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 9C4753C9427 for ; Fri, 3 Apr 2026 15:27:28 +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=1775230048; cv=none; b=Fk91JiY0w2E6ddHONoX+1hjJRf0rgAlnfX9S2i11ZS8oetsofeqCKzuGl9UbFgv6WAZ90VnzUrJCOpZ/3yCuYkO3+u6SvaUXVWRQKBDNB1UtElrt89hgHLF0zozl8u4RY+XtWGWdUMgtr3WfzCzZ6J7QnmbhQvoZMQ+68Qw4r8w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775230048; c=relaxed/simple; bh=zwdf8JRg9H1Biom6Gl86lwISE/RrEYC1KTru+Z1ONbg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Y9X+E0MIYtWqh1bTx6Trggg79OXBqtwz+IvKXzjVoujVsy3+9IMk0TH0mSyeE/+RnQFveB7qWJLryXtuIrUGT6lNmeCQYZpw8CurOltbutCAvWZwbGzjE900vztdJR/a0MpHe2q5wWYaq5G0vh+SEV/OZoz5S6bC7FkDh6tvKwg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=yG8SrfgX; 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="yG8SrfgX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 10A8DC4CEF7; Fri, 3 Apr 2026 15:27:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1775230048; bh=zwdf8JRg9H1Biom6Gl86lwISE/RrEYC1KTru+Z1ONbg=; h=From:To:Cc:Subject:Date:Reply-To:From; b=yG8SrfgXFmfja/l5ty5MEq4lv0VKHjwRa3PI3YqOPe8dBHRjZXPYhO9VyHWddQshF j2aGY/+moLEG32yXasCFUziD8ba+ttTQO9ncVqgWuqqmXpI1vtDc5eprfJzXkRIBPL wkIbeTadFRRbdLqLDpQDzE34GHvvwF4oXsEPvFcE= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-23474: mtd: Avoid boot crash in RedBoot partition table parser Date: Fri, 3 Apr 2026 17:18:55 +0200 Message-ID: <2026040323-CVE-2026-23474-e350@gregkh> X-Mailer: git-send-email 2.53.0 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=3629; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=wxnGEpeyFE3JxPgpXXfIP0WDm7vHX8n1rhlKdbBmHgQ=; b=owGbwMvMwCRo6H6F97bub03G02pJDJnnb9m/PLekTTijYdPu1cJ/Ljz2r68RKYwSLp/h4ObxP u5xrOnNjlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZjIvgUMC3bNr7lkdPODLvPx Netf2P5xKFV31mFYcHRu+bn7M3YpZSQYadZLSM/leq57CwA= 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: mtd: Avoid boot crash in RedBoot partition table parser Given CONFIG_FORTIFY_SOURCE=y and a recent compiler, commit 439a1bcac648 ("fortify: Use __builtin_dynamic_object_size() when available") produces the warning below and an oops. Searching for RedBoot partition table in 50000000.flash at offset 0x7e0000 ------------[ cut here ]------------ WARNING: lib/string_helpers.c:1035 at 0xc029e04c, CPU#0: swapper/0/1 memcmp: detected buffer overflow: 15 byte read of buffer size 14 Modules linked in: CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.19.0 #1 NONE As Kees said, "'names' is pointing to the final 'namelen' many bytes of the allocation ... 'namelen' could be basically any length at all. This fortify warning looks legit to me -- this code used to be reading beyond the end of the allocation." Since the size of the dynamic allocation is calculated with strlen() we can use strcmp() instead of memcmp() and remain within bounds. The Linux kernel CVE team has assigned CVE-2026-23474 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.1.167 with commit 0b08be5aca212a99f8ba786fee4922feac08002c Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.6.130 with commit d8570211a2b1ec886a462daa0be4e9983ac768bb Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.12.78 with commit 2025b2d1f9d5cad6ea6fe85654c6c41297c3130b Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.18.20 with commit c4054ad2d8bff4e8e937cd4a1d1a04c1e8f77a2c Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.19.10 with commit 75a4d8cfe7784f909b3bd69325abac8e04ecb385 Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 7.0-rc5 with commit 8e2f8020270af7777d49c2e7132260983e4fc566 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-2026-23474 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/mtd/parsers/redboot.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/0b08be5aca212a99f8ba786fee4922feac08002c https://git.kernel.org/stable/c/d8570211a2b1ec886a462daa0be4e9983ac768bb https://git.kernel.org/stable/c/2025b2d1f9d5cad6ea6fe85654c6c41297c3130b https://git.kernel.org/stable/c/c4054ad2d8bff4e8e937cd4a1d1a04c1e8f77a2c https://git.kernel.org/stable/c/75a4d8cfe7784f909b3bd69325abac8e04ecb385 https://git.kernel.org/stable/c/8e2f8020270af7777d49c2e7132260983e4fc566