7.8

CVE-2021-47483: linux Double Free

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2021-47483DEBIAN-CVE-2021-47483
Published 22-05-2024Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2021-47483 is a high (CVSS 7.8) Double Free vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 12.8% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.23%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 15 · Related 14
RHSA-2022:7683SUSE-SU-2024:1979-1SUSE-SU-2024:1983-1SUSE-SU-2024:2008-1SUSE-SU-2024:2010-1SUSE-SU-2024:2011-1

Timeline

  1. 22-05-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: regmap: Fix possible double-free in regcache_rbtree_exit() In regcache_rbtree_insert_to_block(), when 'present' realloc failed, the 'blk' which is supposed to assign to 'rbnode->block' will be freed, so 'rbnode->block' points a freed memory, in the error handling path of regcache_rbtree_init(), 'rbnode->block' will be freed again in regcache_rbtree_exit(), KASAN will report double-free as follows: BUG: KASAN: double-free or invalid-free in kfree+0xce/0x390 Call Trace: slab_free_freelist_hook+0x10d/0x240 kfree+0xce/0x390 regcache_rbtree_exit+0x15d/0x1a0 regcache_rbtree_init+0x224/0x2c0 regcache_init+0x88d/0x1310 __regmap_init+0x3151/0x4a80 __devm_regmap_init+0x7d/0x100 madera_spi_probe+0x10f/0x333 [madera_spi] spi_probe+0x183/0x210 really_probe+0x285/0xc30 To fix this, moving up the assignment of rbnode->block to immediately after the reallocation has succeeded so that the data structure stays valid even if the second reallocation fails.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

0.00 pp

From 0.23% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.23%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu87 products
  • linux< 3.13.0-205.256 | < 4.4.0-267.301 | < 4.15.0-167.175 | < 5.4.0-92.103
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1142.148 | < 4.4.0-1180.195 | < 4.15.0-1119.127 | < 5.4.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 3f4ff561bc88b074d5e868dde4012d89cbb06c87, < e72dce9afbdbfa70d9b44f5908a50ff6c4858999 | ≥ 3f4ff561bc88b074d5e868dde4012d89cbb06c87, < fc081477b47dfc3a6cb50a96087fc29674013fc2 | ≥ 3f4ff561bc88b074d5e868dde4012d89cbb06c87, < 758ced2c3878ff789801e6fee808e185c5cf08d6 | ≥ 3f4ff561bc88b074d5e868dde4012d89cbb06c87, < 3dae1a4eced3ee733d7222e69b8a55caf2d61091 | ≥ 3f4ff561bc88b074d5e868dde4012d89cbb06c87, < 1cead23c1c0bc766dacb900a3b0269f651ad596f | ≥ 3f4ff561bc88b074d5e868dde4012d89cbb06c87, < 36e911a16b377bde0ad91a8c679069d0d310b1a6 | ≥ 3f4ff561bc88b074d5e868dde4012d89cbb06c87, < 50cc1462a668dc62949a1127388bc3af785ce047 | ≥ 3f4ff561bc88b074d5e868dde4012d89cbb06c87, < 55e6d8037805b3400096d621091dfbf713f97e83 | 3.12
  • linux_kernel≥ 3.12, < 4.4.291 | ≥ 4.5, < 4.9.289 | ≥ 4.10, < 4.14.254 | ≥ 4.15, < 4.19.215 | ≥ 4.20, < 5.4.157 | ≥ 5.5, < 5.10.77 | ≥ 5.11, < 5.14.16 | 5.15:rc1 | 5.15:rc2 | 5.15:rc3 | 5.15:rc4 | 5.15:rc5 | 5.15:rc6 | 5.15:rc7
Debian1 product
  • linux< 5.15.3-1

3 vendors · 90 products

References

15 links
Show all 15 references