CVE-2022-4696

Description

There exists a use-after-free vulnerability in the Linux kernel through io_uring and the IORING_OP_SPLICE operation. If IORING_OP_SPLICE is missing the IO_WQ_WORK_FILES flag, which signals that the operation won't use current->nsproxy, so its reference counter is not increased. This assumption is not always true as calling io_splice on specific files will call the get_uts function which will use current->nsproxy leading to invalidly decreasing its reference counter later causing the use-after-free vulnerability. We recommend upgrading to version 5.10.160 or above

Weakness classification

• CWE-416: Use After Free
• CWE-763: Release of Invalid Pointer or Reference

Primary references

• cve-coordination@google.com — Mailing List, Patch, Vendor Advisory
• cve-coordination@google.com — Exploit, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Patch, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory