{"id":"CVE-2021-47334","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-47334","generatedAt":"2026-10-27T18:48:53.759Z","title":"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().","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmisc/libmasm/module: Fix two use after free in ibmasm_init_one\n\nIn ibmasm_init_one, it calls ibmasm_init_remote_input_dev().\nInside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are\nallocated by input_allocate_device(), and assigned to\nsp->remote.mouse_dev and sp->remote.keybd_dev respectively.\n\nIn the err_free_devices error branch of ibmasm_init_one,\nmouse_dev and keybd_dev are freed by input_free_device(), and return\nerror. Then the execution runs into error_send_message error branch\nof ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called\nto unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev.\n\nMy patch add a \"error_init_remote\" label to handle the error of\nibmasm_init_remote_input_dev(), to avoid the uaf bugs.","published":"2024-05-21T15:15:20.000Z","lastModified":"2026-06-17T04:17:13.000Z","status":"Analyzed","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-416"],"affected":["linux/linux kernel"],"epss":{"score":0.00278,"percentile":0.20052,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.28%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25a","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00d","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720e","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbab","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9ae","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12c","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25a","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00d","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720e","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbab","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9ae","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12c","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-47334","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}