5.5

CVE-2021-47353: linux NULL Pointer Dereference

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2021-47353DEBIAN-CVE-2021-47353
Published 21-05-2024Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2021-47353 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 22.3% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.31%
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 10 · Related 8
RHSA-2024:4211RHSA-2024:4352SUSE-SU-2024:1979-1SUSE-SU-2024:1983-1SUSE-SU-2024:2010-1SUSE-SU-2024:2184-1

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: udf: Fix NULL pointer dereference in udf_symlink function In function udf_symlink, epos.bh is assigned with the value returned by udf_tgetblk. The function udf_tgetblk is defined in udf/misc.c and returns the value of sb_getblk function that could be NULL. Then, epos.bh is used without any check, causing a possible NULL pointer dereference when sb_getblk fails. This fix adds a check to validate the value of epos.bh.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

0.00 pp

From 0.31% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.31%

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
  • linuxAll versions (No fix recorded) | < 4.4.0-269.303 | < 4.15.0-156.163 | < 5.4.0-84.94
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1144.150 | < 4.4.0-1182.197 | < 4.15.0-1111.118 | < 5.4.0-1056.59
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2f3d9ddd32a28803baa547e6274983b67d5e287c | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 371566f63cbd0bb6fbb25b8fe9d5798268d35af9 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < baea588a42d675e35daeaddd10fbc9700550bc4d | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 3638705ecd5ad2785e996f820121c0ad15ce64b5 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 80d505aee6398cf8beb72475c7edcf1733c1c68b | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 21bf1414580c36ffc8d8de043beb3508cf812238 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < aebed6b19e51a34003d998da5ebb1dfdd2cb1d02 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 5150877e4d99f85057a458daac7cd7c01005d5c6 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43 | 2.6.12
  • linux_kernel< 4.4.276 | ≥ 4.5, < 4.9.276 | ≥ 4.10, < 4.14.240 | ≥ 4.15, < 4.19.198 | ≥ 4.20, < 5.4.133 | ≥ 5.5, < 5.10.51 | ≥ 5.11, < 5.12.18 | ≥ 5.13, < 5.13.3
Debian1 product
  • linux< 5.14.6-1

3 vendors · 90 products

References

16 links
Show all 16 references