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 676A8330D4C for ; Fri, 8 May 2026 13:14:57 +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=1778246097; cv=none; b=qxAVSz5g6MDOBPSGEalbSlozH7mTdiP11iU7DQVblkDcr0G43sMbP3k3E22PgUjY6KTQp/0bhopCuOFl0fV8dt+n2h28E72S14ThYj8Fia6NmJToW0X24OTn8QU3XpMWdfoIJAAXKVgSRoXMdFKjxahZ/F6hwCRku+NbfYjUUt0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778246097; c=relaxed/simple; bh=q8OF3pRt7o+TBxKqWq+7DZscKp6YSD58GHO6JC1ydLc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=CsBDQb1/Sp7DmC1KKGGZ9xWEmejv+k20OkoZcmzssZaloNA+2RhSLxZC6H6itNLewkVJLzJptISexLotr6QOQEd4yO7KeqAC3lzoD1hrUKfUIr50+t/oewKlU/NNPyd4eqBImUj4YBqM0OE9GguGEiijaXSS1Ai/64ueuxDktNw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=0n/BtAeQ; 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="0n/BtAeQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F1D7DC2BCB0; Fri, 8 May 2026 13:14:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778246097; bh=q8OF3pRt7o+TBxKqWq+7DZscKp6YSD58GHO6JC1ydLc=; h=From:To:Cc:Subject:Date:Reply-To:From; b=0n/BtAeQq8eRnqjtYq6UUqCER1+KLxyqhta5zQ59v3du9gVQcPVJ5DcnpPoefLHlc YF6BRJZoMDfP9o2wtBuZyhfCj0tqtAyWoEkNljdRUCcQW30Py4i72KdHllE+N7S+Pj YPlpyJ6WWgAoKk5R8keaLIOuvFDCnIGymc8q9LMc= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-43313: ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4() Date: Fri, 8 May 2026 15:12:18 +0200 Message-ID: <2026050800-CVE-2026-43313-6ec3@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=3018; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=ljyYwnmD2Q/v1/yi/CXTWmkvTkaCZ4Sg/thcl90RCF4=; b=owGbwMvMwCRo6H6F97bub03G02pJDJl/HyquXTjxrkloENfilIjVv9w9lzG83jJj5V/GoLh8I d61WyJ6OmJZGASZGGTFFFm+bOM5ur/ikKKXoe1pmDmsTCBDGLg4BWAiPxMZFrQ0L1MXeioY8OXx e5l5GpeNv35eV80wP78tM+GCkMoC7zn5Vcpm81w09/5iBAA= 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: ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4() In acpi_processor_errata_piix4(), the pointer dev is first assigned an IDE device and then reassigned an ISA device: dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB, ...); dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB_0, ...); If the first lookup succeeds but the second fails, dev becomes NULL. This leads to a potential null-pointer dereference when dev_dbg() is called: if (errata.piix4.bmisx) dev_dbg(&dev->dev, ...); To prevent this, use two temporary pointers and retrieve each device independently, avoiding overwriting dev with a possible NULL value. [ rjw: Subject adjustment, added an empty code line ] The Linux kernel CVE team has assigned CVE-2026-43313 to this issue. Affected and fixed versions =========================== Fixed in 5.15.202 with commit 06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5 Fixed in 6.1.165 with commit ad86ac604f8391c0212a91412d4f764c7a85f254 Fixed in 6.6.128 with commit 01e8751b37a366b1ca561add0042f2ceb18c03bf Fixed in 6.12.75 with commit b803811485ac0b2f774b6bf3abc8b999ba3b7033 Fixed in 6.18.16 with commit 29f60d3d06818d40118a30d663231f027ae87a05 Fixed in 6.19.6 with commit 0398b641be2b66c2fc7e0163c606ef19372e7ad5 Fixed in 7.0 with commit f132e089fe89cadc2098991f0a3cb05c3f824ac6 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-2026-43313 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/acpi/acpi_processor.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/06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5 https://git.kernel.org/stable/c/ad86ac604f8391c0212a91412d4f764c7a85f254 https://git.kernel.org/stable/c/01e8751b37a366b1ca561add0042f2ceb18c03bf https://git.kernel.org/stable/c/b803811485ac0b2f774b6bf3abc8b999ba3b7033 https://git.kernel.org/stable/c/29f60d3d06818d40118a30d663231f027ae87a05 https://git.kernel.org/stable/c/0398b641be2b66c2fc7e0163c606ef19372e7ad5 https://git.kernel.org/stable/c/f132e089fe89cadc2098991f0a3cb05c3f824ac6