CVE-2022-48977: can: af_can: fix NULL pointer dereference in can_rcv_filter

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-10-21 · updated 2026-06-17
Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: can: af_can: fix NULL pointer dereference in can_rcv_filter Analogue to commit 8aa59e355949 ("can: af_can: fix NULL pointer dereference in can_rx_register()") we need to check for a missing initialization of ml_priv in the receive path of CAN frames. Since commit 4e096a18867a ("net: introduce CAN specific pointer in the struct net_device") the check for dev->type to be ARPHRD_CAN is not sufficient anymore since bonding or tun netdevices claim to be CAN devices but do not initialize ml_priv accordingly.

Affected products

Linux kernel: from 5.4.110 before 5.4.227; from 5.10.28 before 5.10.159; from 5.11.12 before 5.15.83; from 5.16 before 6.0.13; 6.1-rc1, 6.1-rc2, 6.1-rc3, 6.1-rc4, 6.1-rc5, 6.1-rc6 (+2) — fixed in 5.10.159, 5.15.83, 5.4.227, 6.0.13

How to fix

Upgrade to a fixed version: Linux kernel 5.10.159, 5.15.83, 5.4.227, 6.0.13. Check the vendor advisory for mitigations.

References

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