Linux Kernel up to 5.10.82/5.15.5 netif_carrier_on/netif_carrier_off null pointer dereference
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
5.5 | $0-$5k | 0.00 |
A vulnerability classified as critical was found in Linux Kernel up to 5.10.82/5.15.5. Affected by this vulnerability is the function netif_carrier_on/netif_carrier_off
. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:
In the Linux kernel, the following vulnerability has been resolved: mlxsw: spectrum: Protect driver from buggy firmware When processing port up/down events generated by the device's firmware, the driver protects itself from events reported for non-existent local ports, but not the CPU port (local port 0), which exists, but lacks a netdev. This can result in a NULL pointer dereference when calling netif_carrier_{on,off}(). Fix this by bailing early when processing an event reported for the CPU port. Problem was only observed when running on top of a buggy emulator.
The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2021-47560. The exploitation appears to be easy. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/24/2024).
Upgrading to version 5.10.83 or 5.15.6 eliminates this vulnerability. Applying the patch 90d0736876c5/da4d70199e5d/63b08b1f6834 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.
Entries connected to this vulnerability are available at VDB-271653, VDB-271654, VDB-271656 and VDB-271657.
Product
Type
Vendor
Name
Version
- 5.10.0
- 5.10.1
- 5.10.2
- 5.10.3
- 5.10.4
- 5.10.5
- 5.10.6
- 5.10.7
- 5.10.8
- 5.10.9
- 5.10.10
- 5.10.11
- 5.10.12
- 5.10.13
- 5.10.14
- 5.10.15
- 5.10.16
- 5.10.17
- 5.10.18
- 5.10.19
- 5.10.20
- 5.10.21
- 5.10.22
- 5.10.23
- 5.10.24
- 5.10.25
- 5.10.26
- 5.10.27
- 5.10.28
- 5.10.29
- 5.10.30
- 5.10.31
- 5.10.32
- 5.10.33
- 5.10.34
- 5.10.35
- 5.10.36
- 5.10.37
- 5.10.38
- 5.10.39
- 5.10.40
- 5.10.41
- 5.10.42
- 5.10.43
- 5.10.44
- 5.10.45
- 5.10.46
- 5.10.47
- 5.10.48
- 5.10.49
- 5.10.50
- 5.10.51
- 5.10.52
- 5.10.53
- 5.10.54
- 5.10.55
- 5.10.56
- 5.10.57
- 5.10.58
- 5.10.59
- 5.10.60
- 5.10.61
- 5.10.62
- 5.10.63
- 5.10.64
- 5.10.65
- 5.10.66
- 5.10.67
- 5.10.68
- 5.10.69
- 5.10.70
- 5.10.71
- 5.10.72
- 5.10.73
- 5.10.74
- 5.10.75
- 5.10.76
- 5.10.77
- 5.10.78
- 5.10.79
- 5.10.80
- 5.10.81
- 5.10.82
- 5.15.0
- 5.15.1
- 5.15.2
- 5.15.3
- 5.15.4
- 5.15.5
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔒VulDB CVSS-BT Score: 🔒
VulDB Vector: 🔒
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 5.7VulDB Meta Temp Score: 5.5
VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Exploiting
Class: Null pointer dereferenceCWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒
Local: No
Remote: Partially
Availability: 🔒
Status: Not defined
EPSS Score: 🔒
EPSS Percentile: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
0-Day Time: 🔒
Upgrade: Kernel 5.10.83/5.15.6
Patch: 90d0736876c5/da4d70199e5d/63b08b1f6834
Timeline
05/24/2024 Advisory disclosed05/24/2024 VulDB entry created
05/24/2024 VulDB entry last update
Sources
Vendor: kernel.orgAdvisory: git.kernel.org
Status: Confirmed
CVE: CVE-2021-47560 (🔒)
See also: 🔒
Entry
Created: 05/24/2024 18:45Changes: 05/24/2024 18:45 (56)
Complete: 🔍
Cache ID: 3:465:103
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