CVE-2026-63893 (GCVE-0-2026-63893)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-20 13:41
VLAI
Title
thunderbolt: property: Reject u32 wrap in tb_property_entry_valid()
Summary
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.
Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cdae7c07e3e3509eaabc18c1640a55dc5b99c179 , < 6a63623621639acbb39bc2d9fb09559681716695 (git)
Affected: cdae7c07e3e3509eaabc18c1640a55dc5b99c179 , < e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36 (git)
Affected: cdae7c07e3e3509eaabc18c1640a55dc5b99c179 , < 9fee50c4e1e42f6d3cbe30df584f9f648f626071 (git)
Affected: cdae7c07e3e3509eaabc18c1640a55dc5b99c179 , < 8d4a758b407ab3de3be86d1ceadfa35d717d30c7 (git)
Affected: cdae7c07e3e3509eaabc18c1640a55dc5b99c179 , < 5c06a3043ad944f087bb2ae0aae28d820bb9f460 (git)
Affected: cdae7c07e3e3509eaabc18c1640a55dc5b99c179 , < 31b98e503ecca8077e5247253dd5425ab84bc96d (git)
Affected: cdae7c07e3e3509eaabc18c1640a55dc5b99c179 , < a47784aee77f33f786dc5d7375db821bdae68792 (git)
Affected: cdae7c07e3e3509eaabc18c1640a55dc5b99c179 , < 01deda0152066c6c955f0619114ea6afa070aaec (git)
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Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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    "dateReserved": "2026-07-19T07:54:57.019Z",
    "dateUpdated": "2026-07-20T13:41:16.262Z",
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A malicious XDomain peer can pick\\nvalue = 0xffffff00, length = 0x100 so the sum 0x100000000 wraps to 0\\nand passes the \u003e block_len check.  tb_property_parse() then passes\\nentry-\u003evalue to parse_dwdata() as a dword offset into the property\\nblock, reading attacker-directed memory far past the allocation.\\n\\nFor TEXT-typed entries with the \\\"deviceid\\\" or \\\"vendorid\\\" keys this\\nlands in xd-\u003edevice_name / xd-\u003evendor_name and is readable back via\\nthe per-XDomain device_name / vendor_name sysfs attributes; the leak\\nis NUL-bounded (kstrdup() stops at the first zero byte) and\\nuntargeted (the attacker picks a delta, not an absolute address).\\nDATA-typed entries are parsed into property-\u003evalue.data but not\\ngenerically surfaced to userspace.\\n\\nUse check_add_overflow() so a wrapped sum is 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  }
}



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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

Author Source Type Date Other

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.