发布于3月6日3月6日 Members Ubuntu: (CVE-2021-47334): linux vulnerability Severity 7 CVSS (AV:L/AC:L/Au:S/C:C/I:C/A:C) Published 05/21/2024 Created 11/21/2024 Added 11/19/2024 Modified 02/11/2025 Description In the Linux kernel, the following vulnerability has been resolved: misc/libmasm/module: Fix two use after free in ibmasm_init_one In ibmasm_init_one, it calls ibmasm_init_remote_input_dev(). Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are allocated by input_allocate_device(), and assigned to sp->remote.mouse_dev and sp->remote.keybd_dev respectively. In the err_free_devices error branch of ibmasm_init_one, mouse_dev and keybd_dev are freed by input_free_device(), and return error. Then the execution runs into error_send_message error branch of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev. My patch add a "error_init_remote" label to handle the error of ibmasm_init_remote_input_dev(), to avoid the uaf bugs. Solution(s) ubuntu-upgrade-linux ubuntu-upgrade-linux-aws ubuntu-upgrade-linux-aws-5-4 ubuntu-upgrade-linux-aws-fips ubuntu-upgrade-linux-aws-hwe ubuntu-upgrade-linux-azure ubuntu-upgrade-linux-azure-4-15 ubuntu-upgrade-linux-azure-5-4 ubuntu-upgrade-linux-azure-fips ubuntu-upgrade-linux-bluefield ubuntu-upgrade-linux-fips ubuntu-upgrade-linux-gcp ubuntu-upgrade-linux-gcp-4-15 ubuntu-upgrade-linux-gcp-5-4 ubuntu-upgrade-linux-gcp-fips ubuntu-upgrade-linux-gkeop ubuntu-upgrade-linux-hwe ubuntu-upgrade-linux-hwe-5-4 ubuntu-upgrade-linux-ibm ubuntu-upgrade-linux-kvm ubuntu-upgrade-linux-oracle ubuntu-upgrade-linux-oracle-5-4 ubuntu-upgrade-linux-raspi ubuntu-upgrade-linux-raspi-5-4 References https://attackerkb.com/topics/cve-2021-47334 CVE - 2021-47334 https://git.kernel.org/linus/7272b591c4cb9327c43443f67b8fbae7657dd9ae https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069 https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25a https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00d https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720e https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbab https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9ae https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274 https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3 https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12c https://www.cve.org/CVERecord?id=CVE-2021-47334 View more
