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 9AE66477E51 for ; Wed, 13 May 2026 15:09:21 +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=1778684961; cv=none; b=I9yfThc2GNN5R+4MpuC22b/uRARfH8UikZzlZbb4rTjXjFUONMCVrjBSPSu2du3+3ropUKvhbISyjBWPNCkUXCYS0WoD4iy7pURcg21ES8Qq+T/iDytsBYUfkM2MpVa1NZLtjM2h9glUlZ6V97JdI+KlQf89sdo63NEWnHP47VE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778684961; c=relaxed/simple; bh=Av4Cz2Y1paNM8jqkRzCfL0vBki91h6HJpAqhAngOP7g=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Eo/tyR5DpHkr4WPpRCWIMe6brXQ0ILs11XK1j5LPvN6+zuP/B9Fh55sa1/c8Qw0uVsX5PRalAj2zr/zezDA0sQunlBhyDEi4I+Ge7CsunoIuIgCuG+RH7G670xGqsqivO0Slx8ShRhFwR5l5XhKNDjiCix7Rn6pjqNHGcFMWoqI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Hy6mwuYb; 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="Hy6mwuYb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E73D9C19425; Wed, 13 May 2026 15:09:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778684961; bh=Av4Cz2Y1paNM8jqkRzCfL0vBki91h6HJpAqhAngOP7g=; h=From:To:Cc:Subject:Date:Reply-To:From; b=Hy6mwuYbuvrB8SDYU5t/H+/Lpa+BlwNlWlaaXBi98D4ODim53HYFIJqnTE9nmYVpS q3Kdyx1blc3BuN0695hQccJvB+of/JhXI4uOteN+SxAZ5b6lNUCssiqpGafUBOGzU5 uXhndxH+QgZDH0wSUyjNBnlVv8EGMXbkOjHopYq8= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-43484: mmc: core: Avoid bitfield RMW for claim/retune flags Date: Wed, 13 May 2026 17:08:52 +0200 Message-ID: <2026051349-CVE-2026-43484-9ebf@gregkh> X-Mailer: git-send-email 2.54.0 Reply-To: , Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3385; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=ZzEZZTYmspXtx011s98qqamcE0wB8noC6CivW+owI9Y=; b=owGbwMvMwCRo6H6F97bub03G02pJDFksUxhDZ5xe+PhQddrkb7+iLjOZ3Zr6+mvZ6bjkU2zys 95UKO1p7ohlYRBkYpAVU2T5so3n6P6KQ4pehranYeawMoEMYeDiFICJbJzOMD9Dfblff9KzH245 GQu/LnYQeH3y0AeGBfvnTHKOE2OJn+DZWy2zUerlsSeeLwA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman Description =========== In the Linux kernel, the following vulnerability has been resolved: mmc: core: Avoid bitfield RMW for claim/retune flags Move claimed and retune control flags out of the bitfield word to avoid unrelated RMW side effects in asynchronous contexts. The host->claimed bit shared a word with retune flags. Writes to claimed in __mmc_claim_host() or retune_now in mmc_mq_queue_rq() can overwrite other bits when concurrent updates happen in other contexts, triggering spurious WARN_ON(!host->claimed). Convert claimed, can_retune, retune_now and retune_paused to bool to remove shared-word coupling. The Linux kernel CVE team has assigned CVE-2026-43484 to this issue. Affected and fixed versions =========================== Issue introduced in 4.15 with commit 6c0cedd1ef9527ef13e66875746570e76a3188a7 and fixed in 5.15.203 with commit 41dce4dae583a8ce06a7ebf4ce704c46a142957c Issue introduced in 4.15 with commit 6c0cedd1ef9527ef13e66875746570e76a3188a7 and fixed in 6.1.167 with commit bb7fc2498c3bb25fa6a91f22f4760005325cfbd5 Issue introduced in 4.15 with commit 6c0cedd1ef9527ef13e66875746570e76a3188a7 and fixed in 6.6.130 with commit 270277c2ab631044867adb1bd2f2433d3892de6e Issue introduced in 4.15 with commit 6c0cedd1ef9527ef13e66875746570e76a3188a7 and fixed in 6.12.78 with commit 45038e03f15e992c48603fff8c6b1c9be5397ac9 Issue introduced in 4.15 with commit 6c0cedd1ef9527ef13e66875746570e76a3188a7 and fixed in 6.18.19 with commit 0e06cc511c61cff1591e5435a207759adcc76b6d Issue introduced in 4.15 with commit 6c0cedd1ef9527ef13e66875746570e76a3188a7 and fixed in 6.19.9 with commit d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc Issue introduced in 4.15 with commit 6c0cedd1ef9527ef13e66875746570e76a3188a7 and fixed in 7.0 with commit 901084c51a0a8fb42a3f37d2e9c62083c495f824 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-2026-43484 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: include/linux/mmc/host.h 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/41dce4dae583a8ce06a7ebf4ce704c46a142957c https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5 https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9 https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824