CVE-2021-47668

can: dev: can_restart: fix use after free bug

CVSS 7.8 HIGHEPSS 0.2%CWE-416

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.8EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

17 Apr 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

In the Linux kernel, the following vulnerability has been resolved: can: dev: can_restart: fix use after free bug After calling netif_rx_ni(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is accessed after the netif_rx_ni() in: stats->rx_bytes += cf->len; Reordering the lines solves the issue.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Linux · Linux

References

https://git.kernel.org/stable/c/03f16c5075b22c8902d2af739969e878b0879c94 https://git.kernel.org/stable/c/08ab951787098ae0b6c0364aeea7a8138226f234 https://git.kernel.org/stable/c/260925a0b7d2da5449f8ecfd02c1405e0c8a45b8 https://git.kernel.org/stable/c/593c072b7b3c4d7044416eb039d9ad706bedd67a https://git.kernel.org/stable/c/92668d28c7e6a7a2ba07df287669ffcdf650c421 https://git.kernel.org/stable/c/ac48ef15826e83f4206c47add61072e8fc76d328 https://git.kernel.org/stable/c/bbc6847b9b8978b520f62fbc7c68c54ef0f8d282