7.8

CVE-2021-47058: regmap: set debugfs_name to NULL after it is freed

Analyzed
AliasesUBUNTU-CVE-2021-47058DEBIAN-CVE-2021-47058
Published 29-02-2024Last modified 23-05-2026

Vulnerability summary

CVE-2021-47058 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.9% 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
0.25%
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-2024:1454-1SUSE-SU-2024:1465-1SUSE-SU-2024:1489-1

Timeline

  1. 29-02-2024
    PublishedVulnerability first disclosed.
  2. 23-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: regmap: set debugfs_name to NULL after it is freed There is a upstream commit cffa4b2122f5("regmap:debugfs: Fix a memory leak when calling regmap_attach_dev") that adds a if condition when create name for debugfs_name. With below function invoking logical, debugfs_name is freed in regmap_debugfs_exit(), but it is not created again because of the if condition introduced by above commit. regmap_reinit_cache() regmap_debugfs_exit() ... regmap_debugfs_init() So, set debugfs_name to NULL after it is freed.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.25% 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.

Ubuntu79 products
  • linux< 5.4.0-77.86
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.4.0-1051.53
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 5b654b03007917f3f1015b2a5c288c1ea6ae8f65, < 2dc1554d5f0fdaf47cc5bea442b84b9226fea867 | ≥ 480c5e9c7e4c76c01d5f1f7b73832d7b77e6b427, < d8897f7b2283a500666c85ef06e820df38ed7b52 | ≥ c9698380b01aed3281160d3ab25749b57d6913b8, < eb949f891226c012138ffd9df90d1e509f428ae6 | ≥ cffa4b2122f5f3e53cf3d529bbc74651f95856d5, < c764e375ae647832de1ee73d43a4bb3ef8a8f43d | ≥ cffa4b2122f5f3e53cf3d529bbc74651f95856d5, < b9e569ae1da3a113b3acee8703c94777fd20938a | ≥ cffa4b2122f5f3e53cf3d529bbc74651f95856d5, < e41a962f82e7afb5b1ee644f48ad0b3aee656268 | ≥ 4.19.168, < 4.19.191 | ≥ 5.4.90, < 5.4.119 | ≥ 5.10.8, < 5.10.37 | 5.11
  • linux_kernel≥ 4.19.168, < 4.19.191 | ≥ 5.4.90, < 5.4.119 | ≥ 5.10.8, < 5.10.37 | ≥ 5.11, < 5.11.21 | ≥ 5.12, < 5.12.4
Debian1 product
  • linux< 5.10.38-1

3 vendors · 82 products

References

10 links