{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43495", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.013Z", "datePublished": "2026-05-21T12:12:45.988Z", "dateUpdated": "2026-08-05T12:28:18.825Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:28:18.825Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "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↔modem 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 — 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" } } ] } }