An issue was discovered in can_can_gw_rcv in net/can/gw.c in the Linux kernel through 4.19.13. The CAN frame modification rules allow bitwise logical operations that can be also applied to the can_dlc field. Because of a missing check, the CAN drivers may write arbitrary content beyond the data registers in the CAN controller's I/O memory when processing can-gw manipulated outgoing frames. This is related to cgw_csum_xor_rel. An unprivileged user can trigger a system crash (general protection fault).
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2019-3701 from the MITRE CVE dictionary dictionary and NIST NVD.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 4.4 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H |
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | High |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | High |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise MRG 2 | kernel-rt | Under investigation |
| Red Hat Enterprise Linux 7 | kernel-alt | Under investigation |
| Red Hat Enterprise Linux 7 | kernel | Under investigation |
| Red Hat Enterprise Linux 7 | kernel-rt | Under investigation |
| Red Hat Enterprise Linux 6 | kernel | Under investigation |
| Red Hat Enterprise Linux 5 | kernel | Under investigation |
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