Linux Kernel 2.6.x lib/idr.c idr_remove_all double free

CVSS Meta Temp Score
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CTI Interest Score
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7.5$5k-$25k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel 2.6.x. This affects the function idr_remove_all in the library lib/idr.c. The manipulation leads to double free. This vulnerability is referenced as CVE-2019-3896. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in Linux Kernel 2.6.x (Operating System). It has been rated as critical. This issue affects the function idr_remove_all in the library lib/idr.c. The manipulation with an unknown input leads to a double free vulnerability. Using CWE to declare the problem leads to CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A double-free can happen in idr_remove_all() in lib/idr.c in the Linux kernel 2.6 branch. An unprivileged local attacker can use this flaw for a privilege escalation or for a system crash and a denial of service (DoS).

The weakness was published 06/19/2019 with Netflix as confirmed bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. The identification of this vulnerability is CVE-2019-3896 since 01/03/2019. Attacking locally is a requirement. The successful exploitation needs a simple authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/06/2023).

The commercial vulnerability scanner Qualys is able to test this issue with plugin 237295 (Red Hat Update for kernel (Sad SACK) (RHSA-2019:1488)).

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

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 108818†). Similar entries are available at VDB-136601, VDB-136651 and VDB-136652. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.8
VulDB Temp Score: 7.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CNA Base Score: 7.0
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Double free
CWE: CWE-415 / 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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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/03/2019 🔍
06/17/2019 +165 days 🔍
06/19/2019 +2 days 🔍
06/19/2019 +0 days 🔍
10/06/2023 +1570 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2019:1488
Organization: Netflix
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-3896 (🔍)
GCVE (CVE): GCVE-0-2019-3896
GCVE (VulDB): GCVE-100-136655
SecurityFocus: 108818 - Linux Kernel CVE-2019-11479 Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 06/19/2019 17:34
Updated: 10/06/2023 13:26
Changes: 06/19/2019 17:34 (64), 06/25/2020 16:28 (4), 10/06/2023 13:20 (3), 10/06/2023 13:26 (13)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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