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drm/bridge: tc358767: clamp the reported AUX read size to the request

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: drm/bridge: tc358767: clamp the reported AUX read size to the request tc_aux_transfer() clamps an AUX read to the payload limit: size_t size = min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES - 1, msg->size); After the transfer it replaces size with the byte count the controller reports in AUX_BYTES: if (size) size = FIELD_GET(AUX_BYTES, auxstatus); AUX_BYTES is GENMASK(15, 8), so it can be up to 255. Nothing clamps it back to the request. tc_aux_read_data() reads that many bytes into the 16-byte auxrdata stack buffer, then copies them into the caller buffer. A reported count of 255 makes the read run to 256 bytes and overruns both. The controller should never report more than it was asked to transfer, so this is defense in depth rather than a live hole. The reported count is only lightly trusted, and the check is cheap. Clamp it back to the request, the same way ti-sn65dsi86 does in commit aca58eac52b8 ("drm/bridge: ti-sn65dsi86: Never store more than msg->size bytes in AUX xfer").

Announced Source revision 1
Original source ↗

CVE-2026-93067

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-2026-93067

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": "12dfe7c4d9c53442efcb4113cff505f60d654906",
        "lessThan": "ebf00c51c9ac9188e2806a2b842418805ee879be",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "12dfe7c4d9c53442efcb4113cff505f60d654906",
        "lessThan": "424b762cc26d512e3e7421e57e41b4b55be2400b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "12dfe7c4d9c53442efcb4113cff505f60d654906",
        "lessThan": "dd6274706bec30d005bff0587a4262d01dc2775a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "12dfe7c4d9c53442efcb4113cff505f60d654906",
        "lessThan": "982caa744fce79d18f2920382aaeb0da821a6e73",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "12dfe7c4d9c53442efcb4113cff505f60d654906",
        "lessThan": "33c0b072e31dee98a754d9bd01800359dfeb9e8f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "12dfe7c4d9c53442efcb4113cff505f60d654906",
        "lessThan": "57c567e0e8aa76f6e3e8f39d7f40c20bc37e76af",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "12dfe7c4d9c53442efcb4113cff505f60d654906",
        "lessThan": "9ff718df547372d70ca20ad8e66a3fb1300936b2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "12dfe7c4d9c53442efcb4113cff505f60d654906",
        "lessThan": "ec6444a00c49e6c2b5e9a507272a28126677f9ee",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/gpu/drm/bridge/tc358767.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.4"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.4",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/gpu/drm/bridge/tc358767.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93067

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#37802 · Revision 1
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Publisher date
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