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 4127A3EF0AD for ; Fri, 8 May 2026 14:23:15 +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=1778250195; cv=none; b=HQIgCeWiS83Rrt/xr2in7mF9JbDt1q6Wa9axpeh8Fs70LclT1kazOQwnUz9wXjukFB2XBLBaapeoAt6zZnctW9FnU6MBHcPjYNY5kr+VGxdDKNgOTP6XsQVNsjCJuWShDEE2MJF4YBf1CA+JLufNIdhwIU0kVyUEEnVSbb/99cs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778250195; c=relaxed/simple; bh=Kd3YjqsYw6mcUH1CN/yPQbHnlmpFWk1X6JI18c1qX08=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=j7Or/h0cust+TuewCIgP37CJvwp9aI6UxNRq+rRLBb/CpcqIC0oiWQdQWSWC8J5S1alk7qua/pdS5ny5PuYB6ohHLYruJOt0DgdERnMMtGUxbKLAZETWIUH2d2XIA2OqxPBu9fR9OwwMGry/ZmWkABtwo5IPtjY51HN+KlcljJU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=DBCRfHec; 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="DBCRfHec" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 953B9C2BCC7; Fri, 8 May 2026 14:23:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778250194; bh=Kd3YjqsYw6mcUH1CN/yPQbHnlmpFWk1X6JI18c1qX08=; h=From:To:Cc:Subject:Date:Reply-To:From; b=DBCRfHecmPUHlfBlIGOBiybjF57bWm7TEcJ7uTLaI3w7hySfXPnNuUH2JjkptPCDI IShN9kHbJ2QsDHs28LoFC7QsjeAVxGFTHSyk00qufbMVhKaX5OerqdcLp1AmBTJRHz ugkg9sWYdbSFDGjPT6pMxfWPL3zm8ii/kUtSRKcA= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-43380: hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read Date: Fri, 8 May 2026 16:21:49 +0200 Message-ID: <2026050832-CVE-2026-43380-d98b@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=3831; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=h3/vXWMPGl754QPEQcchBqI4c7mM8doRdG05LHySxss=; b=owGbwMvMwCRo6H6F97bub03G02pJDJl/P+b2iPannJu/acEkwehHLwwjF9c+/rXASY6H0Skt6 tG7wg3XOmJZGASZGGTFFFm+bOM5ur/ikKKXoe1pmDmsTCBDGLg4BWAi+90Z5mmf/P7DsVtRXf/M W1eG8gWnNfYL72SYHzJxL/+zY5VHO4wlnt6f53H/H/fFIAA= 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: hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read The q54sj108a2_debugfs_read function suffers from a stack buffer overflow due to incorrect arguments passed to bin2hex(). The function currently passes 'data' as the destination and 'data_char' as the source. Because bin2hex() converts each input byte into two hex characters, a 32-byte block read results in 64 bytes of output. Since 'data' is only 34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end of the buffer onto the stack. Additionally, the arguments were swapped: it was reading from the zero-initialized 'data_char' and writing to 'data', resulting in all-zero output regardless of the actual I2C read. Fix this by: 1. Expanding 'data_char' to 66 bytes to safely hold the hex output. 2. Correcting the bin2hex() argument order and using the actual read count. 3. Using a pointer to select the correct output buffer for the final simple_read_from_buffer call. The Linux kernel CVE team has assigned CVE-2026-43380 to this issue. Affected and fixed versions =========================== Issue introduced in 5.11 with commit d014538aa38561cd24c5eb228223585f26c5ec71 and fixed in 5.15.203 with commit a0fc1b9c738fba231f190ab960c83202722efee5 Issue introduced in 5.11 with commit d014538aa38561cd24c5eb228223585f26c5ec71 and fixed in 6.1.167 with commit c59090c50f62a17129fc4c5407bc4071305a9e82 Issue introduced in 5.11 with commit d014538aa38561cd24c5eb228223585f26c5ec71 and fixed in 6.6.130 with commit 52db5ef163c96f916d424e472fb17aadc35a9f7a Issue introduced in 5.11 with commit d014538aa38561cd24c5eb228223585f26c5ec71 and fixed in 6.12.78 with commit b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b Issue introduced in 5.11 with commit d014538aa38561cd24c5eb228223585f26c5ec71 and fixed in 6.18.19 with commit 73a7a345816946d276ad2c46c8bb771de67cfc46 Issue introduced in 5.11 with commit d014538aa38561cd24c5eb228223585f26c5ec71 and fixed in 6.19.9 with commit 24a7b9daa103fa963b3fd37d8805b23e01621976 Issue introduced in 5.11 with commit d014538aa38561cd24c5eb228223585f26c5ec71 and fixed in 7.0 with commit 25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43 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-2026-43380 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: drivers/hwmon/pmbus/q54sj108a2.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/a0fc1b9c738fba231f190ab960c83202722efee5 https://git.kernel.org/stable/c/c59090c50f62a17129fc4c5407bc4071305a9e82 https://git.kernel.org/stable/c/52db5ef163c96f916d424e472fb17aadc35a9f7a https://git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b https://git.kernel.org/stable/c/73a7a345816946d276ad2c46c8bb771de67cfc46 https://git.kernel.org/stable/c/24a7b9daa103fa963b3fd37d8805b23e01621976 https://git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43