558b1a5833d3d61a43a1f2", "status": "affected", "versionType": "git" }, { "version": "72fa6f7820c4cf96c5f7aabc4e54bdf52d1e2ac2", "lessThan": "e8c276d4dc0e19ee48385f74426aebc855b49aaf", "status": "affected", "versionType": "git" }, { "version": "911737ad0c860251f640a05feb75f9dc7e41f0d7", "status": "affected", "versionType": "git" }, { "version": "b10e064ca0f708c4b4401ac5eab0f76cf7cec93d", "status": "affected", "versionType": "git" }, { "version": "5.10.267", "lessThan": "5.11", "status": "affected", "versionType": "semver" }, { "version": "5.15.218", "lessThan": "5.16", "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/misc/fastrpc.c" ], "versions": [ { "version": "6.2", "status": "affected" }, { "version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.51", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.10", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "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": "6.2", "versionEndExcluding": "6.6.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.10.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.267" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.218" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/4753cc37b6606ef9a7ec22861d380d45e2707f9a" }, { "url": "https://git.kernel.org/stable/c/f77dc8a75859e559f3238a6d906206259227985e" }, { "url": "https://git.kernel.org/stable/c/bfc1704d909dc9911a558b1a5833d3d61a43a1f2" }, { "url": "https://git.kernel.org/stable/c/e8c276d4dc0e19ee48385f74426aebc855b49aaf" } ], "title": "misc: fastrpc: Fix double free of 'buf' in error path", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-09-29T14:50:16.910976Z", "id": "CVE-2024-46741", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-29T14:50:31.769Z" } } ] } }