From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 810161B86E9 for ; Tue, 21 Jan 2025 12:18:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737461921; cv=none; b=M+95aZoM9gaD5LYks17of2gJpuG7gs85Q5PlJx5j2FglltaDTH1gd+IVlUGCNp19kt5tOFhyvnR3tyqkMebgNTValKdfE6xACgBXcDRiFwlWbSTet1gA2UmLmWfaoBpHH2ljISrEf7JfZBcAewp5bfYHxgCbI7kGFBwryJ6XU+o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737461921; c=relaxed/simple; bh=DX8msbFz+RzIYuTaxzY+h1WI5gGGnTNLLBYzm7GGrCs=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=AQayV4Wng024ankuiQDCQGfLfdDt2InbN1gzMMO8yJg1wSaLNxQ/HJ5VwVNJDw+Tr8OhK6HcjBgckLFa1NGTS7faFU6quXqKdYj7VXWn3fxSywTaSFN1NoE4JiAXeHZNeK2CqepOmHEU/e2vQNg4gVRVVF332fAqSLZpIEwP4F8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=npoyvFrV; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="npoyvFrV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7FAABC4CEDF; Tue, 21 Jan 2025 12:18:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1737461919; bh=DX8msbFz+RzIYuTaxzY+h1WI5gGGnTNLLBYzm7GGrCs=; h=From:To:Cc:Subject:Date:Reply-to:From; b=npoyvFrVU5ICOiVX6madgRU8ZTmCT4MpG0I3B/UG84Ph6BWER1Xt7gX248KzZLsu8 Thy1dYPL5DmhoYaMBU+U5fTXJKOgH4pKz7VBRk8WBUu+qSdH3PBrNcS1c7jobriPMI kEcCiOiLFlio9gDr2wl7qLn4PqCcCaUpHTFusqOQ= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2024-57940: exfat: fix the infinite loop in exfat_readdir() Date: Tue, 21 Jan 2025 13:18:29 +0100 Message-ID: <2025012128-CVE-2024-57940-e289@gregkh> X-Mailer: git-send-email 2.48.1 Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Reply-to: , X-Developer-Signature: v=1; a=openpgp-sha256; l=2702; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=DX8msbFz+RzIYuTaxzY+h1WI5gGGnTNLLBYzm7GGrCs=; b=owGbwMvMwCRo6H6F97bub03G02pJDOn9E6YcPXDsXfzp3xciTnx7sHhF2sJvPjM8L5evONl2X MGC9cSEjx2xLAyCTAyyYoosX7bxHN1fcUjRy9D2NMwcViaQIQxcnAIwkVJehgVTn6zn51Oc/GSx fF5yt/fpU29/spxjmB/yakN3d1Pmc+fJhSU2C/I/ffX0cgcA X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit Description =========== In the Linux kernel, the following vulnerability has been resolved: exfat: fix the infinite loop in exfat_readdir() If the file system is corrupted so that a cluster is linked to itself in the cluster chain, and there is an unused directory entry in the cluster, 'dentry' will not be incremented, causing condition 'dentry < max_dentries' unable to prevent an infinite loop. This infinite loop causes s_lock not to be released, and other tasks will hang, such as exfat_sync_fs(). This commit stops traversing the cluster chain when there is unused directory entry in the cluster to avoid this infinite loop. The Linux kernel CVE team has assigned CVE-2024-57940 to this issue. Affected and fixed versions =========================== Issue introduced in 5.7 with commit ca06197382bde0a3bc20215595d1c9ce20c6e341 and fixed in 6.1.125 with commit 31beabd0f47f8c3ed9965ba861c9e5b252d4920a Issue introduced in 5.7 with commit ca06197382bde0a3bc20215595d1c9ce20c6e341 and fixed in 6.6.72 with commit dc1d7afceb982e8f666e70a582e6b5aa806de063 Issue introduced in 5.7 with commit ca06197382bde0a3bc20215595d1c9ce20c6e341 and fixed in 6.12.10 with commit d9ea94f5cd117d56e573696d0045ab3044185a15 Issue introduced in 5.7 with commit ca06197382bde0a3bc20215595d1c9ce20c6e341 and fixed in 6.13 with commit fee873761bd978d077d8c55334b4966ac4cb7b59 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-2024-57940 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/exfat/dir.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/31beabd0f47f8c3ed9965ba861c9e5b252d4920a https://git.kernel.org/stable/c/dc1d7afceb982e8f666e70a582e6b5aa806de063 https://git.kernel.org/stable/c/d9ea94f5cd117d56e573696d0045ab3044185a15 https://git.kernel.org/stable/c/fee873761bd978d077d8c55334b4966ac4cb7b59