CVE-2021-47668

HIGH EPSS 5.4%
Published Apr 17, 20251y ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published Apr 17, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

Description

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 Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
5.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 10

VendorProductVersionRange
linuxlinux_kernel*≥2.6.31  –  <4.4.254
linuxlinux_kernel*≥4.5  –  <4.9.254
linuxlinux_kernel*≥4.10  –  <4.14.218
linuxlinux_kernel*≥4.15  –  <4.19.171
linuxlinux_kernel*≥4.20  –  <5.4.93
linuxlinux_kernel*≥5.5  –  <5.10.11
linuxlinux_kernel5.11any
linuxlinux_kernel5.11any
linuxlinux_kernel5.11any
linuxlinux_kernel5.11any

References 7

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

Remediation

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