CVE-2026-81009
CVE CVE-2026-81009EUVD EUVD-2026-76332Published 2026-09-11T19:43:00.000Z
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: io_uring/query: cap user size passed to copy_struct_to_user io_handle_query_entry() clamps hdr.size for the inbound copy_from_user() but keeps the original user value as usize. copy_struct_to_user() uses that usize and, when it is larger than the kernel result, clear_user()s the trailing bytes. As hdr.size is a __u32, a query can request nearly 4 GiB of zeroing, including on the error path where res_size stays 0. The interface is reachable without a ring via IORING_REGISTER_QUERY. Reject sizes larger than PAGE_SIZE, as recommended for copy_struct_* interfaces.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 0; c265ae75f900cea4e415230a77b5d152377627dd <2b8ad4981ecedb14c1fdd811ab977010b23933e6; c265ae75f900cea4e415230a77b5d152377627dd <ba77efee1b95b4ad7559b1cdbe7cd7fa36dca95b; patch: 7.3-rc1; patch: 7.2.4; c265ae75f900cea4e415230a77b5d152377627dd <417e02f7b6051765b91cf1289071882eebd172e0; patch: 6.18.50; 6.18
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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