{"id":"CVE-2023-52813","summary":"crypto: pcrypt - Fix hungtask for PADATA_RESET","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: pcrypt - Fix hungtask for PADATA_RESET\n\nWe found a hungtask bug in test_aead_vec_cfg as follows:\n\nINFO: task cryptomgr_test:391009 blocked for more than 120 seconds.\n\"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\nCall trace:\n __switch_to+0x98/0xe0\n __schedule+0x6c4/0xf40\n schedule+0xd8/0x1b4\n schedule_timeout+0x474/0x560\n wait_for_common+0x368/0x4e0\n wait_for_completion+0x20/0x30\n wait_for_completion+0x20/0x30\n test_aead_vec_cfg+0xab4/0xd50\n test_aead+0x144/0x1f0\n alg_test_aead+0xd8/0x1e0\n alg_test+0x634/0x890\n cryptomgr_test+0x40/0x70\n kthread+0x1e0/0x220\n ret_from_fork+0x10/0x18\n Kernel panic - not syncing: hung_task: blocked tasks\n\nFor padata_do_parallel, when the return err is 0 or -EBUSY, it will call\nwait_for_completion(&wait-\u003ecompletion) in test_aead_vec_cfg. In normal\ncase, aead_request_complete() will be called in pcrypt_aead_serial and the\nreturn err is 0 for padata_do_parallel. But, when pinst-\u003eflags is\nPADATA_RESET, the return err is -EBUSY for padata_do_parallel, and it\nwon't call aead_request_complete(). Therefore, test_aead_vec_cfg will\nhung at wait_for_completion(&wait-\u003ecompletion), which will cause\nhungtask.\n\nThe problem comes as following:\n(padata_do_parallel)                 |\n    rcu_read_lock_bh();              |\n    err = -EINVAL;                   |   (padata_replace)\n                                     |     pinst-\u003eflags |= PADATA_RESET;\n    err = -EBUSY                     |\n    if (pinst-\u003eflags & PADATA_RESET) |\n        rcu_read_unlock_bh()         |\n        return err\n\nIn order to resolve the problem, we replace the return err -EBUSY with\n-EAGAIN, which means parallel_data is changing, and the caller should call\nit again.\n\nv3:\nremove retry and just change the return err.\nv2:\nintroduce padata_try_do_parallel() in pcrypt_aead_encrypt and\npcrypt_aead_decrypt to solve the hungtask.","modified":"2026-03-20T12:32:48.169530Z","published":"2024-05-21T15:31:21.604Z","related":["ALSA-2024:4352","SUSE-SU-2024:2571-1","SUSE-SU-2024:2896-1","SUSE-SU-2024:2973-1","SUSE-SU-2025:03204-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52813.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/039fec48e062504f14845124a1a25eb199b2ddc0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/372636debe852913529b1716f44addd94fff2d28"},{"type":"WEB","url":"https://git.kernel.org/stable/c/546c1796ad1ed0d87dab3c4b5156d75819be2316"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8f4f68e788c3a7a696546291258bfa5fdb215523"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c55fc098fd9d2dca475b82d00ffbcaf97879d77e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c9c1334697301c10e6918d747ed38abfbc0c96e7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e134f3aba98e6c801a693f540912c2d493718ddf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e97bf4ada7dddacd184c3e196bd063b0dc71b41d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fb2d3a50a8f29a3c66682bb426144f40e32ab818"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52813.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-52813"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"16295bec6398a3eedc9377e1af6ff4c71b98c300"},{"fixed":"fb2d3a50a8f29a3c66682bb426144f40e32ab818"},{"fixed":"039fec48e062504f14845124a1a25eb199b2ddc0"},{"fixed":"c9c1334697301c10e6918d747ed38abfbc0c96e7"},{"fixed":"e97bf4ada7dddacd184c3e196bd063b0dc71b41d"},{"fixed":"546c1796ad1ed0d87dab3c4b5156d75819be2316"},{"fixed":"c55fc098fd9d2dca475b82d00ffbcaf97879d77e"},{"fixed":"e134f3aba98e6c801a693f540912c2d493718ddf"},{"fixed":"372636debe852913529b1716f44addd94fff2d28"},{"fixed":"8f4f68e788c3a7a696546291258bfa5fdb215523"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-52813.json"}}],"schema_version":"1.7.5"}