CVE-2024-27401

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Helps prevent user space overflows."}], "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 vulnerability is triggered by a local `read(2)` syscall on the `/dev/nosy` character device, where the caller supplies the undersized `user_length` that the kernel then ignores. Although the overflowing bytes originate from the IEEE 1394 bus, the vulnerable code path itself is entered and controlled entirely through a local file-descriptor operation.\nAC:L - The attacker simply calls `read()` with a small `count` while any traffic is present on the snooped 1394 bus (cycle-start packets alone arrive every 125 \u00b5s, and a bus reset queues a packet), making the overflow reliably and repeatedly reproducible with no memory-layout or timing conditions outside the attacker's control.\nPR:L - `nosy.c` contains no capability or permission checks whatsoever \u2014 reachability is decided solely by the permissions on `/dev/nosy`, which on the developer, lab, embedded and protocol-analysis systems where this sniffer is deployed is routinely opened up to a non-root group or passed into a container. Choosing the higher-severity option between L and H, an ordinary unprivileged user with the device node is sufficient.\nUI:N - The attacker performs the `read()` themselves and needs no victim action; the overflow occurs as soon as a packet longer than the supplied buffer is dequeued. No mount, no file open by another user, no configuration change by an administrator is required.\nS:U - The out-of-bounds write lands inside the address space of the process that issued the `read()`, and the compromised resources belong to the same security authority as the vulnerable kernel component. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - `nosy_read()` returns a length greater than the requested `count`, so a caller following the standard read idiom consumes, prints, or logs memory located beyond its own buffer \u2014 an unbounded disclosure of adjacent process memory (heap pointers, keys, buffered data). The accompanying memory corruption is further leverageable to leak state from a privileged reader.\nI:H - Up to roughly 8 KB of externally supplied 1394 packet bytes are written past the end of the caller's stack or heap buffer, giving a large, content-controlled out-of-bounds write. Overwriting adjacent objects, saved registers, or function pointers in a nosy consumer that customarily runs as root yields control-flow hijack and arbitrary modification.\nA:H - The overflow reliably smashes adjacent memory and will SIGSEGV or abort the reading process (typically a root sniffer/logging daemon), and the copy can also fault mid-transfer leaving the buffer state inconsistent. Repeated triggering keeps the affected service permanently down."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/firewire/nosy.c"], "versions": [{"version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "67f34f093c0f7bf33f5b4ae64d3d695a3b978285", "status": "affected", "versionType": "git"}, {"version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "7b8c7bd2296e95b38a6ff346242356a2e7190239", "status": "affected", "versionType": "git"}, {"version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "cca330c59c54207567a648357835f59df9a286bb", "status": "affected", "versionType": "git"}, {"version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "79f988d3ffc1aa778fc5181bdfab312e57956c6b", "status": "affected", "versionType": "git"}, {"version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": 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"dataVersion": "5.2"}

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Although the overflowing bytes originate from the IEEE 1394 bus, the vulnerable code path itself is entered and controlled entirely through a local file-descriptor operation.\nAC:L - The attacker simply calls `read()` with a small `count` while any traffic is present on the snooped 1394 bus (cycle-start packets alone arrive every 125 \u00b5s, and a bus reset queues a packet), making the overflow reliably and repeatedly reproducible with no memory-layout or timing conditions outside the attacker's control.\nPR:L - `nosy.c` contains no capability or permission checks whatsoever \u2014 reachability is decided solely by the permissions on `/dev/nosy`, which on the developer, lab, embedded and protocol-analysis systems where this sniffer is deployed is routinely opened up to a non-root group or passed into a container. Choosing the higher-severity option between L and H, an ordinary unprivileged user with the device node is sufficient.\nUI:N - The attacker performs the `read()` themselves and needs no victim action; the overflow occurs as soon as a packet longer than the supplied buffer is dequeued. No mount, no file open by another user, no configuration change by an administrator is required.\nS:U - The out-of-bounds write lands inside the address space of the process that issued the `read()`, and the compromised resources belong to the same security authority as the vulnerable kernel component. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - `nosy_read()` returns a length greater than the requested `count`, so a caller following the standard read idiom consumes, prints, or logs memory located beyond its own buffer \u2014 an unbounded disclosure of adjacent process memory (heap pointers, keys, buffered data). The accompanying memory corruption is further leverageable to leak state from a privileged reader.\nI:H - Up to roughly 8 KB of externally supplied 1394 packet bytes are written past the end of the caller's stack or heap buffer, giving a large, content-controlled out-of-bounds write. Overwriting adjacent objects, saved registers, or function pointers in a nosy consumer that customarily runs as root yields control-flow hijack and arbitrary modification.\nA:H - The overflow reliably smashes adjacent memory and will SIGSEGV or abort the reading process (typically a root sniffer/logging daemon), and the copy can also fault mid-transfer leaving the buffer state inconsistent. Repeated triggering keeps the affected service permanently down."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "67f34f093c0f7bf33f5b4ae64d3d695a3b978285", "versionType": "git"}, {"status": "affected", "version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "7b8c7bd2296e95b38a6ff346242356a2e7190239", "versionType": "git"}, {"status": "affected", "version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "cca330c59c54207567a648357835f59df9a286bb", "versionType": "git"}, {"status": "affected", "version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "79f988d3ffc1aa778fc5181bdfab312e57956c6b", "versionType": "git"}, {"status": "affected", "version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "4ee0941da10e8fdcdb34756b877efd3282594c1f", "versionType": "git"}, {"status": "affected", "version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "1fe60ee709436550f8cfbab01295936b868d5baa", "versionType": "git"}, {"status": "affected", "version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "539d51ac48bcfcfa1b3d4a85f8df92fa22c1d41c", "versionType": "git"}, {"status": "affected", "version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "38762a0763c10c24a4915feee722d7aa6e73eb98", "versionType": "git"}], "programFiles": ["drivers/firewire/nosy.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.36"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.36", "versionType": "semver"}, {"status": "unaffected", "version": "4.19.314", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.276", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.217", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.159", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.91", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.31", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.8.10", "versionType": "semver", "lessThanOrEqual": "6.8.*"}, {"status": "unaffected", "version": "6.9", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/firewire/nosy.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/67f34f093c0f7bf33f5b4ae64d3d695a3b978285"}, {"url": "https://git.kernel.org/stable/c/7b8c7bd2296e95b38a6ff346242356a2e7190239"}, {"url": "https://git.kernel.org/stable/c/cca330c59c54207567a648357835f59df9a286bb"}, {"url": "https://git.kernel.org/stable/c/79f988d3ffc1aa778fc5181bdfab312e57956c6b"}, {"url": "https://git.kernel.org/stable/c/4ee0941da10e8fdcdb34756b877efd3282594c1f"}, {"url": "https://git.kernel.org/stable/c/1fe60ee709436550f8cfbab01295936b868d5baa"}, {"url": "https://git.kernel.org/stable/c/539d51ac48bcfcfa1b3d4a85f8df92fa22c1d41c"}, {"url": "https://git.kernel.org/stable/c/38762a0763c10c24a4915feee722d7aa6e73eb98"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirewire: nosy: ensure user_length is taken into account when fetching packet contents\n\nEnsure that packet_buffer_get respects the user_length provided. If\nthe length of the head packet exceeds the user_length, packet_buffer_get\nwill now return 0 to signify to the user that no data were read\nand a larger buffer size is required. Helps prevent user space overflows."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.314", "versionStartIncluding": "2.6.36"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.276", "versionStartIncluding": "2.6.36"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.217", "versionStartIncluding": "2.6.36"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.159", "versionStartIncluding": "2.6.36"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.91", "versionStartIncluding": "2.6.36"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.31", "versionStartIncluding": "2.6.36"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8.10", "versionStartIncluding": "2.6.36"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.9", "versionStartIncluding": "2.6.36"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:29:34.613Z"}}}, "cveMetadata": {"cveId": "CVE-2024-27401", "state": "PUBLISHED", "dateUpdated": "2026-08-05T11:29:34.613Z", "dateReserved": "2024-02-25T13:47:42.681Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-13T10:29:53.862Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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user_length provided. If\nthe length of the head packet exceeds the user_length, packet_buffer_get\nwill now return 0 to signify to the user that no data were read\nand a larger buffer size is required. Helps prevent user space overflows."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: firewire: nosy: aseg\u00farese de que se tenga en cuenta la longitud de usuario al recuperar el contenido del paquete. Aseg\u00farese de que paquete_buffer_get respete la longitud de usuario proporcionada. Si la longitud del paquete principal excede la longitud del usuario, paquete_buffer_get ahora devolver\u00e1 0 para indicarle al usuario que no se leyeron datos y que se requiere un tama\u00f1o de b\u00fafer mayor. Ayuda a evitar el desbordamiento del espacio del usuario."}], "id": "CVE-2024-27401", "lastModified": "2026-08-04T11:17:44.453", "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": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-27401", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-13T17:55:43.034157Z", "version": "2.0.3"}}]}, "published": "2024-05-14T15:12:29.623", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1fe60ee709436550f8cfbab01295936b868d5baa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/38762a0763c10c24a4915feee722d7aa6e73eb98"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4ee0941da10e8fdcdb34756b877efd3282594c1f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/539d51ac48bcfcfa1b3d4a85f8df92fa22c1d41c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/67f34f093c0f7bf33f5b4ae64d3d695a3b978285"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/79f988d3ffc1aa778fc5181bdfab312e57956c6b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7b8c7bd2296e95b38a6ff346242356a2e7190239"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cca330c59c54207567a648357835f59df9a286bb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1fe60ee709436550f8cfbab01295936b868d5baa"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/38762a0763c10c24a4915feee722d7aa6e73eb98"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4ee0941da10e8fdcdb34756b877efd3282594c1f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/539d51ac48bcfcfa1b3d4a85f8df92fa22c1d41c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/67f34f093c0f7bf33f5b4ae64d3d695a3b978285"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/79f988d3ffc1aa778fc5181bdfab312e57956c6b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7b8c7bd2296e95b38a6ff346242356a2e7190239"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cca330c59c54207567a648357835f59df9a286bb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DW2MIOIMOFUSNLHLRYX23AFR36BMKD65/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OTB4HWU2PTVW5NEYHHLOCXDKG3PYA534/"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: firewire: nosy: ensure user_length is taken into account when fetching packet contents", "id": "2280407", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2280407"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfirewire: nosy: ensure user_length is taken into account when fetching packet contents\nEnsure that packet_buffer_get respects the user_length provided. If\nthe length of the head packet exceeds the user_length, packet_buffer_get\nwill now return 0 to signify to the user that no data were read\nand a larger buffer size is required. Helps prevent user space overflows.", "A vulnerability was found in the Linux kernel's FireWire subsystem, which involves inadequate handling of the `user_length` parameter when fetching packet contents. This issue could potentially lead to security issues, such as unauthorized access or manipulation of memory."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-27401", "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": "2024-05-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-27401\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-27401\nhttps://lore.kernel.org/linux-cve-announce/2024051341-CVE-2024-27401-e31d@gregkh/T"], "statement": "Red Hat Enterprise Linux is not vulnerable to this CVE, as it does not affect the versions or configurations of the Linux kernel used in its distributions.", "threat_severity": "Moderate"}

{"created": "2025-07-13T11:31:25.497648+00:00", "updated": "2025-07-13T11:31:25.497714+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}