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thunderbolt: property: Reject u32 wrap in tb_property_entry_valid()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: thunderbolt: property: Reject u32 wrap in tb_property_entry_valid() entry->value is u32 and entry->length is u16; the sum is performed in u32 and wraps. A malicious XDomain peer can pick value = 0xffffff00, length = 0x100 so the sum 0x100000000 wraps to 0 and passes the > block_len check. tb_property_parse() then passes entry->value to parse_dwdata() as a dword offset into the property block, reading attacker-directed memory far past the allocation. For TEXT-typed entries with the "deviceid" or "vendorid" keys this lands in xd->device_name / xd->vendor_name and is readable back via the per-XDomain device_name / vendor_name sysfs attributes; the leak is NUL-bounded (kstrdup() stops at the first zero byte) and untargeted (the attacker picks a delta, not an absolute address). DATA-typed entries are parsed into property->value.data but not generically surfaced to userspace. Use check_add_overflow() so a wrapped sum is rejected.

Announced Source revision 1
Original source ↗

CVE-2026-63893

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-2026-63893

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": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
        "lessThan": "6a63623621639acbb39bc2d9fb09559681716695",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
        "lessThan": "e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
        "lessThan": "9fee50c4e1e42f6d3cbe30df584f9f648f626071",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
        "lessThan": "8d4a758b407ab3de3be86d1ceadfa35d717d30c7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
        "lessThan": "5c06a3043ad944f087bb2ae0aae28d820bb9f460",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
        "lessThan": "31b98e503ecca8077e5247253dd5425ab84bc96d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
        "lessThan": "a47784aee77f33f786dc5d7375db821bdae68792",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
        "lessThan": "01deda0152066c6c955f0619114ea6afa070aaec",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/thunderbolt/property.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.93",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.35",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.12",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/thunderbolt/property.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-63893

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40885 · Revision 1
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Publisher date
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