// For flags

CVE-2021-47232

can: j1939: fix Use-after-Free, hold skb ref while in use

Severity Score

8.4
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

In the Linux kernel, the following vulnerability has been resolved: can: j1939: fix Use-after-Free, hold skb ref while in use This patch fixes a Use-after-Free found by the syzbot. The problem is that a skb is taken from the per-session skb queue,
without incrementing the ref count. This leads to a Use-after-Free if
the skb is taken concurrently from the session queue due to a CTS.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: j1939: corrige Use-after-Free, mantenga presionada la referencia skb mientras está en uso. Este parche corrige un Use-after-Free encontrado por syzbot. El problema es que se toma un skb de la cola de skb por sesión, sin incrementar el recuento de referencias. Esto conduce a un use after free si el skb se toma simultáneamente de la cola de sesión debido a un CTS.

In the Linux kernel, the following vulnerability has been resolved: can: j1939: fix Use-after-Free, hold skb ref while in use This patch fixes a Use-after-Free found by the syzbot. The problem is that a skb is taken from the per-session skb queue, without incrementing the ref count. This leads to a Use-after-Free if the skb is taken concurrently from the session queue due to a CTS.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2024-04-10 CVE Reserved
  • 2024-05-21 CVE Published
  • 2024-12-19 CVE Updated
  • 2025-04-05 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-416: Use After Free
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"
 >= 5.4 < 5.4.128
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.4 < 5.4.128"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.4 < 5.10.46
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.4 < 5.10.46"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.4 < 5.12.13
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.4 < 5.12.13"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.4 < 5.13
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.4 < 5.13"
en
Affected