CVE-2026-43495 (GCVE-0-2026-43495)

Vulnerability from cvelistv5 – Published: 2026-05-21 12:12 – Updated: 2026-05-21 12:12
VLAI?
Title
net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: da45d2566a1d4e260b894ff5d96be64b21c7fa79 , < f94450ce5053b36002995b72d1fa1db3bb08c5bf (git)
Affected: da45d2566a1d4e260b894ff5d96be64b21c7fa79 , < 9855e063e063158cc5bded576382599dc3133202 (git)
Affected: da45d2566a1d4e260b894ff5d96be64b21c7fa79 , < 2b56d7903ab804481f5233a259d5f341e9fd513c (git)
Affected: da45d2566a1d4e260b894ff5d96be64b21c7fa79 , < dd4f4c93c1488d7100b9964f2da4c8b3c29652f1 (git)
Affected: da45d2566a1d4e260b894ff5d96be64b21c7fa79 , < 0e7c074cfcd9bd93765505f9eb8b42f03ed2a744 (git)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc3 , ≤ * (original_commit_for_fix)
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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "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_ctrl_msg.c",
            "drivers/net/wwan/t7xx/t7xx_port_proxy.h"
          ],
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          "vendor": "Linux",
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              "status": "unaffected",
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            {
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              "status": "unaffected",
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              "versionType": "semver"
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            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "7.1-rc3",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-21T12:12:45.988Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f94450ce5053b36002995b72d1fa1db3bb08c5bf"
        },
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          "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",
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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": "2026-05-21T12:12:45.988Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
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  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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