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Linux azure: In the Linux kernel, the following vulnerability has been resolved: thunderbolt: property: Cap recursion depth in __tb_property_parse_dir() A… (CVE-2026-63891)

0
Medium
Published: 07/20/2026 (07/20/2026, 00:00:00 UTC)
Source: GCVE Database
Product: linux-azure

Description

In the Linux kernel, the following vulnerability has been resolved: thunderbolt: property: Cap recursion depth in __tb_property_parse_dir() A DIRECTORY entry's value field is used as the dir_offset for a recursive call into __tb_property_parse_dir() with no depth counter. A crafted peer that chains DIRECTORY entries into a back-reference loop drives the parser until the kernel stack is exhausted and the guard page fires. Any untrusted XDomain peer (cable, dock, in-line inspector, adjacent host) that reaches the PROPERTIES_REQUEST control-plane exchange can trigger this without authentication. Thread a depth counter through tb_property_parse() and __tb_property_parse_dir(), and reject blocks that exceed TB_PROPERTY_MAX_DEPTH = 8. That is comfortably larger than any observed legitimate XDomain layout. Operators who do not need XDomain host-to-host discovery can disable the path entirely with thunderbolt.xdomain=0 on the kernel command line.

Affected software

Affected versions
<7.0.0-28.28~24.04.1<7.0.0-1016.16~24.04.1<7.0.0-28.28.1~24.04.3<7.0.0-28.28<7.0.0-1009.9

Technical Details

Gcve Source
db.gcve.eu
Osv Id
GHSA-67r4-fvhf-7vqf
Osv Schema Version
1.4.0
Aliases
["CVE-2026-63891"]
Ecosystems
[]
Database Specific Severity
null
Cvss Version
null

Threat ID: 6a5d27ab2a4a8d598912ffa7

Added to database: 07/19/2026, 19:38:19 UTC

Last enriched: 07/19/2026, 20:12:16 UTC

Last updated: 09/03/2026, 22:52:13 UTC

Views: 59

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