CVE-2026-81009: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: c265ae75f900cea4e415230a77b5d152377627dd преди 417e02f7b6051765b91cf1289071882eebd172e0; c265ae75f900cea4e415230a77b5d152377627dd преди 2b8ad4981ecedb14c1fdd811ab977010b23933e6; c265ae75f900cea4e415230a77b5d152377627dd преди ba77efee1b95b4ad7559b1cdbe7cd7fa36dca95b
• Linux Linux: 6.18; преди 6.18; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-81009
• https://nvd.nist.gov/vuln/detail/CVE-2026-81009
• https://git.kernel.org/stable/c/417e02f7b6051765b91cf1289071882eebd172e0
• https://git.kernel.org/stable/c/2b8ad4981ecedb14c1fdd811ab977010b23933e6
• https://git.kernel.org/stable/c/ba77efee1b95b4ad7559b1cdbe7cd7fa36dca95b