CVE-2022-4696
Last modified
CVE-2022-4696 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.41% chance of exploitation in the next 30 days.
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
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Netapp | H410s Firmware | All versions |
| Netapp | H410c Firmware | All versions |
| Netapp | H700s Firmware | All versions |
| Netapp | H500s Firmware | All versions |
| Netapp | H300s Firmware | All versions |
| Linux | Linux Kernel | >= 5.4, < 5.10.160 |
| Linux | Linux Kernel | >= 5.11, < 5.12 |
References
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.10.y&id=75454b4bbfc7e6a4dd8338556f36ea9107ddf61aMailing List, Patch, Vendor Advisory
- https://kernel.dance/#75454b4bbfc7e6a4dd8338556f36ea9107ddf61aExploit, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.10.y&id=75454b4bbfc7e6a4dd8338556f36ea9107ddf61aMailing List, Patch, Vendor Advisory
- https://kernel.dance/#75454b4bbfc7e6a4dd8338556f36ea9107ddf61aExploit, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230223-0003/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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