CVE-2026-43495

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A modem sending port_count=65535 in a 12-byte\nbuffer triggers a slab-out-of-bounds read of up to 262140 bytes.\n\nAdd a sizeof(*port_msg) check before accessing the port message header\nfields to guard against undersized messages.\n\nAdd a struct_size() check after extracting port_count and before the loop.\n\nIn t7xx_parse_host_rt_data(), guard the rt_feature header read with a\nremaining-buffer check before accessing data_len, validate feat_data_len\nagainst the actual remaining buffer to prevent OOB reads and signed\ninteger overflow on offset.\n\nPass msg_len from both call sites: skb->len at the DPMAIF path after\nskb_pull(), and the validated feat_data_len at the handshake path."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - The vulnerable parser consumes control messages supplied by the cellular modem/baseband over PCIe; the realistic worst-case attacker is a rogue base station / over-the-air baseband compromise that pivots to the host kernel, which is the cellular-radio analog of WiFi/Bluetooth adjacency. It is not directly Network-reachable because these are internal AP\u2194modem control messages, not internet-routable packets.\nAC:L - A malicious/compromised modem reliably triggers the OOB read by setting port_count to a large value (up to 65535) in an undersized buffer; there is no race or attacker-uncontrollable precondition, and the ~256 KB read reliably reaches unmapped memory.\nPR:N - The modem's messages are parsed automatically during the handshake/port-enumeration with no authentication or privilege check on the device-supplied data, so the attacker needs no host-side credentials.\nUI:N - Port enumeration and runtime-feature handshake are processed automatically by kernel threads at modem init and runtime; no user action is required.\nS:U - The vulnerable code and the impacted resource are both the host kernel; there is no crossing into a different security authority such as a VM/hypervisor or IOMMU domain.\nC:H - The flaw is a large slab-out-of-bounds read of up to ~256 KB of adjacent kernel heap, and the read values steer channel enable/disable behavior, providing a disclosure oracle \u2014 well above a few bounded bytes.\nI:H - The out-of-bounds data is interpreted as port_info and drives kernel driver channel enable/disable state, modifying kernel-internal state based on attacker-influenced out-of-bounds memory; rounding up under uncertainty.\nA:H - An out-of-bounds read of up to ~256 KB past a 12-byte slab object reliably crosses into unmapped/poisoned pages, causing a kernel oops/panic (denial of service)."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wwan/t7xx/t7xx_modem_ops.c", "drivers/net/wwan/t7xx/t7xx_port_ctrl_msg.c", "drivers/net/wwan/t7xx/t7xx_port_proxy.h"], "versions": [{"version": "da45d2566a1d4e260b894ff5d96be64b21c7fa79", "lessThan": "307c5d0f36a5c74042217136da5bfbd9f7504650", "status": "affected", "versionType": "git"}, {"version": "da45d2566a1d4e260b894ff5d96be64b21c7fa79", "lessThan": "f94450ce5053b36002995b72d1fa1db3bb08c5bf", "status": "affected", "versionType": "git"}, {"version": "da45d2566a1d4e260b894ff5d96be64b21c7fa79", "lessThan": "9855e063e063158cc5bded576382599dc3133202", "status": "affected", "versionType": "git"}, {"version": "da45d2566a1d4e260b894ff5d96be64b21c7fa79", "lessThan": "2b56d7903ab804481f5233a259d5f341e9fd513c", "status": "affected", "versionType": "git"}, {"version": "da45d2566a1d4e260b894ff5d96be64b21c7fa79", "lessThan": "dd4f4c93c1488d7100b9964f2da4c8b3c29652f1", "status": "affected", "versionType": "git"}, {"version": "da45d2566a1d4e260b894ff5d96be64b21c7fa79", "lessThan": "0e7c074cfcd9bd93765505f9eb8b42f03ed2a744", "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/wwan/t7xx/t7xx_modem_ops.c", "drivers/net/wwan/t7xx/t7xx_port_ctrl_msg.c", "drivers/net/wwan/t7xx/t7xx_port_proxy.h"], "versions": [{"version": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.88", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.30", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.7", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "5.19", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.6.140"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.12.88"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.18.30"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.0.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/307c5d0f36a5c74042217136da5bfbd9f7504650"}, {"url": "https://git.kernel.org/stable/c/f94450ce5053b36002995b72d1fa1db3bb08c5bf"}, {"url": "https://git.kernel.org/stable/c/9855e063e063158cc5bded576382599dc3133202"}, {"url": "https://git.kernel.org/stable/c/2b56d7903ab804481f5233a259d5f341e9fd513c"}, {"url": "https://git.kernel.org/stable/c/dd4f4c93c1488d7100b9964f2da4c8b3c29652f1"}, {"url": "https://git.kernel.org/stable/c/0e7c074cfcd9bd93765505f9eb8b42f03ed2a744"}], "title": "net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/06/18/1"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-06-18T18:47:33.811Z"}}]}}

{}

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A modem sending port_count=65535 in a 12-byte\nbuffer triggers a slab-out-of-bounds read of up to 262140 bytes.\n\nAdd a sizeof(*port_msg) check before accessing the port message header\nfields to guard against undersized messages.\n\nAdd a struct_size() check after extracting port_count and before the loop.\n\nIn t7xx_parse_host_rt_data(), guard the rt_feature header read with a\nremaining-buffer check before accessing data_len, validate feat_data_len\nagainst the actual remaining buffer to prevent OOB reads and signed\ninteger overflow on offset.\n\nPass msg_len from both call sites: skb->len at the DPMAIF path after\nskb_pull(), and the validated feat_data_len at the handshake path."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\nnet: wwan: t7xx: validar port_count contra la longitud del mensaje en t7xx_port_enum_msg_handler\n\nt7xx_port_enum_msg_handler() utiliza el campo port_count suministrado por el m\u00f3dem como l\u00edmite de bucle sobre port_msg->data[] sin verificar que el b\u00fafer del mensaje contenga datos suficientes. Un m\u00f3dem que env\u00eda port_count=65535 en un b\u00fafer de 12 bytes desencadena una lectura fuera de l\u00edmites de slab de hasta 262140 bytes.\n\nA\u00f1adir una verificaci\u00f3n sizeof(port_msg) antes de acceder a los campos de la cabecera del mensaje del puerto para proteger contra mensajes de tama\u00f1o insuficiente.\n\nA\u00f1adir una verificaci\u00f3n struct_size() despu\u00e9s de extraer port_count y antes del bucle.\n\nEn t7xx_parse_host_rt_data(), proteger la lectura de la cabecera rt_feature con una verificaci\u00f3n del b\u00fafer restante antes de acceder a data_len, validar feat_data_len contra el b\u00fafer restante real para prevenir lecturas OOB y desbordamiento de entero con signo en el desplazamiento.\n\nPasar msg_len desde ambos sitios de llamada: skb->len en la ruta DPMAIF despu\u00e9s de skb_pull(), y el feat_data_len validado en la ruta de handshake."}], "id": "CVE-2026-43495", "lastModified": "2026-07-23T16:10:00.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-21T13:16:18.847", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0e7c074cfcd9bd93765505f9eb8b42f03ed2a744"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2b56d7903ab804481f5233a259d5f341e9fd513c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/307c5d0f36a5c74042217136da5bfbd9f7504650"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9855e063e063158cc5bded576382599dc3133202"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dd4f4c93c1488d7100b9964f2da4c8b3c29652f1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f94450ce5053b36002995b72d1fa1db3bb08c5bf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "http://www.openwall.com/lists/oss-security/2026/06/18/1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler", "id": "2480452", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480452"}, "csaw": false, "cwe": "CWE-1284", "details": ["A flaw was found in the Linux kernel, specifically within the net: wwan: t7xx module. A malicious modem could exploit this vulnerability by sending a specially crafted message with an invalid port_count value. This could lead to a slab-out-of-bounds read, potentially allowing an attacker to access sensitive information or cause a system crash (Denial of Service)."], "name": "CVE-2026-43495", "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": "2026-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43495\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43495\nhttps://lore.kernel.org/linux-cve-announce/2026052155-CVE-2026-43495-9b17@gregkh/T"]}

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