CVE-2021-47668

HIGHNVD 7.87.8—

7.8

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 v3: 7.8
EG Score: 7.8(medium)
EPSS: 5.4%
KEV: Not listed

Published

April 17, 2025

Last Modified

April 21, 2025

References (7)

416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/03f16c5075b22c8902d2af739969e878b0879c94
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/08ab951787098ae0b6c0364aeea7a8138226f234
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/260925a0b7d2da5449f8ecfd02c1405e0c8a45b8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/593c072b7b3c4d7044416eb039d9ad706bedd67a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/92668d28c7e6a7a2ba07df287669ffcdf650c421
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ac48ef15826e83f4206c47add61072e8fc76d328
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bbc6847b9b8978b520f62fbc7c68c54ef0f8d282

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-416Use After Free

Data Freshness Timeline

(refreshed 13× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-23 21:31 UTCEPSS rescore
2026-06-23 21:31 UTCEPSS rescore
2026-06-22 14:24 UTCEPSS rescore
2026-06-21 14:55 UTCEPSS rescore
2026-06-21 01:58 UTCEPSS rescore
2026-06-21 01:58 UTCEPSS rescore
2026-06-19 19:24 UTCEPSS rescore
2026-06-19 19:24 UTCEPSS rescore
2026-06-18 17:51 UTCEPSS rescore
2026-06-18 17:51 UTCEPSS rescore
2026-06-18 15:14 UTCOSV refresh
2026-06-17 17:51 UTCEPSS rescore
2026-06-17 17:51 UTCEPSS rescore
2026-06-16 17:51 UTCEPSS rescore
2026-06-15 17:46 UTCEPSS rescore
2026-06-14 23:15 UTCEPSS rescore
2026-06-14 23:15 UTCEPSS rescore
2026-06-13 22:58 UTCEPSS rescore
2026-06-13 22:58 UTCEPSS rescore
2026-06-12 23:10 UTCEPSS rescore
2026-06-11 13:58 UTCEPSS rescore
2026-06-10 22:16 UTCEPSS rescore
2026-06-10 13:20 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore

Show 22 more

2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:11 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-30 07:10 UTCEG score recompute
2026-05-30 07:10 UTCGHSA enrichment
2026-05-29 21:20 UTCOSV refresh
2026-05-29 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-47668?

CVE-2021-47668 is a high vulnerability published on April 17, 2025. In the Linux kernel, the following vulnerability has been resolved: can: dev: can_restart: fix use after free bug After calling netifrxni(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is accessed after the netifrxni() in: stats->rx_bytes += cf->len;…

When was CVE-2021-47668 disclosed?

CVE-2021-47668 was first published in the National Vulnerability Database on April 17, 2025, with the most recent update on April 21, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-47668 actively exploited?

CVE-2021-47668 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-47668?

CVE-2021-47668 has a CVSS v3 base score of 7.8 (NVD).

How do I remediate CVE-2021-47668?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47668, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2021-47668

Explore →

Is Your Infrastructure Affected by CVE-2021-47668?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2021-47668

📅 Published

🔄 Last Modified

🔗 References (7)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-47668?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (7)

Frequently asked(5)

Related CVEs(same CWE)