{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23448", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.020Z", "datePublished": "2026-04-03T15:15:31.488Z", "dateUpdated": "2026-04-03T15:15:31.488Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-04-03T15:15:31.488Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check\n\ncdc_ncm_rx_verify_ndp16() validates that the NDP header and its DPE\nentries fit within the skb. The first check correctly accounts for\nndpoffset:\n\n if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len)\n\nbut the second check omits it:\n\n if ((sizeof(struct usb_cdc_ncm_ndp16) +\n ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len)\n\nThis validates the DPE array size against the total skb length as if\nthe NDP were at offset 0, rather than at ndpoffset. When the NDP is\nplaced near the end of the NTB (large wNdpIndex), the DPE entries can\nextend past the skb data buffer even though the check passes.\ncdc_ncm_rx_fixup() then reads out-of-bounds memory when iterating\nthe DPE array.\n\nAdd ndpoffset to the nframes bounds check and use struct_size_t() to\nexpress the NDP-plus-DPE-array size more clearly."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/usb/cdc_ncm.c"], "versions": [{"version": "ff06ab13a4ccae4acb44a2d4e3ece367b616ab50", "lessThan": "f1c7701d3ac91b62d672c13690cf295821f0d5c3", "status": "affected", "versionType": "git"}, {"version": "ff06ab13a4ccae4acb44a2d4e3ece367b616ab50", "lessThan": "789204f980730258c983102c027c375238009c80", "status": "affected", "versionType": "git"}, {"version": "ff06ab13a4ccae4acb44a2d4e3ece367b616ab50", "lessThan": "403f94ddcb36c552fbef51dea735b131e3dcde8b", "status": "affected", "versionType": "git"}, {"version": "ff06ab13a4ccae4acb44a2d4e3ece367b616ab50", "lessThan": "dce9dda0e3707e887977db44407989e9ead26611", "status": "affected", "versionType": "git"}, {"version": "ff06ab13a4ccae4acb44a2d4e3ece367b616ab50", "lessThan": "2aa8a4fa8d5b7d0e1ebcec100e1a4d80a1f4b21a", "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/net/usb/cdc_ncm.c"], "versions": [{"version": "3.8", "status": "affected"}, {"version": "0", "lessThan": "3.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.20", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.10", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0-rc5", "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": "3.8", "versionEndExcluding": "6.6.130"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.12.78"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.18.20"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.19.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "7.0-rc5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f1c7701d3ac91b62d672c13690cf295821f0d5c3"}, {"url": "https://git.kernel.org/stable/c/789204f980730258c983102c027c375238009c80"}, {"url": "https://git.kernel.org/stable/c/403f94ddcb36c552fbef51dea735b131e3dcde8b"}, {"url": "https://git.kernel.org/stable/c/dce9dda0e3707e887977db44407989e9ead26611"}, {"url": "https://git.kernel.org/stable/c/2aa8a4fa8d5b7d0e1ebcec100e1a4d80a1f4b21a"}], "title": "net: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check\n\ncdc_ncm_rx_verify_ndp16() validates that the NDP header and its DPE\nentries fit within the skb. The first check correctly accounts for\nndpoffset:\n\n if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len)\n\nbut the second check omits it:\n\n if ((sizeof(struct usb_cdc_ncm_ndp16) +\n ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len)\n\nThis validates the DPE array size against the total skb length as if\nthe NDP were at offset 0, rather than at ndpoffset. When the NDP is\nplaced near the end of the NTB (large wNdpIndex), the DPE entries can\nextend past the skb data buffer even though the check passes.\ncdc_ncm_rx_fixup() then reads out-of-bounds memory when iterating\nthe DPE array.\n\nAdd ndpoffset to the nframes bounds check and use struct_size_t() to\nexpress the NDP-plus-DPE-array size more clearly."}], "id": "CVE-2026-23448", "lastModified": "2026-04-07T13:21:09.600", "metrics": {}, "published": "2026-04-03T16:16:30.863", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2aa8a4fa8d5b7d0e1ebcec100e1a4d80a1f4b21a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/403f94ddcb36c552fbef51dea735b131e3dcde8b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/789204f980730258c983102c027c375238009c80"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dce9dda0e3707e887977db44407989e9ead26611"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f1c7701d3ac91b62d672c13690cf295821f0d5c3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: net: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check", "id": "2454858", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454858"}, "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-1285", "details": ["A flaw was found in the Linux kernel's cdc_ncm module. An incorrect bounds check in the cdc_ncm_rx_verify_ndp16() function, responsible for validating Network Data Protocol (NDP) entries, allows Datagram Pointer Entries (DPE) to extend beyond the intended buffer. This can lead to an out-of-bounds read when cdc_ncm_rx_fixup() processes these entries, potentially resulting in information disclosure or a denial of service."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, prevent the cdc_ncm module from being loaded. See https://access.redhat.com/solutions/41278 for instructions. Note this will disable USB CDC NCM network devices."}, "name": "CVE-2026-23448", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23448\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23448\nhttps://lore.kernel.org/linux-cve-announce/2026040315-CVE-2026-23448-1d79@gregkh/T"], "statement": "This vulnerability affects systems using USB CDC NCM (Network Control Model) devices such as USB tethering adapters and mobile broadband modems. Exploitation requires either a malicious USB device or crafted network packets to a connected CDC NCM device. The out-of-bounds read could leak kernel memory or cause a crash.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ff06ab13a4ccae4acb44a2d4e3ece367b616ab50,f1c7701d3ac91b62d672c13690cf295821f0d5c3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ff06ab13a4ccae4acb44a2d4e3ece367b616ab50,789204f980730258c983102c027c375238009c80)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ff06ab13a4ccae4acb44a2d4e3ece367b616ab50,403f94ddcb36c552fbef51dea735b131e3dcde8b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ff06ab13a4ccae4acb44a2d4e3ece367b616ab50,dce9dda0e3707e887977db44407989e9ead26611)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ff06ab13a4ccae4acb44a2d4e3ece367b616ab50,2aa8a4fa8d5b7d0e1ebcec100e1a4d80a1f4b21a)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,3.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.130,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.78,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.20,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.10,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "analysis": {"en": {"generated_at": "2026-04-07T10:10:52.080292+00:00", "value": {"mitigation_remediation": ["Update the Linux kernel to a release that includes the corrected bounds check for the CDC\u2011NCM driver.", "If a timely kernel upgrade is not possible, permanently disable the CDC\u2011NCM module by removing the module from the boot configuration or adding a blacklist entry.", "Alternatively, restrict USB CDC\u2011NCM devices using udev rules to prevent the driver from loading for those devices.", "Monitor kernel mailing lists and vendor advisories for any additional recommendations or stop\u2011gap measures."], "summary": {"action": "Apply Patch", "impact": "Kernel Out\u2011of\u2011Bounds Read"}, "threat_synthesis": {"affected_systems": "All Linux kernel builds that enable the CDC\u2011NCM USB network interface are affected. The vulnerability is present in any kernel revision prior to the commit that corrected the bounds check; specific upstream version ranges are not listed in the advisory.", "description_and_impact": "The Linux kernel\u2019s CDC NCM driver performs an improper validation of the Network Data Packet (NDP) header and its Data Packet Entry (DPE) array. When the NDP is located near the end of the Non\u2011Temporal Buffer (NTB), the driver checks only the NDP size but neglects the offset before validating the DPE array size. This mis\u2011calculation can allow memory reads beyond the end of the packet buffer, exposing kernel memory contents. The out\u2011of\u2011bounds read occurs during packet processing and can result in information disclosure or a crash.", "risk_and_exploitability": "The CVSS score of 5.5 indicates moderate severity, while the EPSS score of less than 1% and absence from the CISA KEV catalog suggest low exploitation likelihood. The flaw requires the attacker to provide a malicious USB packet to a device presenting a CDC\u2011NCM interface, implying local or physically trusted access rather than a purely remote exploit. Even if exploited, the impact is limited to memory disclosure or local denial of service, without privilege escalation."}}}}, "created": "2026-04-03T21:13:49.757670+00:00", "updated": "2026-04-08T19:53:55.356289+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}