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 73CBDBA3D for ; Tue, 9 Dec 2025 00:04:34 +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=1765238674; cv=none; b=Qkm4SHuwo5iSDX/uhxc10vuyF+bIfWKJVFiylm7Mk4uCgr9H7MRqFXW+GyoYkIP1rHwILX7PJSk5v+nd6uM6QOL0AjwsYURBgwZ8GjijIh1tkNMsecIbxxgc6Btjt/VlPxnhKijdueCtAc1nxVwjULYy4C5ez1ghTzh36y2qsW0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765238674; c=relaxed/simple; bh=gxsgARURfS9pPc7eGUtsfj8Rh1Z6CN911ofe9XOSD0M=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=GHQppwCW0cCr0lK01ha1MKFhEox8BGArSzdzORUyjnHsVqtvGqu4LEVjGnSgSzq6KQ37nrEABJ1fZMfRMFHOIetQbTqkf4x52QZXYo9ry9hX/a3AfwUx2ks6i6J2PeKhIJwmJdPFSrQfwoKKO6bxgWExoK5MDuLsNA9KIAF+DPo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=yUP3OR88; 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="yUP3OR88" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C9098C4CEF1; Tue, 9 Dec 2025 00:04:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1765238674; bh=gxsgARURfS9pPc7eGUtsfj8Rh1Z6CN911ofe9XOSD0M=; h=From:To:Cc:Subject:Date:Reply-To:From; b=yUP3OR88HC85Y8nZtlLT3vQxeMtdodzSN/hA7afcA+IRiw0esyQtV1Rz05sH2qoDP /KrfYPXD4vddF2anc5C4ZQuA3cE4Nx+WVnKnioU6VmIPd9t2QbqkhpmuXs0o7JyETB 56IGtxBTsp7HI8yQ5aG10GkZvaHOZ8s6YH13Ac2w= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2023-53810: blk-mq: release crypto keyslot before reporting I/O complete Date: Tue, 9 Dec 2025 09:02:31 +0900 Message-ID: <2025120944-CVE-2023-53810-e48e@gregkh> X-Mailer: git-send-email 2.52.0 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=3779; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=VIlY0Vz+9NFfws828ABqOd6l+RA3hzjh8lBU2+uziuM=; b=owGbwMvMwCRo6H6F97bub03G02pJDJnmaS+Yl07Qv7KW/8uNY1s6bOflqIeuu5B2c+mRH0eZ6 x63Tphj3RHLwiDIxCArpsjyZRvP0f0VhxS9DG1Pw8xhZQIZwsDFKQATuXKeYb7LxhuTeILcQt36 iqrlzjosibzHksCw4Nwji45mX8O1RxvKPn16qexrqVa5HAA= 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: blk-mq: release crypto keyslot before reporting I/O complete Once all I/O using a blk_crypto_key has completed, filesystems can call blk_crypto_evict_key(). However, the block layer currently doesn't call blk_crypto_put_keyslot() until the request is being freed, which happens after upper layers have been told (via bio_endio()) the I/O has completed. This causes a race condition where blk_crypto_evict_key() can see 'slot_refs != 0' without there being an actual bug. This makes __blk_crypto_evict_key() hit the 'WARN_ON_ONCE(atomic_read(&slot->slot_refs) != 0)' and return without doing anything, eventually causing a use-after-free in blk_crypto_reprogram_all_keys(). (This is a very rare bug and has only been seen when per-file keys are being used with fscrypt.) There are two options to fix this: either release the keyslot before bio_endio() is called on the request's last bio, or make __blk_crypto_evict_key() ignore slot_refs. Let's go with the first solution, since it preserves the ability to report bugs (via WARN_ON_ONCE) where a key is evicted while still in-use. The Linux kernel CVE team has assigned CVE-2023-53810 to this issue. Affected and fixed versions =========================== Issue introduced in 5.8 with commit a892c8d52c02284076fbbacae6692aa5c5807d11 and fixed in 5.10.180 with commit 874bdf43b4a7dc5463c31508f62b3e42eb237b08 Issue introduced in 5.8 with commit a892c8d52c02284076fbbacae6692aa5c5807d11 and fixed in 5.15.111 with commit d206f79d9cd658665b37ce8134c6ec849ac7af0c Issue introduced in 5.8 with commit a892c8d52c02284076fbbacae6692aa5c5807d11 and fixed in 6.1.28 with commit 7d206ec7a04e8545828191b6ea8b49d3ea61391f Issue introduced in 5.8 with commit a892c8d52c02284076fbbacae6692aa5c5807d11 and fixed in 6.2.15 with commit b278570e2c59d538216f8b656e97680188a8fba4 Issue introduced in 5.8 with commit a892c8d52c02284076fbbacae6692aa5c5807d11 and fixed in 6.3.2 with commit 92d5d233b9ff531cf9cc36ab4251779e07adb633 Issue introduced in 5.8 with commit a892c8d52c02284076fbbacae6692aa5c5807d11 and fixed in 6.4 with commit 9cd1e566676bbcb8a126acd921e4e194e6339603 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-2023-53810 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: block/blk-crypto-internal.h block/blk-crypto.c block/blk-merge.c block/blk-mq.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/874bdf43b4a7dc5463c31508f62b3e42eb237b08 https://git.kernel.org/stable/c/d206f79d9cd658665b37ce8134c6ec849ac7af0c https://git.kernel.org/stable/c/7d206ec7a04e8545828191b6ea8b49d3ea61391f https://git.kernel.org/stable/c/b278570e2c59d538216f8b656e97680188a8fba4 https://git.kernel.org/stable/c/92d5d233b9ff531cf9cc36ab4251779e07adb633 https://git.kernel.org/stable/c/9cd1e566676bbcb8a126acd921e4e194e6339603