linux-cve-announce - CVE-2025-39924: erofs: fix invalid algorithm for encoded extents

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Message-ID: <2025100124-CVE-2025-39924-1a11@gregkh>
Date: Wed,  1 Oct 2025 10:07:24 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39924: erofs: fix invalid algorithm for encoded extents

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

erofs: fix invalid algorithm for encoded extents

The current algorithm sanity checks do not properly apply to new
encoded extents.

Unify the algorithm check with Z_EROFS_COMPRESSION(_RUNTIME)_MAX
and ensure consistency with sbi->available_compr_algs.

The Linux kernel CVE team has assigned CVE-2025-39924 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.15 with commit 1d191b4ca51d73699cb127386b95ac152af2b930 and fixed in 6.16.8 with commit db5d7abd379a8dcf030be8f52f99cadf7e397ba8
	Issue introduced in 6.15 with commit 1d191b4ca51d73699cb127386b95ac152af2b930 and fixed in 6.17 with commit 131897c65e2b86cf14bec7379f44aa8fbb407526

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-39924
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	fs/erofs/zmap.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/db5d7abd379a8dcf030be8f52f99cadf7e397ba8
	https://git.kernel.org/stable/c/131897c65e2b86cf14bec7379f44aa8fbb407526