CVE-2021-47668

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux39549eef3587f1c1e8c65c88a2400d10fd30ea17 < 260925a0b7d2da5449f8ecfd02c1405e0c8a45b8affected
LinuxLinux39549eef3587f1c1e8c65c88a2400d10fd30ea17 < bbc6847b9b8978b520f62fbc7c68c54ef0f8d282affected
LinuxLinux39549eef3587f1c1e8c65c88a2400d10fd30ea17 < 92668d28c7e6a7a2ba07df287669ffcdf650c421affected
LinuxLinux39549eef3587f1c1e8c65c88a2400d10fd30ea17 < 08ab951787098ae0b6c0364aeea7a8138226f234affected
LinuxLinux39549eef3587f1c1e8c65c88a2400d10fd30ea17 < ac48ef15826e83f4206c47add61072e8fc76d328affected
LinuxLinux39549eef3587f1c1e8c65c88a2400d10fd30ea17 < 593c072b7b3c4d7044416eb039d9ad706bedd67aaffected
LinuxLinux39549eef3587f1c1e8c65c88a2400d10fd30ea17 < 03f16c5075b22c8902d2af739969e878b0879c94affected
LinuxLinux2.6.31affected
LinuxLinux0 < 2.6.31unaffected
LinuxLinux4.4.254 <= 4.4.*unaffected
LinuxLinux4.9.254 <= 4.9.*unaffected
LinuxLinux4.14.218 <= 4.14.*unaffected
LinuxLinux4.19.171 <= 4.19.*unaffected
LinuxLinux5.4.93 <= 5.4.*unaffected
LinuxLinux5.10.11 <= 5.10.*unaffected
LinuxLinux5.11 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References