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 556CE5947F8 for ; Fri, 11 Sep 2026 20:04:49 +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=1789157095; cv=none; b=OM2M8OtuU2PzblZULtf5ued0k1OZodzquJhDXB6vWh+VJfzKMdpzjN8tju8PYuJRM6MfMPbekm7yoT/QDcaJyQ+hGiFZVgNKvrpxYl/fUDDH001npDnjG4/+j1+1ZyaU4Mp1JHcf/ZP4PmaeJdm7OPG4YM970KFXk6C2jfWZlUE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789157095; c=relaxed/simple; bh=INPBbxi2e7ZIyb2j2w3F6HZDN9i8BhsMwEudvH4VX+c=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=mBE7SM85pUNkdpJ6WTkyukjBOnJZ337ug41bLIYK6anKthgJVeGXjhUfLIwa/hxjcMdP2OHRLFxS33HoKfgFbMjqX+xKF+oc8EglKogGeYfOs+Rv3KDHL9+6fRCAKXe/5liE0/43vwqEbcPFjt+DREBy1c9tP0fxa8MW9V4A9S8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=uNtS9GeQ; 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="uNtS9GeQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 223A11F0089A; Fri, 11 Sep 2026 20:04:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789157087; bh=79Ia8BnLac+RB5JoYEj6YLsArKZ3a+4nEIoVqQSeyPQ=; h=From:To:Cc:Subject:Date:Reply-To; b=uNtS9GeQw4c3h3HoWqZiQDkxGSeMOybqwyrBMg74Lz3EZNE/CXXXaGa5TpzUTZjcM 89yFm6SI1F99eKmrp3WUvwCIVL1YthVWn96Fpxb/aZUoVDcyrYv3bchF54finSWsKM +bqggS60d9hp4L80qUhfzBngLJ8TYcsHjFEnGDlA= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-89731: cxl/ras: Fix cxl_rch_get_aer_info() out-of-bounds AER register read Date: Fri, 11 Sep 2026 21:47:00 +0200 Message-ID: <2026091102-CVE-2026-89731-da40@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=2982; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=BFqw25bozfs3L31gR6dCoS22M9c/91gWBmYSRkdD/nc=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlLIrs+pTypC9gevbbxr7r5s38zLFudXSbqnc6R2LPhf 8omLjXNjlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZiIRSTD/AilK0lH/u6xbf6d ZvhO6U/sk8CiEob5+eKxrpc+nP3jec038KP+3I3rTqx9CwA= 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: cxl/ras: Fix cxl_rch_get_aer_info() out-of-bounds AER register read cxl_rch_get_aer_info() copies the RCH Downstream Port AER capability from the RCRB MMIO block using a readl() loop bounded by sizeof(struct aer_capability_regs). This struct is a software layout and its embedded struct pcie_tlp_log is larger than the on-wire AER capability. As a result the loop reads past the mapped AER register block. The over-read also populates the software-only tail fields including header_log.header_len. An out-of-range header_len passed to pcie_print_tlp_log() can then loop past the header log buffer and cause a second out-of-bounds read. The read was correct when introduced, but struct pcie_tlp_log has since grown (Header Log and TLP Prefix Log sizes, header_len and flit fields), so sizeof(struct aer_capability_regs) no longer matches the physical AER capability. Bound the read to the physical AER registers, header through the 16 byte Header Log. Zero the destination first so the software-only fields are deterministic. The Linux kernel CVE team has assigned CVE-2026-89731 to this issue. Affected and fixed versions =========================== Issue introduced in 6.7 with commit 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab and fixed in 6.18.51 with commit 8bd3523df1319edc61cd391e695c84a4618516df Issue introduced in 6.7 with commit 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab and fixed in 7.2.4 with commit 8e3d9dbb25d3ddbe72b4542ec4f7c4e622fe0ced Issue introduced in 6.7 with commit 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab and fixed in 7.3-rc1 with commit 29458e62d0829cbc99435f3e44fd560f9bbf1da7 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-2026-89731 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/cxl/core/ras_rch.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/8bd3523df1319edc61cd391e695c84a4618516df https://git.kernel.org/stable/c/8e3d9dbb25d3ddbe72b4542ec4f7c4e622fe0ced https://git.kernel.org/stable/c/29458e62d0829cbc99435f3e44fd560f9bbf1da7