{"id":"CVE-2023-52813","state":"PUBLISHED","title":"crypto: pcrypt - Fix hungtask for PADATA_RESET","description":"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 > /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->completion) 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->flags 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->completion), 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->flags |= PADATA_RESET;\n    err = -EBUSY                     |\n    if (pinst->flags & 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.","publishedAt":"2024-05-21T15:31:21.604Z","updatedAt":"2026-05-11T19:33:36.420Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"16295bec6398a3eedc9377e1af6ff4c71b98c300","status":"affected","lessThan":"fb2d3a50a8f29a3c66682bb426144f40e32ab818","versionType":"git"},{"version":"16295bec6398a3eedc9377e1af6ff4c71b98c300","status":"affected","lessThan":"039fec48e062504f14845124a1a25eb199b2ddc0","versionType":"git"},{"version":"16295bec6398a3eedc9377e1af6ff4c71b98c300","status":"affected","lessThan":"c9c1334697301c10e6918d747ed38abfbc0c96e7","versionType":"git"},{"version":"16295bec6398a3eedc9377e1af6ff4c71b98c300","status":"affected","lessThan":"e97bf4ada7dddacd184c3e196bd063b0dc71b41d","versionType":"git"},{"version":"16295bec6398a3eedc9377e1af6ff4c71b98c300","status":"affected","lessThan":"546c1796ad1ed0d87dab3c4b5156d75819be2316","versionType":"git"},{"version":"16295bec6398a3eedc9377e1af6ff4c71b98c300","status":"affected","lessThan":"c55fc098fd9d2dca475b82d00ffbcaf97879d77e","versionType":"git"},{"version":"16295bec6398a3eedc9377e1af6ff4c71b98c300","status":"affected","lessThan":"e134f3aba98e6c801a693f540912c2d493718ddf","versionType":"git"},{"version":"16295bec6398a3eedc9377e1af6ff4c71b98c300","status":"affected","lessThan":"372636debe852913529b1716f44addd94fff2d28","versionType":"git"},{"version":"16295bec6398a3eedc9377e1af6ff4c71b98c300","status":"affected","lessThan":"8f4f68e788c3a7a696546291258bfa5fdb215523","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["crypto/pcrypt.c","kernel/padata.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.34","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.34","versionType":"semver"},{"version":"4.14.331","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.300","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.262","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.202","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.140","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.64","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.5.13","status":"unaffected","lessThanOrEqual":"6.5.*","versionType":"semver"},{"version":"6.6.3","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["crypto/pcrypt.c","kernel/padata.c"]}],"references":["https://git.kernel.org/stable/c/fb2d3a50a8f29a3c66682bb426144f40e32ab818","https://git.kernel.org/stable/c/039fec48e062504f14845124a1a25eb199b2ddc0","https://git.kernel.org/stable/c/c9c1334697301c10e6918d747ed38abfbc0c96e7","https://git.kernel.org/stable/c/e97bf4ada7dddacd184c3e196bd063b0dc71b41d","https://git.kernel.org/stable/c/546c1796ad1ed0d87dab3c4b5156d75819be2316","https://git.kernel.org/stable/c/c55fc098fd9d2dca475b82d00ffbcaf97879d77e","https://git.kernel.org/stable/c/e134f3aba98e6c801a693f540912c2d493718ddf","https://git.kernel.org/stable/c/372636debe852913529b1716f44addd94fff2d28","https://git.kernel.org/stable/c/8f4f68e788c3a7a696546291258bfa5fdb215523"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/52xxx/CVE-2023-52813.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-52813","state":"PUBLISHED","datePublished":"2024-05-21T15:31:21.604Z","dateUpdated":"2026-05-11T19:33:36.420Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T15:19:24.248Z"},"containers":{"cna":{"title":"crypto: pcrypt - Fix hungtask for PADATA_RESET","descriptions":[{"lang":"en","value":"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 > /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->completion) 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->flags 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->completion), 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->flags |= PADATA_RESET;\n    err = -EBUSY                     |\n    if (pinst->flags & 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 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