thunderbolt: property: Reject u32 wrap in tb_property_entry_valid()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63893
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:06 UTC
Updated2026-07-20 15:16:54 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.002100000 probability, percentile 0.113660000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 6a63623621639acbb39bc2d9fb09559681716695 git Not specified
CNA Linux Linux affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36 git Not specified
CNA Linux Linux affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 9fee50c4e1e42f6d3cbe30df584f9f648f626071 git Not specified
CNA Linux Linux affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 8d4a758b407ab3de3be86d1ceadfa35d717d30c7 git Not specified
CNA Linux Linux affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 5c06a3043ad944f087bb2ae0aae28d820bb9f460 git Not specified
CNA Linux Linux affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 31b98e503ecca8077e5247253dd5425ab84bc96d git Not specified
CNA Linux Linux affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 a47784aee77f33f786dc5d7375db821bdae68792 git Not specified
CNA Linux Linux affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 01deda0152066c6c955f0619114ea6afa070aaec git Not specified
CNA Linux Linux affected 4.15 Not specified
CNA Linux Linux unaffected 4.15 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9fee50c4e1e42f6d3cbe30df584f9f648f626071 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8d4a758b407ab3de3be86d1ceadfa35d717d30c7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/01deda0152066c6c955f0619114ea6afa070aaec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5c06a3043ad944f087bb2ae0aae28d820bb9f460 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/31b98e503ecca8077e5247253dd5425ab84bc96d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a47784aee77f33f786dc5d7375db821bdae68792 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6a63623621639acbb39bc2d9fb09559681716695 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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