Answer in brief
CVE-2026-98687 records a Unknown severity vulnerability in thunderbolt: Reject oversized XDomain properties responses. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d1ff70241a275133e1a0258b7c23588b122276c8 <a766a86ff48acee76aeb8e2575771040749e509d || >=d1ff70241a275133e1a0258b7c23588b122276c8 <2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa || >=d1ff70241a275133e1a0258b7c23588b122276c8 <737a1d2e9642d5f718bd29aa4a98b9eef3832f0a || >=d1ff70241a275133e1a0258b7c23588b122276c8 <80756e263846ab694984e749e8c626897331438f | a766a86ff48acee76aeb8e2575771040749e509d, 2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa, 737a1d2e9642d5f718bd29aa4a98b9eef3832f0a, 80756e263846ab694984e749e8c626897331438f |
| Linux/Linuxgeneric | 4.15 | Not reported |
| Linux/Linuxgeneric | >=d1ff70241a275133e1a0258b7c23588b122276c8 <b270c1074860de74da0d6b5250fb06b359b9d509 || >=d1ff70241a275133e1a0258b7c23588b122276c8 <a766a86ff48acee76aeb8e2575771040749e509d || >=d1ff70241a275133e1a0258b7c23588b122276c8 <2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa || >=d1ff70241a275133e1a0258b7c23588b122276c8 <737a1d2e9642d5f718bd29aa4a98b9eef3832f0a || >=d1ff70241a275133e1a0258b7c23588b122276c8 <80756e263846ab694984e749e8c626897331438f | b270c1074860de74da0d6b5250fb06b359b9d509, a766a86ff48acee76aeb8e2575771040749e509d, 2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa, 737a1d2e9642d5f718bd29aa4a98b9eef3832f0a, 80756e263846ab694984e749e8c626897331438f |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
In 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.
Quoted source text, attributed separately from HOL analysis.