Linux Kernel up to 5.5.6 on AArch64 GNU C Library memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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5.4$5k-$25k0.00

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 5.5.6 on AArch64. Affected by this vulnerability is an unknown functionality of the component GNU C Library. Performing a manipulation results in memory corruption. This vulnerability was named CVE-2020-9391. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.5.6 on AArch64 (Operating System). It has been classified as critical. This affects some unknown processing of the component GNU C Library. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in the Linux kernel 5.4 and 5.5 through 5.5.6 on the AArch64 architecture. It ignores the top byte in the address passed to the brk system call, potentially moving the memory break downwards when the application expects it to move upwards, aka CID-dcde237319e6. This has been observed to cause heap corruption with the GNU C Library malloc implementation.

The weakness was presented 02/25/2020. This vulnerability is uniquely identified as CVE-2020-9391 since 02/25/2020. An attack has to be approached locally. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 02/26/2020).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

See VDB-150512 for similar entry. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

02/25/2020 🔍
02/25/2020 +0 days 🔍
02/26/2020 +1 days 🔍
04/02/2024 +1497 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2020-3cd64d683c
Status: Not defined

CVE: CVE-2020-9391 (🔍)
GCVE (CVE): GCVE-0-2020-9391
GCVE (VulDB): GCVE-100-150513
See also: 🔍

Entryinfo

Created: 02/26/2020 07:56
Updated: 04/02/2024 23:56
Changes: 02/26/2020 07:56 (38), 02/26/2020 08:01 (18), 04/02/2024 23:56 (19)
Complete: 🔍
Cache ID: 216:3BC:103

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