// For flags

CVE-2021-47295

net: sched: fix memory leak in tcindex_partial_destroy_work

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

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.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: net: sched: corrige la pérdida de memoria en tcindex_partial_destroy_work Syzbot informó una pérdida de memoria en tcindex_set_parms(). El problema estaba en el hash perfecto no liberado en tcindex_partial_destroy_work(). En tcindex_set_parms() se asigna un nuevo tcindex_data y algunos campos del anterior se copian al nuevo, pero no el hash perfecto. Dado que tcindex_partial_destroy_work() es la función de destrucción del antiguo tcindex_data, necesitamos liberar un hash perfecto para evitar pérdidas de memoria.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-05-21 CVE Reserved
  • 2024-05-21 CVE Published
  • 2024-05-22 EPSS Updated
  • 2024-12-19 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-400: Uncontrolled Resource Consumption
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 3.18 < 5.4.136
Search vendor "Linux" for product "Linux Kernel" and version " >= 3.18 < 5.4.136"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 3.18 < 5.10.54
Search vendor "Linux" for product "Linux Kernel" and version " >= 3.18 < 5.10.54"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 3.18 < 5.13.6
Search vendor "Linux" for product "Linux Kernel" and version " >= 3.18 < 5.13.6"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 3.18 < 5.14
Search vendor "Linux" for product "Linux Kernel" and version " >= 3.18 < 5.14"
en
Affected