{"api_version":"1","generated_at":"2026-06-02T17:31:02+00:00","cve":"CVE-2026-43495","urls":{"html":"https://cve.report/CVE-2026-43495","api":"https://cve.report/api/cve/CVE-2026-43495.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43495","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43495"},"summary":{"title":"net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler\n\nt7xx_port_enum_msg_handler() uses the modem-supplied port_count field as\na loop bound over port_msg->data[] without checking that the message buffer\ncontains sufficient data. 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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-21 13:16:18","updated_at":"2026-05-30 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43495","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected da45d2566a1d4e260b894ff5d96be64b21c7fa79 f94450ce5053b36002995b72d1fa1db3bb08c5bf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected da45d2566a1d4e260b894ff5d96be64b21c7fa79 9855e063e063158cc5bded576382599dc3133202 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected da45d2566a1d4e260b894ff5d96be64b21c7fa79 2b56d7903ab804481f5233a259d5f341e9fd513c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected da45d2566a1d4e260b894ff5d96be64b21c7fa79 dd4f4c93c1488d7100b9964f2da4c8b3c29652f1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"43495","cve":"CVE-2026-43495","epss":"0.000210000","percentile":"0.060580000","score_date":"2026-06-01","updated_at":"2026-06-02 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the Linux kernel, the following vulnerability has been resolved:\n\nnet: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler\n\nt7xx_port_enum_msg_handler() uses the modem-supplied port_count field as\na loop bound over port_msg->data[] without checking that the message buffer\ncontains sufficient data. 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":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-05-30T10:45:12.397Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43495","datePublished":"2026-05-21T12:12:45.988Z","dateReserved":"2026-05-01T14:12:56.013Z","dateUpdated":"2026-05-30T10:45:12.397Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-21 13:16:18","lastModifiedDate":"2026-05-30 11:17:06","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43495","Ordinal":"1","Title":"net: wwan: t7xx: validate port_count against message length in t","CVE":"CVE-2026-43495","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43495","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler\n\nt7xx_port_enum_msg_handler() uses the modem-supplied port_count field as\na loop bound over port_msg->data[] without checking that the message buffer\ncontains sufficient data. 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.","Type":"Description","Title":"net: wwan: t7xx: validate port_count against message length in t"}]}}}