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 EBA0210A1F for ; Wed, 26 Feb 2025 02:27:27 +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=1740536848; cv=none; b=ZTGN1F+ergWfm6dY2jquInZZ5XUWxRKgYKtdIYa+9A2TUodoBHgE2Pl4xJauco26szitjcmqr4b6R9L4488kM6Qnjc5a76qxP54QpSgyASa3h6yIsz810lAwKOzH2mUtQ9jDX+2lGP4qXtT9dNFeyvoNrLdkGY2CWSZqu/AhoLI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740536848; c=relaxed/simple; bh=BAHX3yMo8tDrDto12gESFgkHlxTlNyLei8EoxOfHkXQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=GIE7O6+mdyYBq4b9PaMruRldJ0gYTywSmSwWbC8Qmi3s9CuetXYEKaLDRl/LiLuz6Ye1/H9TSU3Cd4l63JS6D+TEh3ydzC3mC2YYYL5qBaPZxGw5wTutUS7KLdBWD04jLryU/+JdeOrMS+X0AtQPQtO/P5OwDuTR4RcNpuieITw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Rdkqpszf; 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="Rdkqpszf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BB4E9C4CEDD; Wed, 26 Feb 2025 02:27:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1740536847; bh=BAHX3yMo8tDrDto12gESFgkHlxTlNyLei8EoxOfHkXQ=; h=From:To:Cc:Subject:Date:Reply-to:From; b=Rdkqpszfas197ePXyZuUBv2Va07D23ebcs7E+DGYSlK4PnT3m2nds4vdyQhQhCsb7 LkNqiVxIQWJb0X6i+gZDDuXt3bve9jlTf4yIOolQMN+HCHIoGchQDr2CbW0BetRgLD sq0iEQ9sisGySH52HHWK7W5E0cvBhBsZxdRyNZQg= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2022-49688: afs: Fix dynamic root getattr Date: Wed, 26 Feb 2025 03:24:11 +0100 Message-ID: <2025022627-CVE-2022-49688-5c71@gregkh> X-Mailer: git-send-email 2.48.1 Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Reply-to: , X-Developer-Signature: v=1; a=openpgp-sha256; l=3485; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=BAHX3yMo8tDrDto12gESFgkHlxTlNyLei8EoxOfHkXQ=; b=owGbwMvMwCRo6H6F97bub03G02pJDOn7qh7fPO0iOX0VTwSrhHOXWE7O9nNOsWcuSEhn6GacO J2XLmzcEcvCIMjEICumyPJlG8/R/RWHFL0MbU/DzGFlAhnCwMUpABM5+JhhQd//O5rPd/Xvu/jq aPyXLdt7jbabb2VYMKH41uM4yarKyp01D8LjCpqnLDk6HwA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit Description =========== In the Linux kernel, the following vulnerability has been resolved: afs: Fix dynamic root getattr The recent patch to make afs_getattr consult the server didn't account for the pseudo-inodes employed by the dynamic root-type afs superblock not having a volume or a server to access, and thus an oops occurs if such a directory is stat'd. Fix this by checking to see if the vnode->volume pointer actually points anywhere before following it in afs_getattr(). This can be tested by stat'ing a directory in /afs. It may be sufficient just to do "ls /afs" and the oops looks something like: BUG: kernel NULL pointer dereference, address: 0000000000000020 ... RIP: 0010:afs_getattr+0x8b/0x14b ... Call Trace: vfs_statx+0x79/0xf5 vfs_fstatat+0x49/0x62 The Linux kernel CVE team has assigned CVE-2022-49688 to this issue. Affected and fixed versions =========================== Issue introduced in 4.19.245 with commit b76ea7c06b24dcf97ea3379b6957d5b99c346ea0 and fixed in 4.19.250 with commit 65c24caf1b9f5b08397c6e805ec24ebc390c6e4d Issue introduced in 5.4.196 with commit dba1941f5bc3de6b460685155b89ae1182824fc8 and fixed in 5.4.202 with commit e3a232e5767051483ffad4cef7d0a89d292a192b Issue introduced in 5.10.118 with commit 61a4cc41e5c1b77d05a12798f8032050aa75f3c8 and fixed in 5.10.127 with commit 7b564e3254b7db5fbfbf11a824627a6c31b932b4 Issue introduced in 5.15.42 with commit 94bf8bfb009fad247d02f12e4c443411c8445412 and fixed in 5.15.51 with commit 2b2bba96526f25f2eba74ecadb031de2e05a83ce Issue introduced in 5.18 with commit 2aeb8c86d49967552394d5e723f87454cb53f501 and fixed in 5.18.8 with commit 7844ceada44eca740d31beb3d97b8511b1ca0a9b Issue introduced in 5.18 with commit 2aeb8c86d49967552394d5e723f87454cb53f501 and fixed in 5.19 with commit cb78d1b5efffe4cf97e16766329dd7358aed3deb Issue introduced in 5.17.10 with commit 9e655a8b874d7c56e02938ddb221b16e293793df 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-2022-49688 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: fs/afs/inode.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/65c24caf1b9f5b08397c6e805ec24ebc390c6e4d https://git.kernel.org/stable/c/e3a232e5767051483ffad4cef7d0a89d292a192b https://git.kernel.org/stable/c/7b564e3254b7db5fbfbf11a824627a6c31b932b4 https://git.kernel.org/stable/c/2b2bba96526f25f2eba74ecadb031de2e05a83ce https://git.kernel.org/stable/c/7844ceada44eca740d31beb3d97b8511b1ca0a9b https://git.kernel.org/stable/c/cb78d1b5efffe4cf97e16766329dd7358aed3deb