{"id":"CVE-2026-98687","title":"thunderbolt: Reject oversized XDomain properties responses","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Reject oversized XDomain properties responses\n\ntb_xdp_properties_request() allocates room for 45 data dwords in its\n252-byte response buffer.  The XDomain …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= d1ff70241a275133e1a0258b7c23588b122276c8 < a766a86ff48acee76aeb8e2575771040749e509d","Linux >= d1ff70241a275133e1a0258b7c23588b122276c8 < 2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa","Linux >= d1ff70241a275133e1a0258b7c23588b122276c8 < 737a1d2e9642d5f718bd29aa4a98b9eef3832f0a","Linux >= d1ff70241a275133e1a0258b7c23588b122276c8 < 80756e263846ab694984e749e8c626897331438f","Linux 4.15"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:45:58.719Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98687","references":[{"url":"https://git.kernel.org/stable/c/a766a86ff48acee76aeb8e2575771040749e509d"},{"url":"https://git.kernel.org/stable/c/2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa"},{"url":"https://git.kernel.org/stable/c/737a1d2e9642d5f718bd29aa4a98b9eef3832f0a"},{"url":"https://git.kernel.org/stable/c/80756e263846ab694984e749e8c626897331438f"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.527Z","slug":"CVE-2026-98687","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Reject oversized XDomain properties responses\n\ntb_xdp_properties_request() allocates room for 45 data dwords in its\n252-byte response buffer.  The XDomain length field is six bits wide,\nhowever, and a malicious peer can set it to 63.  After the fixed response\nfields are subtracted, the driver treats this as 48 data dwords.\n\nCommit 322e93448d90 (\"thunderbolt: Clamp XDomain response data copy to\nallocation size\") only bounds the copy against data_len.  If data_len is\nat least 48, memcpy() reads 192 bytes from the 180-byte res->data array,\ncausing a 12-byte heap out-of-bounds read.  Commit 4db2bd2ed478\n(\"thunderbolt: Limit XDomain response copy to actual frame size\") limits\nthe earlier copy but does not constrain this header-derived length.\n\nReject response data lengths that exceed the allocated source buffer\nbefore copying them into the assembled property block.\n\n## Affected\n\n- `Linux >= d1ff70241a275133e1a0258b7c23588b122276c8 < a766a86ff48acee76aeb8e2575771040749e509d`\n- `Linux >= d1ff70241a275133e1a0258b7c23588b122276c8 < 2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa`\n- `Linux >= d1ff70241a275133e1a0258b7c23588b122276c8 < 737a1d2e9642d5f718bd29aa4a98b9eef3832f0a`\n- `Linux >= d1ff70241a275133e1a0258b7c23588b122276c8 < 80756e263846ab694984e749e8c626897331438f`\n- `Linux 4.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}