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Out-of-bounds Write The advisory has been revoked - it doesn't affect any version of package kernel-rt-devel  (opens in a new tab)

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EPSS
0.07% (34th percentile)

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  • Snyk IDSNYK-SLES151-KERNELRTDEVEL-2712957
  • published14 Apr 2022
  • disclosed28 Apr 2020
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Introduced: 28 Apr 2020

CVE-2019-3701  (opens in a new tab)
CWE-787  (opens in a new tab)

Amendment

The SLES security team deemed this advisory irrelevant for SLES:15.1.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-devel package and not the kernel-rt-devel package as distributed by SLES.

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. The privileged user "root" with CAP_NET_ADMIN can create a CAN frame modification rule that makes the data length code a higher value than the available CAN frame data size. In combination with a configured checksum calculation where the result is stored relatively to the end of the data (e.g. cgw_csum_xor_rel) the tail of the skb (e.g. frag_list pointer in skb_shared_info) can be rewritten which finally can cause a system crash. 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.

References