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Thunderbolt: Zero-Length Property Entries Cause Data Corruption
published 4 months ago
Summary
A Linux kernel bug could cause data corruption on Thunderbolt devices when a zero-length text property entry is sent. This bug has been fixed, but users should update their Linux kernel to prevent potential issues. No action is required if you are running the latest version of the kernel.
What to do
- Update linux kernel to version 7.0.13.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Linux | linux | kernel |
>= 6.19.0, < 7.0.13 Fix: upgrade to 7.0.13
|
Original advisory text
thunderbolt: Reject zero-length property entries in validator
In the Linux kernel, the following vulnerability has been resolved:
thunderbolt: Reject zero-length property entries in validator
tb_property_entry_valid() accepts entries with length == 0 for
DIRECTORY, DATA, and TEXT types. A zero-length TEXT entry passes
validation but causes an underflow in the null-termination logic:
property->value.text[property->length * 4 - 1] = '\0';
When property->length is 0 this writes to offset -1 relative to
the allocation.
Reject zero-length entries early in the validator since they have no
valid representation in the XDomain property protocol.
thunderbolt: Reject zero-length property entries in validator
tb_property_entry_valid() accepts entries with length == 0 for
DIRECTORY, DATA, and TEXT types. A zero-length TEXT entry passes
validation but causes an underflow in the null-termination logic:
property->value.text[property->length * 4 - 1] = '\0';
When property->length is 0 this writes to offset -1 relative to
the allocation.
Reject zero-length entries early in the validator since they have no
valid representation in the XDomain property protocol.
References
- https://git.kernel.org/stable/c/2e0ddac549ebd713eb9f4a15b6496e3440a17d8b URL
- https://git.kernel.org/stable/c/35d6c9252a152e756768a26dbf216b9dd9dd8e92 URL
- https://git.kernel.org/stable/c/3b6e68cb97f725385010264a873e14a3921b6b8a URL
- https://git.kernel.org/stable/c/581c2053ab4dbe27e83c9e62deb4c73aa8dc0c3a URL
- https://git.kernel.org/stable/c/5f56bc6bddffe8710ba0ba8844023b5a44ca90e4 URL
- https://git.kernel.org/stable/c/99d9dbad1463afb510d42c9714f846361d1b726d URL
- https://git.kernel.org/stable/c/ca11e7da4fba4b394f69e16448f4463c44c84de6 URL
- https://git.kernel.org/stable/c/cff8eb65d1eafe7793e54b4d0cf6bf831644630b URL
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53150... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-53150 Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git Product
Timeline
Published25 Jun 2026
Updated28 Jul 2026
First seen28 Jul 2026
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