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VulnerabilityPublished

CVE-2026-63891: Linux kernel · thunderbolt: property: Cap recursion depth in __tb_property_parse_dir()

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 12 Nov 2026, 20:41 UTC

Severity
High

Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 19 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.

What to do

AI-suggested

The vulnerability is fixed by adding a recursion depth limit of 8 in the Thunderbolt property parser. Operators who do not require XDomain host-to-host discovery can disable this feature entirely by setting the kernel command line parameter thunderbolt.xdomain=0. No other immediate actions are required if the system is updated with the fix or the feature is disabled.

Description

A vulnerability in the Linux kernel's Thunderbolt property parser allows untrusted XDomain peers to trigger a stack exhaustion via recursive directory entries without authentication. This can cause a kernel stack overflow and trigger a guard page fault. The issue is addressed by limiting recursion depth to 8 and can be mitigated by disabling XDomain host-to-host discovery if not needed.

References

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