{"id":"CVE-2021-47334","state":"PUBLISHED","title":"misc/libmasm/module: Fix two use after free in ibmasm_init_one","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.","publishedAt":"2024-05-21T14:35:44.404Z","updatedAt":"2026-05-11T13:52:37.429Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"736ce43295682d060f2b93624b4a339f9af6aab1","status":"affected","lessThan":"1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069","versionType":"git"},{"version":"736ce43295682d060f2b93624b4a339f9af6aab1","status":"affected","lessThan":"29ba8e2ba89ee2862a26d91204dd5fe77ceee25a","versionType":"git"},{"version":"736ce43295682d060f2b93624b4a339f9af6aab1","status":"affected","lessThan":"5b06ca113bf197aab2ab61288f42506e0049fbab","versionType":"git"},{"version":"736ce43295682d060f2b93624b4a339f9af6aab1","status":"affected","lessThan":"481a76d4749ee3a27f902ba213fdcbb4bb39720e","versionType":"git"},{"version":"736ce43295682d060f2b93624b4a339f9af6aab1","status":"affected","lessThan":"38660031e80eaa6cc9370b031c180612f414b00d","versionType":"git"},{"version":"736ce43295682d060f2b93624b4a339f9af6aab1","status":"affected","lessThan":"b9c87ce3bc6331f82811a8cf8e930423c22523a3","versionType":"git"},{"version":"736ce43295682d060f2b93624b4a339f9af6aab1","status":"affected","lessThan":"ef1067d2baa847d53c9988510d99fb494de4d12c","versionType":"git"},{"version":"736ce43295682d060f2b93624b4a339f9af6aab1","status":"affected","lessThan":"a7268e8a227d5a4f0bd1584f556246b0224ab274","versionType":"git"},{"version":"736ce43295682d060f2b93624b4a339f9af6aab1","status":"affected","lessThan":"7272b591c4cb9327c43443f67b8fbae7657dd9ae","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/ibmasm/module.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.16","versionType":"semver"},{"version":"4.4.276","status":"unaffected","lessThanOrEqual":"4.4.*","versionType":"semver"},{"version":"4.9.276","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.240","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.198","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.134","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.52","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.12.19","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13.4","status":"unaffected","lessThanOrEqual":"5.13.*","versionType":"semver"},{"version":"5.14","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/ibmasm/module.c"]}],"references":["https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069","https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25a","https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbab","https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720e","https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00d","https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3","https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12c","https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274","https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9ae"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47334.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47334","state":"PUBLISHED","datePublished":"2024-05-21T14:35:44.404Z","dateUpdated":"2026-05-11T13:52:37.429Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T14:28:16.977Z"},"containers":{"cna":{"title":"misc/libmasm/module: 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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 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