8.8

CVE-2021-47668: can: dev: can_restart: fix use after free bug

Modified
AliasesUBUNTU-CVE-2021-47668DEBIAN-CVE-2021-47668
Published 17-04-2025Last modified 05-08-2026

Vulnerability summary

CVE-2021-47668 is a high (CVSS 8.8) Use After Free vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.8, adjacent network); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
SUSE-SU-2025:01600-1SUSE-SU-2025:01633-1SUSE-SU-2025:1574-1

Timeline

  1. 17-04-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability 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

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: adjacent network, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu96 products
  • linuxAll versions (No fix recorded) | < 4.4.0-204.236 | < 4.15.0-141.145 | < 5.4.0-67.75
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1087.91 | < 4.4.0-1123.137 | < 4.15.0-1098.105 | < 5.4.0-1039.41
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < 260925a0b7d2da5449f8ecfd02c1405e0c8a45b8 | ≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < bbc6847b9b8978b520f62fbc7c68c54ef0f8d282 | ≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < 92668d28c7e6a7a2ba07df287669ffcdf650c421 | ≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < 08ab951787098ae0b6c0364aeea7a8138226f234 | ≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < ac48ef15826e83f4206c47add61072e8fc76d328 | ≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < 593c072b7b3c4d7044416eb039d9ad706bedd67a | ≥ 39549eef3587f1c1e8c65c88a2400d10fd30ea17, < 03f16c5075b22c8902d2af739969e878b0879c94 | 2.6.31
  • 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
Debian1 product
  • linux< 5.10.12-1

3 vendors · 99 products

References

11 links
Show all 11 references