Bug 2357249 (CVE-2025-31115)

Summary:	CVE-2025-31115 xz: XZ has a heap-use-after-free bug in threaded .xz decoder
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in the XZ Utils library. In affected versions, the multithreaded .xz decoder in liblzma has a bug where invalid input can trigger a heap use-after-free condition, allowing writes to an address based on the null pointer plus an offset. This issue may result in a crash or other undefined behavior. Applications and libraries that use the `lzma_stream_decoder_mt` function are affected.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2357252, 2357251, 2357253
Bug Blocks:

Description OSIDB Bzimport 2025-04-03 18:01:27 UTC

XZ Utils provide a general-purpose data-compression library plus command-line tools. In XZ Utils 5.3.3alpha to 5.8.0, the multithreaded .xz decoder in liblzma has a bug where invalid input can at least result in a crash. The effects include heap use after free and writing to an address based on the null pointer plus an offset. Applications and libraries that use the lzma_stream_decoder_mt function are affected. The bug has been fixed in XZ Utils 5.8.1, and the fix has been committed to the v5.4, v5.6, v5.8, and master branches in the xz Git repository. No new release packages will be made from the old stable branches, but a standalone patch is available that applies to all affected releases.

Comment 2 errata-xmlrpc 2025-05-13 19:10:15 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:7524 https://access.redhat.com/errata/RHSA-2025:7524