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CVE-2026-74263 (GCVE-0-2026-74263)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:16
VLAI
Title
net: wwan: t7xx: check skb_clone in control TX
Summary
In the Linux kernel, the following vulnerability has been resolved: net: wwan: t7xx: check skb_clone in control TX t7xx_port_ctrl_tx() clones each skb fragment before passing it to the port transmit path. The clone is used immediately to set cloned->len, so an skb_clone() failure results in a NULL pointer dereference. Check the clone before using it. If previous fragments were already queued, preserve the driver's existing partial-write behavior by returning the number of bytes submitted so far.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 36bd28c1cb0dbf48645cfe43159907fb3253b33a , < 7edd4db82f9429591de10be4c904c817f12ba029 (git)
Affected: 36bd28c1cb0dbf48645cfe43159907fb3253b33a , < 112490467586146d323cb7230b1d72137e36900c (git)
Affected: 36bd28c1cb0dbf48645cfe43159907fb3253b33a , < f7aebaee2961bfcb86f282202d3dbd9b69db1a7c (git)
Affected: 36bd28c1cb0dbf48645cfe43159907fb3253b33a , < 4c1b25d85f4c9a0f85f3f8c39988ad266a3f3095 (git)
Affected: 36bd28c1cb0dbf48645cfe43159907fb3253b33a , < 05f789fa90d95d5771230e78453cedff2486039d (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wwan/t7xx/t7xx_port_wwan.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "6.4"
            },
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
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                },
                {
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                },
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                  "versionEndExcluding": "7.2",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: wwan: t7xx: check skb_clone in control TX\n\nt7xx_port_ctrl_tx() clones each skb fragment before passing it to the\nport transmit path. The clone is used immediately to set cloned-\u003elen, so\nan skb_clone() failure results in a NULL pointer dereference.\n\nCheck the clone before using it. If previous fragments were already\nqueued, preserve the driver\u0027s existing partial-write behavior by\nreturning the number of bytes submitted so far."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:16:05.593Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7edd4db82f9429591de10be4c904c817f12ba029"
        },
        {
          "url": "https://git.kernel.org/stable/c/112490467586146d323cb7230b1d72137e36900c"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7aebaee2961bfcb86f282202d3dbd9b69db1a7c"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c1b25d85f4c9a0f85f3f8c39988ad266a3f3095"
        },
        {
          "url": "https://git.kernel.org/stable/c/05f789fa90d95d5771230e78453cedff2486039d"
        }
      ],
      "title": "net: wwan: t7xx: check skb_clone in control TX",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74263",
    "datePublished": "2026-08-15T05:57:39.660Z",
    "dateReserved": "2026-08-15T05:44:03.877Z",
    "dateUpdated": "2026-08-17T05:16:05.593Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74263",
      "date": "2026-09-04",
      "epss": "0.00168",
      "percentile": "0.0631"
    },
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-19T19:43:02+00:00",
      "cve": "CVE-2026-74263",
      "id": "CVE-2026-74263",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: wwan: t7xx: check skb_clone in control TX",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74263.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.