5.5

CVE-2021-47332: ALSA: usx2y: Don't call free_pages_exact() with NULL address

Analyzed
AliasesUBUNTU-CVE-2021-47332DEBIAN-CVE-2021-47332
Published 21-05-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47332 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · 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 3 · Related 3
SUSE-SU-2024:2010-1SUSE-SU-2024:2183-1SUSE-SU-2024:2185-1

Timeline

  1. 21-05-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usx2y: Don't call free_pages_exact() with NULL address Unlike some other functions, we can't pass NULL pointer to free_pages_exact(). Add a proper NULL check for avoiding possible Oops.

CVSS metrics

4 scores · 3 sources · 2 versions

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

Ubuntu83 products
  • linux< 5.4.0-88.99
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.4.0-1057.60
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 36b8defc447627c3e91058c43941ec15d827556e, < 88262229b778f4f7a896da828d966f94dcb35d19 | ≥ 36b8defc447627c3e91058c43941ec15d827556e, < 7d7f30cf182e55023fa8fde4c084b2d37c6be69d | ≥ 36b8defc447627c3e91058c43941ec15d827556e, < bee295f5e03510252d18b25cc1d26230256eb87a | ≥ 36b8defc447627c3e91058c43941ec15d827556e, < 82e5ee742fdd8874fe996181b87fafe1eb5f1196 | ≥ 36b8defc447627c3e91058c43941ec15d827556e, < cae0cf651adccee2c3f376e78f30fbd788d0829f | 5.2
  • linux_kernel< 5.4.134 | ≥ 5.5, < 5.10.52 | ≥ 5.11, < 5.12.19 | ≥ 5.13, < 5.13.4
Debian1 product
  • linux< 5.14.6-1

3 vendors · 86 products

References

9 links