CVE-2022-4696
There exists a use-after-free vulnerability in the Linux kernel through io_uring and the IORING_OP_SPLICE operation.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.43%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.43% probability · 37th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-763, CWE-416
- Affected
- netapp/h410s firmware · netapp/h410c firmware · netapp/h700s firmware · netapp/h500s firmware · netapp/h300s firmware · linux/linux kernel
- Source
- cve-coordination@google.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.