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 4CD8F3F23B5 for ; Wed, 1 Jul 2026 13:35:01 +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=1782912902; cv=none; b=Kkf5OFlcpRA23Z6fPRySJZ+BFb7dnIjlkMb8Ck2XlSxjHWRBSXJFfMNYCVgI9Hoi/HYswy+ERTFV9uTsxckZnymvQU7k2Ib2IN7QLM9OwHwGA9T0kypItPITvj1STxUq+OWQRX4qowo27Xv4Wj2AUWBJKwjlc+f7csU5EoAoUdk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782912902; c=relaxed/simple; bh=Y42aE8W7/7d90EsituGFdH+xtvlaK5ThBmehQ+h+AMA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=d+KYHcWqDewo7gxf8sPgfrreAF1oqDO26ax9tZCNEz5OgDhRdWrQUbiUZ1kzrxBE/Ih7FhI9+V88WybSxaxfKYTH+25EfWTZQFh4p1Tm10mz6Ca8iNIX20HwotcdMRCAaq8Bp7fmDq6U7a6Yqeui7+t9fpgCraxoHozIl/zgm6E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=PGYUs4lX; 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="PGYUs4lX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AFEB61F00A3A; Wed, 1 Jul 2026 13:35:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1782912901; bh=dotScR3gYek7uV0dNG5RR6J6TSjgWjj6mdBf5eEVtyw=; h=From:To:Cc:Subject:Date:Reply-To; b=PGYUs4lXHE5wLPR97kZmBtGyEXj+l6RFo8dU0M7Im5ACtObOZwgqx5mFWjswFL78N uFhRIfcDjfTb7i9hii/MxX1bAR2raWIELieH0jdFPOmGRJv2hcOCbueQjTky026Rhy MNduS6vVJPNenVW4esLKRwbaBJ0E24AGM8jj9WdY= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-53343: ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow Date: Wed, 1 Jul 2026 15:34:58 +0200 Message-ID: <2026070144-CVE-2026-53343-e76a@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=3349; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=INypmS9Z353ADvbRBml1nwpDgiXKPcTeMdcrH44KPmM=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmu4qUbwvNefIu62Jhuxtt9fG664OV2fgH18NIJvgZ6o rwv+2I7YlkYBJkYZMUUWb5s4zm6v+KQopeh7WmYOaxMIEMYuDgFYCIX9Rjm5zawm66YWPvX+s1q z2n+L29dYNWYwTCH73zYUu8vci6XH0SabWR61HXkx7M6AA== 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: ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow Commit 44e9a3bb76e5 ("ARM: 9430/1: entry: Do a dummy read from VMAP shadow") added a dummy read from the KASAN VMAP stack shadow in __switch_to(). The read uses ldr, but the KASAN shadow address is byte-granular and is not guaranteed to be word aligned. ARMv5 faults unaligned word loads. With CONFIG_KASAN_VMALLOC and CONFIG_VMAP_STACK enabled, ARM926/VersatilePB crashes in __switch_to() with an alignment exception before reaching init. Use ldrb for the dummy shadow access. The code only needs to fault in the shadow mapping if the stack shadow is missing, so a byte load is sufficient and matches the granularity of KASAN shadow memory. The Linux kernel CVE team has assigned CVE-2026-53343 to this issue. Affected and fixed versions =========================== Issue introduced in 6.1.120 with commit 8fe148d39c127de3fb78dfa6da95a3608dfda454 and fixed in 6.1.176 with commit c0b8c148a7754826156993ed6442d31536ec86b4 Issue introduced in 6.6.64 with commit ef21187c0672a2b2cbec44f33bab9ec47d5c277c and fixed in 6.6.143 with commit c2e3aadc8fef7da068490597fc5582f8f362aeb2 Issue introduced in 6.12.4 with commit c86d26b4b089ca294b3b7d915a7da61edb77935f and fixed in 6.12.94 with commit c74990828d3c486ee44aaa68240eb3abff289d1c Issue introduced in 6.13 with commit 44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 and fixed in 6.18.36 with commit 517720913bd3c17a52cd55a740064f68455ab88e Issue introduced in 6.13 with commit 44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 and fixed in 7.0.13 with commit 2a4dc9a0ac3326e79fb58fdaae724b92127709a9 Issue introduced in 6.13 with commit 44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 and fixed in 7.1 with commit 77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6 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-2026-53343 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: arch/arm/kernel/entry-armv.S 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/c0b8c148a7754826156993ed6442d31536ec86b4 https://git.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2 https://git.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1c https://git.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88e https://git.kernel.org/stable/c/2a4dc9a0ac3326e79fb58fdaae724b92127709a9 https://git.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6