thunderbolt: Reject oversized XDomain properties responses

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98687
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:22 UTC
Updated2026-10-21 13:21:37 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: thunderbolt: Reject oversized XDomain properties responses tb_xdp_properties_request() allocates room for 45 data dwords in its 252-byte response buffer. The XDomain length field is six bits wide, however, and a malicious peer can set it to 63. After the fixed response fields are subtracted, the driver treats this as 48 data dwords. Commit 322e93448d90 ("thunderbolt: Clamp XDomain response data copy to allocation size") only bounds the copy against data_len. If data_len is at least 48, memcpy() reads 192 bytes from the 180-byte res->data array, causing a 12-byte heap out-of-bounds read. Commit 4db2bd2ed478 ("thunderbolt: Limit XDomain response copy to actual frame size") limits the earlier copy but does not constrain this header-derived length. Reject response data lengths that exceed the allocated source buffer before copying them into the assembled property block.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.057130000 (date 2026-10-21)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d1ff70241a275133e1a0258b7c23588b122276c8 b270c1074860de74da0d6b5250fb06b359b9d509 git Not specified
CNA Linux Linux affected d1ff70241a275133e1a0258b7c23588b122276c8 a766a86ff48acee76aeb8e2575771040749e509d git Not specified
CNA Linux Linux affected d1ff70241a275133e1a0258b7c23588b122276c8 2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa git Not specified
CNA Linux Linux affected d1ff70241a275133e1a0258b7c23588b122276c8 737a1d2e9642d5f718bd29aa4a98b9eef3832f0a git Not specified
CNA Linux Linux affected d1ff70241a275133e1a0258b7c23588b122276c8 80756e263846ab694984e749e8c626897331438f git Not specified
CNA Linux Linux affected 4.15 Not specified
CNA Linux Linux unaffected 4.15 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b270c1074860de74da0d6b5250fb06b359b9d509 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a766a86ff48acee76aeb8e2575771040749e509d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/737a1d2e9642d5f718bd29aa4a98b9eef3832f0a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/80756e263846ab694984e749e8c626897331438f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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