Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
Low
Attack Vector
Local
1

CVE-2021-46959

Disclosure Date: February 29, 2024 •
CVE-2021-46959 CVSS v3 Base Score: 7.8
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

In the Linux kernel, the following vulnerability has been resolved:

spi: Fix use-after-free with devm_spialloc*

We can’t rely on the contents of the devres list during
spi_unregister_controller(), as the list is already torn down at the
time we perform devres_find() for devm_spi_release_controller. This
causes devices registered with devm_spialloc{master,slave}() to be
mistakenly identified as legacy, non-devm managed devices and have their
reference counters decremented below 0.

——————[ cut here ]——————
WARNING: CPU: 1 PID: 660 at lib/refcount.c:28 refcount_warn_saturate+0x108/0x174
<b0396f04> from <b03c56a4>
<b03c5614> from <b0447b4c>
r4:b6700140
<b0447b2c> from <b07515e8>
<b07515ac> from <b045343c>
r5:b6700180 r4:b6700100
<b04533b8> from <b0454160>
r8:b1638c54 r7:b117ad94 r6:b1638c10 r5:b117ad94 r4:b163dc10
<b0454104> from <b044e41c>
r5:b117ad94 r4:b163dc10
<b044e2d8> from <b044f70c>
r9:00000000 r8:00000000 r7:b117ad94 r6:b163dc54 r5:b1638c10 r4:b163dc10
<b044f688> from <b044d274>

Instead, determine the devm allocation state as a flag on the
controller which is guaranteed to be stable during cleanup.

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CVSS V3 Severity and Metrics
Base Score:
7.8 High
Impact Score:
5.9
Exploitability Score:
1.8
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Local
Attack Complexity (AC):
Low
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Linux 62bb2c7f2411
Linux 8bf96425c90f
Linux 8e029707f50a
Linux 28a5529068c5
Linux 001c8e83646a
Linux c7fabe372a90
Linux not down converted
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • linux

Products

  • linux kernel
Technical Analysis