CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
7.6 | $5k-$25k | 0.00 |
A vulnerability was found in Linux Kernel up to 5.10.82/5.15.5. It has been rated as critical. This issue affects the function emergency_ctx
. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability. The summary by CVE is:
In the Linux kernel, the following vulnerability has been resolved: powerpc/32: Fix hardlockup on vmap stack overflow Since the commit c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not activate MMU before reading task struct") a vmap stack overflow results in a hard lockup. This is because emergency_ctx is still addressed with its virtual address allthough data MMU is not active anymore at that time. Fix it by using a physical address instead.
It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2021-47567. The exploitation is known to be easy. Technical details of the vulnerability are known, but there is no available exploit. The pricing 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 dfe906da9a1a/c4e3ff8b8b1d/5bb60ea611db 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.
The entries VDB-271653, VDB-271654, VDB-271656 and VDB-271657 are related to this item.
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: 8.0VulDB Meta Temp Score: 7.6
VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍
CVSSv2
AV | AC | Au | C | I | A |
---|---|---|---|---|---|
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
---|---|---|---|---|---|
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: Stack-based overflowCWE: CWE-121 / CWE-119
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 |
---|---|---|---|---|
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: dfe906da9a1a/c4e3ff8b8b1d/5bb60ea611db
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-2021-47567 (🔒)
See also: 🔒
Entry
Created: 05/24/2024 18:43Changes: 05/24/2024 18:43 (56)
Complete: 🔍
Cache ID: 52:480:103
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