{"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"}}]}}