Linux Kernel prior 4.9.190/4.14.139 net/ipv4/tcp_output.c use after free

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6.3$0-$5k0.00

A vulnerability, which was classified as critical, was found in Linux Kernel (Operating System). This affects an unknown code of the file net/ipv4/tcp_output.c. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-416. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, a certain net/ipv4/tcp_output.c change, which was properly incorporated into 4.16.12, was incorrectly backported to the earlier longterm kernels, introducing a new vulnerability that was potentially more severe than the issue that was intended to be fixed by backporting. Specifically, by adding to a write queue between disconnection and re-connection, a local attacker can trigger multiple use-after-free conditions. This can result in a kernel crash, or potentially in privilege escalation. NOTE: this affects (for example) Linux distributions that use 4.9.x longterm kernels before 4.9.190 or 4.14.x longterm kernels before 4.14.139.

The weakness was presented 08/20/2019 (Website). It is possible to read the advisory at access.redhat.com. This vulnerability is uniquely identified as CVE-2019-15239 since 08/20/2019. Attacking locally is a requirement. A authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 4.9.190 or 4.14.139 eliminates this vulnerability.

See 140405 and 140404 for similar entries.

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VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

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VulDB Base Score: 🔍
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Exploitinginfoedit

Class: Memory corruption (CWE-416)
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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Current Price Estimation: 🔍

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Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.9.190/4.14.139

Timelineinfoedit

08/20/2019 🔍
08/20/2019 +0 days 🔍
08/21/2019 +1 days 🔍
08/01/2020 +346 days 🔍

Sourcesinfoedit

Vendor: https://www.kernel.org/

Advisory: access.redhat.com
Status: Not defined

CVE: CVE-2019-15239 (🔍)
See also: 🔍

Entryinfoedit

Created: 08/21/2019 07:18 AM
Updated: 08/01/2020 12:50 PM
Changes: (1) advisory_url
Complete: 🔍

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