CVE-2023-52813

Advisory lineage Upstream: 0 Downstream: 12
Analyzed
Published: 21 May 2024, 15:31
Last modified:11 May 2026, 19:33

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.01% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

21 May 2024, 15:31
Published
Vulnerability first disclosed
11 May 2026, 19:33
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: pcrypt - Fix hungtask for PADATA_RESET We found a hungtask bug in test_aead_vec_cfg as follows: INFO: task cryptomgr_test:391009 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Call trace: __switch_to+0x98/0xe0 __schedule+0x6c4/0xf40 schedule+0xd8/0x1b4 schedule_timeout+0x474/0x560 wait_for_common+0x368/0x4e0 wait_for_completion+0x20/0x30 wait_for_completion+0x20/0x30 test_aead_vec_cfg+0xab4/0xd50 test_aead+0x144/0x1f0 alg_test_aead+0xd8/0x1e0 alg_test+0x634/0x890 cryptomgr_test+0x40/0x70 kthread+0x1e0/0x220 ret_from_fork+0x10/0x18 Kernel panic - not syncing: hung_task: blocked tasks For padata_do_parallel, when the return err is 0 or -EBUSY, it will call wait_for_completion(&wait->completion) in test_aead_vec_cfg. In normal case, aead_request_complete() will be called in pcrypt_aead_serial and the return err is 0 for padata_do_parallel. But, when pinst->flags is PADATA_RESET, the return err is -EBUSY for padata_do_parallel, and it won't call aead_request_complete(). Therefore, test_aead_vec_cfg will hung at wait_for_completion(&wait->completion), which will cause hungtask. The problem comes as following: (padata_do_parallel) | rcu_read_lock_bh(); | err = -EINVAL; | (padata_replace) | pinst->flags |= PADATA_RESET; err = -EBUSY | if (pinst->flags & PADATA_RESET) | rcu_read_unlock_bh() | return err In order to resolve the problem, we replace the return err -EBUSY with -EAGAIN, which means parallel_data is changing, and the caller should call it again. v3: remove retry and just change the return err. v2: introduce padata_try_do_parallel() in pcrypt_aead_encrypt and pcrypt_aead_decrypt to solve the hungtask.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 1%

Affected Systems

  • linux•linux

    ≥ 16295bec6398a3eedc9377e1af6ff4c71b98c300, < fb2d3a50a8f29a3c66682bb426144f40e32ab818 | ≥ 16295bec6398a3eedc9377e1af6ff4c71b98c300, < 039fec48e062504f14845124a1a25eb199b2ddc0 | ≥ 16295bec6398a3eedc9377e1af6ff4c71b98c300, < c9c1334697301c10e6918d747ed38abfbc0c96e7 | ≥ 16295bec6398a3eedc9377e1af6ff4c71b98c300, < e97bf4ada7dddacd184c3e196bd063b0dc71b41d | ≥ 16295bec6398a3eedc9377e1af6ff4c71b98c300, < 546c1796ad1ed0d87dab3c4b5156d75819be2316 | ≥ 16295bec6398a3eedc9377e1af6ff4c71b98c300, < c55fc098fd9d2dca475b82d00ffbcaf97879d77e | ≥ 16295bec6398a3eedc9377e1af6ff4c71b98c300, < e134f3aba98e6c801a693f540912c2d493718ddf | ≥ 16295bec6398a3eedc9377e1af6ff4c71b98c300, < 372636debe852913529b1716f44addd94fff2d28 | ≥ 16295bec6398a3eedc9377e1af6ff4c71b98c300, < 8f4f68e788c3a7a696546291258bfa5fdb215523 | 2.6.34

  • linux•linux_kernel

    ≥ 2.6.34, < 4.14.331 | ≥ 4.15, < 4.19.300 | ≥ 4.20, < 5.4.262 | ≥ 5.5, < 5.10.202 | ≥ 5.11, < 5.15.140 | ≥ 5.16, < 6.1.64 | ≥ 6.2, < 6.5.13 | ≥ 6.6, < 6.6.3

References (9)