7.8

CVE-2021-47521: can: sja1000: fix use after free in ems_pcmcia_add_card()

Modified
AliasesUBUNTU-CVE-2021-47521DEBIAN-CVE-2021-47521
Published 24-05-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47521 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15.5% 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 (NVD)
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 8 · Related 8
SUSE-SU-2024:2008-1SUSE-SU-2024:2010-1SUSE-SU-2024:2011-1SUSE-SU-2024:2019-1SUSE-SU-2024:2185-1SUSE-SU-2024:2189-1

Timeline

  1. 24-05-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: can: sja1000: fix use after free in ems_pcmcia_add_card() If the last channel is not available then "dev" is freed. Fortunately, we can just use "pdev->irq" instead. Also we should check if at least one channel was set up.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

16%

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

Ubuntu88 products
  • linuxAll versions (No fix recorded) | < 4.4.0-258.292 | < 4.15.0-169.177 | < 5.4.0-100.113
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1135.141 | < 4.4.0-1173.188 | < 4.15.0-1121.129 | < 5.4.0-1066.69
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ fd734c6f25aea4b2b44b045e489aec67b388577e, < cbd86110546f7f730a1f5d7de56c944a336c15c4 | ≥ fd734c6f25aea4b2b44b045e489aec67b388577e, < 1dd5b819f7e406dc15bbc7670596ff25261aaa2a | ≥ fd734c6f25aea4b2b44b045e489aec67b388577e, < c8718026ba287168ff9ad0ccc4f9a413062cba36 | ≥ fd734c6f25aea4b2b44b045e489aec67b388577e, < ccf070183e4655824936c0f96c4a2bcca93419aa | ≥ fd734c6f25aea4b2b44b045e489aec67b388577e, < 1a295fea90e1acbe80c6d4940f5ff856edcd6bec | ≥ fd734c6f25aea4b2b44b045e489aec67b388577e, < 923f4dc5df679f678e121c20bf2fd70f7bf3e288 | ≥ fd734c6f25aea4b2b44b045e489aec67b388577e, < 474f9a8534f5f89841240a7e978bafd6e1e039ce | ≥ fd734c6f25aea4b2b44b045e489aec67b388577e, < 3ec6ca6b1a8e64389f0212b5a1b0f6fed1909e45 | 3.2
  • linux_kernel≥ 3.2, < 4.4.295 | ≥ 4.5, < 4.9.293 | ≥ 4.10, < 4.14.258 | ≥ 4.15, < 4.19.221 | ≥ 4.20, < 5.4.165 | ≥ 5.5, < 5.10.85 | ≥ 5.11, < 5.15.8
Debian1 product
  • linux< 5.15.15-1

3 vendors · 91 products

References

13 links
Show all 13 references