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CVE-2021-46905

net: hso: fix NULL-deref on disconnect regression

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.19.189, 5.4.115, 5.10.33, 5.11.17
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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().

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 4.19.187 · fixed in 4.19.189; From 5.4.112 · fixed in 5.4.115; From 5.10.30 · fixed in 5.10.33; From 5.11.14 · fixed in 5.11.17

  • Linux Linux

    5.12

References 9

git.kernel.org