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CVE-2026-53149: thunderbolt: Bound root directory content to block size

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-25 · updated 2026-10-15
• Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Bound root directory content to block size __tb_property_parse_dir() does not check that content_offset + content_len fits within block_len for the root directory case. When rootdir->length equals or exceeds block_len - 2, the entry loop reads past the allocated property block. Add a bounds check after computing content_offset and content_len to reject directories whose content extends past the block.

Affected products

• Linux kernel: from 4.15 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36 — fixed in 5.10.259, 5.15.210, 6.1.176, 6.12.94, 6.18.36, 6.6.143

How to fix

Upgrade to a fixed version: Linux kernel 5.10.259, 5.15.210, 6.1.176, 6.12.94. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0a32040a48db8cf35de48b85d6115df5623e4964
• https://git.kernel.org/stable/c/1912be23daf4afc8d24ce916021ab68ca4c679db
• https://git.kernel.org/stable/c/4d0b1524caadb04c10a71f3f88692c63dcb39115
• https://git.kernel.org/stable/c/5c7657d38d07268124782f03519f07c22a5814fb
• https://git.kernel.org/stable/c/60ba6217460792356a238299edd675d91d46bab4
• https://git.kernel.org/stable/c/65423079c7420e3dbf9a7aa345c243a3f5752e5d
• https://git.kernel.org/stable/c/b212bc161d8a9937b42153723a4a3f2f74fab528
• https://git.kernel.org/stable/c/cbeb68cbaa0a6f979ef428a7f2d0268c082ba166
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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