CVE-2023-0240
There is a logic error in io_uring's implementation which can be used to trigger a use-after-free vulnerability leading to privilege escalation.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.27%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
There is a logic error in io_uring's implementation which can be used to trigger a use-after-free vulnerability leading to privilege escalation. In the io_prep_async_work function the assumption that the last io_grab_identity call cannot return false is not true, and in this case the function will use the init_cred or the previous linked requests identity to do operations instead of using the current identity. This can lead to reference counting issues causing use-after-free. We recommend upgrading past version 5.10.161.
- 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
- 0.27% probability · 19th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- cve-coordination@google.com
References
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y&id=788d0824269bef539fe31a785b1517882eafed93Mailing List, Patch, Vendor Advisory
- https://github.com/gregkh/linux/commit/1e6fa5216a0e59ef02e8b6b40d553238a3b81d49Patch, Third Party Advisory
- https://kernel.dance/#788d0824269bef539fe31a785b1517882eafed93Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y&id=788d0824269bef539fe31a785b1517882eafed93Mailing List, Patch, Vendor Advisory
- https://github.com/gregkh/linux/commit/1e6fa5216a0e59ef02e8b6b40d553238a3b81d49Patch, Third Party Advisory
- https://kernel.dance/#788d0824269bef539fe31a785b1517882eafed93Patch, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230316-0001/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.