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Use After Free The advisory has been revoked - it doesn't affect any version of package kernel-headers  (opens in a new tab)

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  • Snyk IDSNYK-RHEL7-KERNELHEADERS-4913574
  • published26 Jul 2021
  • disclosed20 Aug 2019
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Introduced: 20 Aug 2019

CVE-2019-15239  (opens in a new tab)
CWE-416  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:7.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-headers package and not the kernel-headers package as distributed by RHEL.

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.

References