CVE-2026-53147
HIGH 8.1In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Validate XDomain request packet size before type cast tb_xdp_handle_request() casts the received packet buffer to protocol-specific structs without verifying that the allocation is large enough for the target type. A peer can send a minimal XDomain packet that passes the generic header length check but is shorter than the struct accessed after the cast, causing out-of- bounds reads from the kmemdup allocation. Plumb the packet length through xdomain_request_work and validate it against the expected struct size before each cast.
Severe if exploited (CVSS 8.1), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.3%chance of exploitation in 30 days · 20th percentile
Impact if exploited
8.1CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityNone
- AvailabilityHigh
What an attacker needs
- ⚠Access: Must sit on the same / adjacent network
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Weakness (CWE)
Not classified.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
References
Technical & other
- https://git.kernel.org/stable/c/a770e62923090d7572f1f5a8507ae551d354a057
- https://git.kernel.org/stable/c/0dd61ba03d05187726ecdf9c0e2175a81b9b24f6
- https://git.kernel.org/stable/c/79235c8add5da4bf27a12f5a5dbb579f300c059e
- https://git.kernel.org/stable/c/46da5c3ea011e884028a91cf913db093920a915b
- https://git.kernel.org/stable/c/07cd2787cdf8942d24a1a3ef81aa89b526fb6381
- https://git.kernel.org/stable/c/a504b9f2797b739e0304d537e8aa4ce883ecce39