CVE-2021-47295
Linux Kernel - NetSched Perfect Hash Memory Leak Vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: net: sched: fix memory leak in tcindex_partial_destroy_work Syzbot reported memory leak in tcindex_set_parms(). The problem was in non-freed perfect hash in tcindex_partial_destroy_work(). In tcindex_set_parms() new tcindex_data is allocated and some fields from old one are copied to new one, but not the perfect hash. Since tcindex_partial_destroy_work() is the destroy function for old tcindex_data, we need to free perfect hash to avoid memory leak.
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
April 2, 2025, 2:47 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47295.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47295 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47295 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 02, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.54 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.13.6 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.18 up to (excluding) 5.4.136 Added Reference Type CVE: https://git.kernel.org/stable/c/8d7924ce85bae64e7a67c366c7c50840f49f3a62 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8d7924ce85bae64e7a67c366c7c50840f49f3a62 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/8e9662fde6d63c78eb1350f6167f64c9d71a865b Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8e9662fde6d63c78eb1350f6167f64c9d71a865b Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/cac71d27745f92ee13f0ecc668ffe151a4a9c9b1 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/cac71d27745f92ee13f0ecc668ffe151a4a9c9b1 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/f5051bcece50140abd1a11a2d36dc3ec5484fc32 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/f5051bcece50140abd1a11a2d36dc3ec5484fc32 Types: Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/8d7924ce85bae64e7a67c366c7c50840f49f3a62 Added Reference https://git.kernel.org/stable/c/8e9662fde6d63c78eb1350f6167f64c9d71a865b Added Reference https://git.kernel.org/stable/c/cac71d27745f92ee13f0ecc668ffe151a4a9c9b1 Added Reference https://git.kernel.org/stable/c/f5051bcece50140abd1a11a2d36dc3ec5484fc32 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 03, 2024
Action Type Old Value New Value Added CWE CISA-ADP CWE-400 Added CVSS V3.1 CISA-ADP AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: net: sched: fix memory leak in tcindex_partial_destroy_work Syzbot reported memory leak in tcindex_set_parms(). The problem was in non-freed perfect hash in tcindex_partial_destroy_work(). In tcindex_set_parms() new tcindex_data is allocated and some fields from old one are copied to new one, but not the perfect hash. Since tcindex_partial_destroy_work() is the destroy function for old tcindex_data, we need to free perfect hash to avoid memory leak. Added Reference kernel.org https://git.kernel.org/stable/c/8d7924ce85bae64e7a67c366c7c50840f49f3a62 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/8e9662fde6d63c78eb1350f6167f64c9d71a865b [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/cac71d27745f92ee13f0ecc668ffe151a4a9c9b1 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/f5051bcece50140abd1a11a2d36dc3ec5484fc32 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47295 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47295
weaknesses.