From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 B4104552958 for ; Fri, 11 Sep 2026 19:49:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789156197; cv=none; b=l9w1ZfPdI1gduUK2fb3syigPS0cpDU28ET3M/CDRuDPFhex3BmAa1cVOC7z4V3iFxlHLieuUzgaIHsuu8Z4nwE8mCiCexvFPfygUG3AwV+kT7X13ZfSlKkCJ5w3ECnLda0+NBA9kXcOXZh2+LLapo98LIAs7Px3eM0pvQe+Pwro= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789156197; c=relaxed/simple; bh=3bVNkOFyQY6cB/GIQewKBE+CWD2x9Qhr5hShNmS+HiM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=GdKN6oXAEsiOKLGbFYn66Opox+INI2Ke41KoX0ZcnC8w0/2KR2I/3yF0l3KG3y2IQINdgGRlIMkffWiZ7/T0V7AiIVPlFlaFO1N40yvaUGoJxJo4SWW88InO1jdm3NuvW8gifUkZPtSbQdwtKGmKGuNW1oRE91PqQN5mXBBsnZc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=s+j/Saaz; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="s+j/Saaz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6ABD41F0089D; Fri, 11 Sep 2026 19:49:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789156178; bh=HTX3i4iUnWmT7JjzHrhURvtk3mzyU/NsiehDXC5Nbv4=; h=From:To:Cc:Subject:Date:Reply-To; b=s+j/SaazcWAs8Lf6Btj2tsJ9lxSDbSCeNy3QHGuVWakkKLx9mgAfSgi0SGpZXEA6n 73di9oU4SdmnYkqTgW1Pjzjmy7eBR5d/WIvPc6Gr2e97m4LW3c0/fG+4NSD4l6KtD7 VK1m/lOyqRlVxRMEefRAejRrQ0TF2TZTGrQzJM6g= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-81013: platform/x86: hp-bioscfg: fix heap OOB read on empty password write Date: Fri, 11 Sep 2026 21:41:59 +0200 Message-ID: <2026091153-CVE-2026-81013-55a4@gregkh> X-Mailer: git-send-email 2.55.0 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=3461; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=f7QVISPoKhbuKFjeLFG58vjScY+TReOA/zakpAM6OOs=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlLIt0Y99iGzSr95lUkIC46y2jG53wVHpd3229bBN/6N uud8ezHHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjARLT+GBZfZMtddWK7alCW1 1CnC3vX7XO+7HxgW9PIeDK7hdFp5voDfT4flQm31Hh8jAA== 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: platform/x86: hp-bioscfg: fix heap OOB read on empty password write validate_password_input() computes length = strlen(buf) and then checks buf[length - 1] to strip a trailing newline, without checking that length is nonzero first. Writing an empty string (a bare '\n') to current_password or new_password gives length == 0, and buf[length - 1] reads buf[-1], one byte before the heap allocation holding the copied input. KASAN confirms this directly: BUG: KASAN: slab-out-of-bounds in store_password_instance.constprop.0+0x223/0x2a0 [hp_bioscfg] Read of size 1 at addr ffff88811bd8da9f by task sh/13740 ... store_password_instance.constprop.0+0x223/0x2a0 [hp_bioscfg] current_password_store+0x14/0x20 [hp_bioscfg] ... The buggy address is located 23 bytes to the right of allocated 8-byte region [ffff88811bd8da80, ffff88811bd8da88) Reproduced identically via new_password_store. Execution continues past the bad read (the garbage byte only affects whether "length" is decremented by one), so the write completes and returns success; this is a pure information read past the buffer, not a crash, but it is still an out-of-bounds access KASAN correctly flags. Fix by only checking buf[length - 1] when length is nonzero. The Linux kernel CVE team has assigned CVE-2026-81013 to this issue. Affected and fixed versions =========================== Issue introduced in 6.6 with commit 8646a3b5ee3a5b384a22a721f37c24274d974045 and fixed in 6.12.109 with commit cecb8154bd5fa6c8ddbd1a4e8216bbc0f0eb9828 Issue introduced in 6.6 with commit 8646a3b5ee3a5b384a22a721f37c24274d974045 and fixed in 6.18.50 with commit 0f9aad08424882dd5714b53d29ae044060890752 Issue introduced in 6.6 with commit 8646a3b5ee3a5b384a22a721f37c24274d974045 and fixed in 7.2.4 with commit b699e5c1f63a9e79946c35598c8a6f7af2c356b8 Issue introduced in 6.6 with commit 8646a3b5ee3a5b384a22a721f37c24274d974045 and fixed in 7.3-rc1 with commit 2b2ec354f905c14e3270e8ec3ab50f7d8ad73bab 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-2026-81013 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/platform/x86/hp/hp-bioscfg/passwdobj-attributes.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/cecb8154bd5fa6c8ddbd1a4e8216bbc0f0eb9828 https://git.kernel.org/stable/c/0f9aad08424882dd5714b53d29ae044060890752 https://git.kernel.org/stable/c/b699e5c1f63a9e79946c35598c8a6f7af2c356b8 https://git.kernel.org/stable/c/2b2ec354f905c14e3270e8ec3ab50f7d8ad73bab