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
References
| Link | Resource |
|---|---|
| https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.10.y&id=75454b4bbfc7e6a4dd8338556f36ea9107ddf61a | Mailing List Patch Vendor Advisory |
| https://kernel.dance/#75454b4bbfc7e6a4dd8338556f36ea9107ddf61a | Exploit Third Party Advisory |
Configurations
History
07 Nov 2023, 03:58
| Type | Values Removed | Values Added |
|---|---|---|
| Summary | 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 |
Information
Published : 2023-01-11 13:15
Updated : 2024-02-28 19:51
NVD link : CVE-2022-4696
Mitre link : CVE-2022-4696
CVE.ORG link : CVE-2022-4696
JSON object : View
Products Affected
linux
- linux_kernel