{"schema_version":"1.9.0","id":"CVE-2023-52854","published":"2024-05-21T15:31:49.235Z","modified":"2026-08-12T03:51:34.251462681Z","related":["SUSE-SU-2024:2008-1","SUSE-SU-2024:2011-1","SUSE-SU-2024:2019-1","SUSE-SU-2024:2189-1","SUSE-SU-2024:2190-1","SUSE-SU-2024:2571-1","SUSE-SU-2024:2896-1","SUSE-SU-2024:2973-1","SUSE-SU-2024:3225-1","SUSE-SU-2024:3249-1","SUSE-SU-2024:3499-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1"],"summary":"padata: Fix refcnt handling in padata_free_shell()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\npadata: Fix refcnt handling in padata_free_shell()\n\nIn a high-load arm64 environment, the pcrypt_aead01 test in LTP can lead\nto system UAF (Use-After-Free) issues. Due to the lengthy analysis of\nthe pcrypt_aead01 function call, I'll describe the problem scenario\nusing a simplified model:\n\nSuppose there's a user of padata named `user_function` that adheres to\nthe padata requirement of calling `padata_free_shell` after `serial()`\nhas been invoked, as demonstrated in the following code:\n\n```c\nstruct request {\n    struct padata_priv padata;\n    struct completion *done;\n};\n\nvoid parallel(struct padata_priv *padata) {\n    do_something();\n}\n\nvoid serial(struct padata_priv *padata) {\n    struct request *request = container_of(padata,\n    \t\t\t\tstruct request,\n\t\t\t\tpadata);\n    complete(request->done);\n}\n\nvoid user_function() {\n    DECLARE_COMPLETION(done)\n    padata->parallel = parallel;\n    padata->serial = serial;\n    padata_do_parallel();\n    wait_for_completion(&done);\n    padata_free_shell();\n}\n```\n\nIn the corresponding padata.c file, there's the following code:\n\n```c\nstatic void padata_serial_worker(struct work_struct *serial_work) {\n    ...\n    cnt = 0;\n\n    while (!list_empty(&local_list)) {\n        ...\n        padata->serial(padata);\n        cnt++;\n    }\n\n    local_bh_enable();\n\n    if (refcount_sub_and_test(cnt, &pd->refcnt))\n        padata_free_pd(pd);\n}\n```\n\nBecause of the high system load and the accumulation of unexecuted\nsoftirq at this moment, `local_bh_enable()` in padata takes longer\nto execute than usual. Subsequently, when accessing `pd->refcnt`,\n`pd` has already been released by `padata_free_shell()`, resulting\nin a UAF issue with `pd->refcnt`.\n\nThe fix is straightforward: add `refcount_dec_and_test` before calling\n`padata_free_pd` in `padata_free_shell`.","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"07928d9bfc81640bab36f5190e8725894d93b659"},{"fixed":"41aad9d6953984d134fc50f631f24ef476875d4d"},{"fixed":"0dd34a7ad395dbcf6ae60e48e9786050e25b9bc5"},{"fixed":"c7c26d0ef5d20f00dbb2ae3befcabbe0efa77275"},{"fixed":"1e901bcb8af19416b65f5063a4af7996e5a51d7f"},{"fixed":"1734a79e951914f1db2c65e635012a35db1c674b"},{"fixed":"7ddc21e317b360c3444de3023bcc83b85fabae2f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"13721e447acc2b82c19cf72e9e6c4291c77693ed"},{"last_affected":"7a2ccb65f90168edc2348495bb56093c466ffa39"},{"last_affected":"928cf3d733c4efc221e1a78b14cb2ee066627260"},{"last_affected":"c9da8ee1491719001a444f4af688b75e72b58418"},{"last_affected":"dc34710a7aba5207e7cb99d11588c04535b3c53d"},{"last_affected":"5fefc9b3e3584a1ce98da27c38e1b8dda1939d74"},{"last_affected":"26daf8e6515c2dcd25d235468420b9f46e0acdac"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.16.84"},{"fixed":"3.17"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.4.215"},{"fixed":"4.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.9.215"},{"fixed":"4.10"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.14.172"},{"fixed":"4.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.19.103"},{"fixed":"4.20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.19"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.5.3"},{"fixed":"5.6"}]}],"versions":["v3.16.83","v3.16.82","v4.14.171","v4.9.214","v4.4.214","v4.14.170","v4.9.213","v4.4.213","v3.16.81","v5.5.2","v5.4.18","v4.19.102","v5.5","v5.4.17","v4.19.101","v4.14.169","v4.9.212","v4.4.212","v5.5.1","v5.5-rc5","v4.19.100","v5.4.16","v5.5-rc7","v5.5-rc2","v5.5-rc1","v5.4.15","v4.19.99","v4.14.168","v4.9.211","v4.4.211","v5.4","v4.19.98","v4.14.167","v5.4.14","v5.5-rc4","v5.4.13","v4.19.97","v4.14.166","v4.9.210","v4.4.210","v5.5-rc3","v5.5-rc6","v5.4.12","v4.19.96","v4.14.165","v5.4.11","v4.19.95","v4.14.164","v4.9.209","v4.4.209","v5.4.10","v4.19.94","v4.14.163","v4.9.208","v4.4.208","v3.16.80","v5.4.9","v5.4.8","v4.19.93","v4.14.162","v5.4.7","v4.19.92","v4.14.161","v4.9.207","v4.4.207","v5.4.6","v4.19.91","v4.14.160","v5.4.5","v4.19.90","v4.14.159","v4.9.206","v4.4.206","v3.16.79","v5.4.4","v4.14.158","v4.19.89","v5.4.3","v4.19.88","v5.4.2","v3.16.78","v5.4-rc1","v4.14.157","v4.9.205","v4.4.205","v4.19.87","v5.4.1","v5.4-rc6","v5.4-rc3","v4.19.86","v4.14.156","v4.9.204","v4.4.204","v4.9.203","v4.4.203","v5.4-rc4","v5.4-rc8","v4.4.202","v4.9.202","v4.14.155","v4.19.85","v3.16.77","v4.19.84","v4.14.154","v5.4-rc7","v4.9.201","v4.4.201","v5.4-rc5","v3.16.76","v5.3","v5.4-rc2","v4.19.83","v4.14.153","v4.9.200","v4.4.200","v4.19.82","v4.14.152","v4.9.199","v4.4.199","v4.19.81","v4.14.151","v4.9.198","v4.4.198","v3.16.75","v4.19.80","v4.14.150","v4.9.197","v4.4.197","v4.19.79","v4.14.149","v4.9.196","v4.4.196","v4.19.78","v4.14.148","v4.4.195","v4.19.77","v4.14.147","v4.9.195","v3.16.74","v4.19.76","v4.14.146","v4.9.194","v4.4.194","v4.19.75","v5.3-rc5","v5.3-rc1","v3.16.73","v4.19.74","v4.14.145","v4.9.193","v4.4.193","v5.3-rc2","v4.19.73","v4.14.144","v5.3-rc3","v5.3-rc8","v4.19.72","v4.14.143","v4.9.192","v4.4.192","v5.3-rc7","v5.3-rc4","v4.19.71","v4.14.142","v4.9.191","v4.4.191","v4.19.70","v4.19.69","v4.14.141","v4.9.190","v4.4.190","v5.2","v5.3-rc6","v4.19.68","v4.14.140","v4.4.189","v4.9.189","v4.14.139","v4.19.67","v3.16.72","v4.14.138","v4.19.66","v3.16.71","v4.9.188","v4.4.188","v4.14.137","v4.19.65","v4.19.64","v4.14.136","v4.9.187","v4.4.187","v4.4.186","v4.9.186","v4.14.135","v4.19.63","v4.14.134","v4.19.62","v4.19.61","v4.19.60","v5.2-rc2","v3.16.70","v4.4.185","v4.9.185","v4.14.133","v4.19.59","v5.2-rc7","v5.2-rc4","v4.19.58","v5.2-rc1","v4.4.184","v4.9.184","v4.14.132","v4.19.57","v3.16.69","v5.2-rc5","v5.2-rc6","v4.14.131","v4.19.56","v5.2-rc3","v4.14.130","v4.9.183","v4.4.183","v4.14.129","v4.19.55","v5.1","v4.19.54","v4.4.182","v4.9.182","v4.14.128","v4.19.53","v3.16.68","v4.14.127","v4.19.52","v4.4.181","v4.9.181","v4.14.126","v4.19.51","v4.14.125","v4.19.50","v4.4.180","v4.9.180","v4.14.124","v4.19.49","v4.14.123","v4.19.48","v4.19.47","v4.9.179","v4.14.122","v4.19.46","v4.9.178","v4.14.121","v4.19.45","v3.16.67","v4.19.44","v4.14.120","v4.9.177","v4.4.179","v4.9.176","v4.14.119","v4.19.43","v5.0-rc8","v4.9.175","v4.14.118","v4.19.42","v5.1-rc7","v5.1-rc1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