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 D79653AA4EB for ; Fri, 4 Sep 2026 15:15:21 +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=1788534923; cv=none; b=MWeiZc0HmuSwwdhf70+fprewNhQcIz9Sch5lpJ1fZraNMKN9Z7nDrMrseK4PdFxeOljfdPyJUnKq3TKHcKKUi5Uk2l5AMHyXlx71nRm6qUHTG/1PO1DXUknRqTV0pM3HKT82j9MRN4+fxBDCz7pBqS/oZvFw7rlF7X75H5hjmAQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788534923; c=relaxed/simple; bh=vqpJqC0cT7y3NSKnP2RA828aRJSOnU/4n9DhZHfIHLA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=rJr4iWtlzsegkI8QLLr+Io+mVv/tjkAn5N93JRLlQmNi5TnCZZSyqtxB2K7uBCsVbbab7zLIY+N9dj68muZT18bw8+ik2Y2lMrNr/8aGna6P2/JyvTbhRmiK5ueZ639lb+WLoSK/DYDzfdNFuRzsvwaL4foz9nTalCi4eyxCCwc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=eV78fpjg; 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="eV78fpjg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EEF9E1F00A3D; Fri, 4 Sep 2026 15:15:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788534921; bh=0/amp8ZL75tfafUSZd7vrNRdquRAtJfxYDSae6OsR7M=; h=From:To:Cc:Subject:Date:Reply-To; b=eV78fpjgmHbiUQJvFyfnUWzUOReFlUNmkv/KnELQ3Ru+m6MNLuchJMzqrwdlYA0G+ d5KNr8A7LZtZ9z+c0LGZD180YupGEsS1itMmYX9ihz0vKQoi9TqFdI1D4LyfwTXGFo zqh6xpBXwxXIE3PwDc+ZkdQdlwsHiaWcYKxPO6Gw= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-80781: HID: core: fix OOB read of field->usage in hid_set_field() Date: Fri, 4 Sep 2026 17:11:20 +0200 Message-ID: <2026090404-CVE-2026-80781-c97d@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=5009; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=iRNjcvWKQw1tg7AIOwG6duQvPQskcdwHMXLOaZ2foys=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmz7nd4CR09fu2QV8HdSTXSEZOzQ9Yt3misnPkovsHm7 PLEh6bbO2JZGASZGGTFFFm+bOM5ur/ikKKXoe1pmDmsTCBDGLg4BWAi194wzHe68qB7+bMOs7m+ HIekbmQxrjI9NY1hDp/C/pXzeH7YyK/aueDWrm9RZ4sd2gE= 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: HID: core: fix OOB read of field->usage in hid_set_field() hid_set_field() hands field->usage + offset to hid_dump_input() before the guard that bounds offset: hid_dump_input(field->report->device, field->usage + offset, value); if (offset >= field->report_count) { hid_err(...); return -1; } Under CONFIG_DEBUG_FS hid_dump_input() dereferences that pointer, with buf = hid_resolv_usage(usage->hid, NULL). The usage[] array is allocated inline with the hid_field in hid_register_field() and holds field->maxusage entries, so an offset past it reads off the end of the kvzalloc()ed allocation and into a neighbouring object. Had the guard run first, offset < report_count <= maxusage would already have confined the pointer to the array. A caller supplies such an offset today. picolcd_fb_send_tile() validates only report->maxfield before issuing hid_set_field(report->field[0], 11 + i, ...) for i = 0..31, so its offsets are fixed at 11..42 and are never checked against the bound field. When the device registers that field with fewer usages, the framebuffer deferred-io work drives the read on every tile. KASAN reports a 4-byte slab-out-of-bounds read in hid_dump_input() below hid_set_field(), and the same boot logs "offset (1) exceeds report_count (1)" from the guard that runs only afterwards. Move the hid_dump_input() call below the guard. Because field->maxusage >= field->report_count, the guard then establishes that field->usage + offset lies inside the array before it is dereferenced, for every caller and without changing behaviour on the valid path. Discovered by XBOW, triaged by Baul Lee The Linux kernel CVE team has assigned CVE-2026-80781 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.10.267 with commit 465544b3d6602cfbdc2305d5cbfb7f4954353b63 Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.15.218 with commit 4993e1ab85d7d3f4a40d81852170f9665483bbd8 Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.1.185 with commit 313ead1abed945544703b100a12c5a10fdf78409 Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.6.154 with commit c1d9c16af51cc6ff92a5a062617d3b022dd01078 Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.12.106 with commit a38212687519f2a72f43e62dec1348a690412404 Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.18.47 with commit 9a1d7c5f0d82e8665715d5e47c9410c6a97e3748 Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 7.1.11 with commit 5215ea00a747eca34cb2f603cfef91fef76c2558 Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 7.2.1 with commit cbcc0e8dea499e5ca86b583372ccb1815cccc570 Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 7.3-rc1 with commit a13cdb19fcb223ed41bdab3bab42b98dba87e90b 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-2026-80781 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/hid/hid-core.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/465544b3d6602cfbdc2305d5cbfb7f4954353b63 https://git.kernel.org/stable/c/4993e1ab85d7d3f4a40d81852170f9665483bbd8 https://git.kernel.org/stable/c/313ead1abed945544703b100a12c5a10fdf78409 https://git.kernel.org/stable/c/c1d9c16af51cc6ff92a5a062617d3b022dd01078 https://git.kernel.org/stable/c/a38212687519f2a72f43e62dec1348a690412404 https://git.kernel.org/stable/c/9a1d7c5f0d82e8665715d5e47c9410c6a97e3748 https://git.kernel.org/stable/c/5215ea00a747eca34cb2f603cfef91fef76c2558 https://git.kernel.org/stable/c/cbcc0e8dea499e5ca86b583372ccb1815cccc570 https://git.kernel.org/stable/c/a13cdb19fcb223ed41bdab3bab42b98dba87e90b