CVE-2026-43495 (GCVE-0-2026-43495)
Vulnerability from cvelistv5
Published
2026-05-21 12:12
Modified
2026-08-05 12:28
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler t7xx_port_enum_msg_handler() uses the modem-supplied port_count field as a loop bound over port_msg->data[] without checking that the message buffer contains sufficient data. A modem sending port_count=65535 in a 12-byte buffer triggers a slab-out-of-bounds read of up to 262140 bytes. Add a sizeof(*port_msg) check before accessing the port message header fields to guard against undersized messages. Add a struct_size() check after extracting port_count and before the loop. In t7xx_parse_host_rt_data(), guard the rt_feature header read with a remaining-buffer check before accessing data_len, validate feat_data_len against the actual remaining buffer to prevent OOB reads and signed integer overflow on offset. Pass msg_len from both call sites: skb->len at the DPMAIF path after skb_pull(), and the validated feat_data_len at the handshake path.
References
Impacted products
Vendor Product Version
Linux Linux Version: da45d2566a1d4e260b894ff5d96be64b21c7fa79
Version: da45d2566a1d4e260b894ff5d96be64b21c7fa79
Version: da45d2566a1d4e260b894ff5d96be64b21c7fa79
Version: da45d2566a1d4e260b894ff5d96be64b21c7fa79
Version: da45d2566a1d4e260b894ff5d96be64b21c7fa79
Version: da45d2566a1d4e260b894ff5d96be64b21c7fa79
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          "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"
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            "drivers/net/wwan/t7xx/t7xx_port_proxy.h"
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          "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-\u003edata[] 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-\u003elen at the DPMAIF path after\nskb_pull(), and the validated feat_data_len at the handshake path."
        }
      ],
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            "baseSeverity": "HIGH",
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              "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\u0027s 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)."
            }
          ]
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        "dateUpdated": "2026-08-05T12:28:18.825Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/307c5d0f36a5c74042217136da5bfbd9f7504650"
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        {
          "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"
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      ],
      "title": "net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43495",
    "datePublished": "2026-05-21T12:12:45.988Z",
    "dateReserved": "2026-05-01T14:12:56.013Z",
    "dateUpdated": "2026-08-05T12:28:18.825Z",
    "state": "PUBLISHED"
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