{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40004", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.151Z", "datePublished": "2025-10-20T05:26:08.787Z", "dateUpdated": "2025-12-01T06:16:17.602Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-12-01T06:16:17.602Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: Fix buffer overflow in USB transport layer\n\nA buffer overflow vulnerability exists in the USB 9pfs transport layer\nwhere inconsistent size validation between packet header parsing and\nactual data copying allows a malicious USB host to overflow heap buffers.\n\nThe issue occurs because:\n- usb9pfs_rx_header() validates only the declared size in packet header\n- usb9pfs_rx_complete() uses req->actual (actual received bytes) for\nmemcpy\n\nThis allows an attacker to craft packets with small declared size\n(bypassing validation) but large actual payload (triggering overflow\nin memcpy).\n\nAdd validation in usb9pfs_rx_complete() to ensure req->actual does not\nexceed the buffer capacity before copying data."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/9p/trans_usbg.c"], "versions": [{"version": "a3be076dc174d9022a71a12554feb4c97b5c4d5c", "lessThan": "0da18d49f874d444ad83c8a546fa33bfcf2f582c", "status": "affected", "versionType": "git"}, {"version": "a3be076dc174d9022a71a12554feb4c97b5c4d5c", "lessThan": "df8462f0fc045b4475dc494a5787a03c972ba2a2", "status": "affected", "versionType": "git"}, {"version": "a3be076dc174d9022a71a12554feb4c97b5c4d5c", "lessThan": "c04db81cd0288dfc68b7a0f7d09bd49b40bba451", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/9p/trans_usbg.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.53", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.3", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "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": "6.12", "versionEndExcluding": "6.12.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.17.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0da18d49f874d444ad83c8a546fa33bfcf2f582c"}, {"url": "https://git.kernel.org/stable/c/df8462f0fc045b4475dc494a5787a03c972ba2a2"}, {"url": "https://git.kernel.org/stable/c/c04db81cd0288dfc68b7a0f7d09bd49b40bba451"}], "title": "net/9p: Fix buffer overflow in USB transport layer", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: Fix buffer overflow in USB transport layer\n\nA buffer overflow vulnerability exists in the USB 9pfs transport layer\nwhere inconsistent size validation between packet header parsing and\nactual data copying allows a malicious USB host to overflow heap buffers.\n\nThe issue occurs because:\n- usb9pfs_rx_header() validates only the declared size in packet header\n- usb9pfs_rx_complete() uses req->actual (actual received bytes) for\nmemcpy\n\nThis allows an attacker to craft packets with small declared size\n(bypassing validation) but large actual payload (triggering overflow\nin memcpy).\n\nAdd validation in usb9pfs_rx_complete() to ensure req->actual does not\nexceed the buffer capacity before copying data."}], "id": "CVE-2025-40004", "lastModified": "2025-10-21T19:31:25.450", "metrics": {}, "published": "2025-10-20T06:15:36.280", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0da18d49f874d444ad83c8a546fa33bfcf2f582c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c04db81cd0288dfc68b7a0f7d09bd49b40bba451"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/df8462f0fc045b4475dc494a5787a03c972ba2a2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: net/9p: Fix buffer overflow in USB transport layer", "id": "2405052", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2405052"}, "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": ["No description is available for this CVE."], "name": "CVE-2025-40004", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "2025-10-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40004\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40004\nhttps://lore.kernel.org/linux-cve-announce/2025102012-CVE-2025-40004-a709@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-10-20T13:21:23.228090+00:00", "updated": "2025-10-20T13:21:23.228120+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}