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Use After Free The advisory has been revoked - it doesn't affect any version of package kernel-rt-devel  (opens in a new tab)

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  • Snyk IDSNYK-SLES152-KERNELRTDEVEL-2690510
  • published14 Apr 2022
  • disclosed10 Feb 2021
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Introduced: 10 Feb 2021

CVE-2020-29569  (opens in a new tab)
CWE-416  (opens in a new tab)

Amendment

The SLES security team deemed this advisory irrelevant for SLES:15.2.

NVD Description

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

An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.

References