CVE-2021-47668

Advisory lineage Upstream: 0 Downstream: 5
Analyzed
Published: 17 Apr 2025, 18:01
Last modified:11 May 2026, 13:58

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.04% LOW
0% probability +0.01%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

17 Apr 2025, 18:01
Published
Vulnerability first disclosed
11 May 2026, 13:58
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.04%• Percentile: 12%

Techniques & Countermeasures

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

  • linux•linux

    ≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < 260925a0b7d2da5449f8ecfd02c1405e0c8a45b8 | ≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < bbc6847b9b8978b520f62fbc7c68c54ef0f8d282 | ≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < 92668d28c7e6a7a2ba07df287669ffcdf650c421 | ≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < 08ab951787098ae0b6c0364aeea7a8138226f234 | ≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < ac48ef15826e83f4206c47add61072e8fc76d328 | ≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < 593c072b7b3c4d7044416eb039d9ad706bedd67a | ≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < 03f16c5075b22c8902d2af739969e878b0879c94 | 2.6.31

  • linux•linux_kernel

    ≥ 2.6.31, < 4.4.254 | ≥ 4.5, < 4.9.254 | ≥ 4.10, < 4.14.218 | ≥ 4.15, < 4.19.171 | ≥ 4.20, < 5.4.93 | ≥ 5.5, < 5.10.11 | 5.11:rc1 | 5.11:rc2 | 5.11:rc3 | 5.11:rc4

References (7)