CVE-2021-46905

Advisory lineage Upstream: 0 Downstream: 10
Modified
Published: 25 Feb 2024, 14:03
Last modified:23 May 2026, 15:18

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

25 Feb 2024, 14:03
Published
Vulnerability first disclosed
23 May 2026, 15:18
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: net: hso: fix NULL-deref on disconnect regression Commit 8a12f8836145 ("net: hso: fix null-ptr-deref during tty device unregistration") fixed the racy minor allocation reported by syzbot, but introduced an unconditional NULL-pointer dereference on every disconnect instead. Specifically, the serial device table must no longer be accessed after the minor has been released by hso_serial_tty_unregister().

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%

Techniques & Countermeasures

  • CWE-476•NULL Pointer Dereference

    The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

  • linux•linux

    ≥ a462067d7c8e6953a733bf5ade8db947b1bb5449, < 5871761c5f0f20d6e98bf3b6bd7486d857589554 | ≥ 145c89c441d27696961752bf51b323f347601bee, < 0c71d4c89559f72cec2592d078681a843bce570e | ≥ caf5ac93b3b5d5fac032fc11fbea680e115421b4, < 24b699bea7553fc0b98dad9d864befb6005ac7f1 | ≥ 92028d7a31e55d53e41cff679156b9432cffcb36, < 5c17cfe155d21954b4c7e2a78fa771cebcd86725 | ≥ 4a2933c88399c0ebc738db39bbce3ae89786d723, < d7fad2ce15bdbbd0fec3ebe999fd7cab2267f53e | ≥ dc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac, < 90642ee9eb581a13569b1c0bd57e85d962215273 | ≥ 388d05f70f1ee0cac4a2068fd295072f1a44152a, < 0f000005da31f6947f843ce6b3e3a960540c6e00 | ≥ 8a12f8836145ffe37e9c8733dce18c22fb668b66, < 41c44e1f3112d7265dae522c026399b2a42d19ef | ≥ 8a12f8836145ffe37e9c8733dce18c22fb668b66, < 2ad5692db72874f02b9ad551d26345437ea4f7f3 | ≥ 4.19.187, < 4.19.189 | ≥ 5.4.112, < 5.4.115 | ≥ 5.10.30, < 5.10.33 | ≥ 5.11.14, < 5.11.17 | 5.12

  • linux•linux_kernel

    < 4.19.189 | ≥ 4.20.0, < 5.4.115 | ≥ 5.5.0, < 5.10.33 | ≥ 5.11.0, < 5.11.17 | 5.12 | 5.12:rc1 | 5.12:rc2 | 5.12:rc3 | 5.12:rc4 | 5.12:rc5 | 5.12:rc6 | 5.12:rc7

References (9)