{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-27401", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-25T13:47:42.681Z", "datePublished": "2024-05-13T10:29:53.862Z", "dateUpdated": "2026-08-05T11:29:34.613Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:29:34.613Z" }, "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." } ], "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 µs, 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 — 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 — 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": "4ee0941da10e8fdcdb34756b877efd3282594c1f", "status": "affected", "versionType": "git" }, { "version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "1fe60ee709436550f8cfbab01295936b868d5baa", "status": "affected", "versionType": "git" }, { "version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "539d51ac48bcfcfa1b3d4a85f8df92fa22c1d41c", "status": "affected", "versionType": "git" }, { "version": "286468210d83ce0ca1e37e346ed9f4457a161650", "lessThan": "38762a0763c10c24a4915feee722d7aa6e73eb98", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/firewire/nosy.c" ], "versions": [ { "version": "2.6.36", "status": "affected" }, { "version": "0", "lessThan": "2.6.36", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.314", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.276", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.217", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.159", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.91", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.31", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.10", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "2.6.36", "versionEndExcluding": "4.19.314" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "5.4.276" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "5.10.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "5.15.159" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "6.1.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "6.6.31" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "6.8.10" }, { "vulnerable": true, "criteria": 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