7.8

CVE-2021-47669: can: vxcan: vxcan_xmit: fix use after free bug

Analyzed
AliasesUBUNTU-CVE-2021-47669DEBIAN-CVE-2021-47669
Published 17-04-2025Last modified 05-08-2026

Vulnerability summary

CVE-2021-47669 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.19%
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: vxcan: vxcan_xmit: fix use after free bug After calling netif_rx_ni(skb), dereferencing skb is unsafe. Especially, the canfd_frame cfd which aliases skb memory is accessed after the netif_rx_ni().

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.19% 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: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu95 products
  • linux< 4.15.0-141.145 | < 5.4.0-67.75
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 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≥ a8f820a380a2a06fc4fe1a54159067958f800929, < 6d6dcf2399cdd26f7f5426ca8dd8366b7f2ca105 | ≥ a8f820a380a2a06fc4fe1a54159067958f800929, < 9b820875a32a3443d67bfd368e93038354e98052 | ≥ a8f820a380a2a06fc4fe1a54159067958f800929, < a24476b37167816e6352ca1a2cf3769847774f70 | ≥ a8f820a380a2a06fc4fe1a54159067958f800929, < e771a874076115df8bff27d325edfd2340e4ec69 | ≥ a8f820a380a2a06fc4fe1a54159067958f800929, < 75854cad5d80976f6ea0f0431f8cedd3bcc475cb | 4.12
  • linux_kernel≥ 4.12, < 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 · 98 products

References

9 links