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wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: wifi: at76c50x-usb: avoid length underflow in at76_guess_freq() at76_guess_freq() checks only that the received frame is at least a bare 802.11 header (24 bytes) before subtracting the fixed management-body offset: len -= el_off; For both beacon and probe response frames, el_off is 36. If the frame is shorter than el_off, subtracting it causes the calculated IE length to wrap. The length is eventually passed to cfg80211_find_elem_match() as a very large unsigned value, so the element walk runs beyond the RX skb. This path is reached from at76_rx_tasklet() while scanning. If the device delivers a truncated beacon or probe response, the oversized IE length causes an out-of-bounds read during scanning. Skip the IE lookup if the frame does not reach the variable elements, before subtracting el_off.

Announced Source revision 1
Original source ↗

CVE-2026-68373

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-68373

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "1264b951463a00efebe1bb596499aaad620ec8af",
        "lessThan": "cb831aff2f850f72bc5ff5ad77d0a70bb5a84061",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1264b951463a00efebe1bb596499aaad620ec8af",
        "lessThan": "4875680d1703f56afa6257ba30244f2fb44ed205",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1264b951463a00efebe1bb596499aaad620ec8af",
        "lessThan": "b406f33d234f98c8b310fdab5cbb492d85e98e49",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1264b951463a00efebe1bb596499aaad620ec8af",
        "lessThan": "e165a1d295e7e814e13b0f92c86e5d48309509ce",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1264b951463a00efebe1bb596499aaad620ec8af",
        "lessThan": "bcde7249d45f52f994a9872bedf45994472ade77",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1264b951463a00efebe1bb596499aaad620ec8af",
        "lessThan": "fb1b50ab699211e777dca5ccfb648788b6a6e519",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1264b951463a00efebe1bb596499aaad620ec8af",
        "lessThan": "f742d9c98b5c504fc9e6744eef13a721c2aea486",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1264b951463a00efebe1bb596499aaad620ec8af",
        "lessThan": "61a799ffd1e5a4fd3702d547828b7ff3d161468e",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/wireless/atmel/at76c50x-usb.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.30"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.30",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.148",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.101",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.42",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/wireless/atmel/at76c50x-usb.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-68373

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41704 · Revision 1
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Publisher date
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