CVE-2024-46741

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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 \u2014 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 \u2014 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"}}]}}

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Pero al final, hay una llamada incondicional a fastrpc_buf_free(). Por lo tanto, el caso anterior activa la doble liberaci\u00f3n del b\u00fafer fastrpc."}], "id": "CVE-2024-46741", "lastModified": "2026-08-27T13:16:32.990", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-46741", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-29T14:50:16.910976Z", "version": "2.0.3"}}]}, "published": "2024-09-18T08:15:03.430", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4753cc37b6606ef9a7ec22861d380d45e2707f9a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bfc1704d909dc9911a558b1a5833d3d61a43a1f2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e8c276d4dc0e19ee48385f74426aebc855b49aaf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f77dc8a75859e559f3238a6d906206259227985e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: misc: fastrpc: Fix double free of 'buf' in error path", "id": "2313089", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2313089"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-415", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmisc: fastrpc: Fix double free of 'buf' in error path\nsmatch warning:\ndrivers/misc/fastrpc.c:1926 fastrpc_req_mmap() error: double free of 'buf'\nIn fastrpc_req_mmap() error path, the fastrpc buffer is freed in\nfastrpc_req_munmap_impl() if unmap is successful.\nBut in the end, there is an unconditional call to fastrpc_buf_free().\nSo the above case triggers the double free of fastrpc buf."], "name": "CVE-2024-46741", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-09-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-46741\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-46741\nhttps://lore.kernel.org/linux-cve-announce/2024091835-CVE-2024-46741-4ce7@gregkh/T"], "statement": "This issue of double free may not allow attacker to write to an arbitrary kernel memory (I:N).", "threat_severity": "Moderate"}

{}