CVE-2021-46905

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().

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxa462067d7c8e6953a733bf5ade8db947b1bb5449 < 5871761c5f0f20d6e98bf3b6bd7486d857589554affected
LinuxLinux145c89c441d27696961752bf51b323f347601bee < 0c71d4c89559f72cec2592d078681a843bce570eaffected
LinuxLinuxcaf5ac93b3b5d5fac032fc11fbea680e115421b4 < 24b699bea7553fc0b98dad9d864befb6005ac7f1affected
LinuxLinux92028d7a31e55d53e41cff679156b9432cffcb36 < 5c17cfe155d21954b4c7e2a78fa771cebcd86725affected
LinuxLinux4a2933c88399c0ebc738db39bbce3ae89786d723 < d7fad2ce15bdbbd0fec3ebe999fd7cab2267f53eaffected
LinuxLinuxdc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac < 90642ee9eb581a13569b1c0bd57e85d962215273affected
LinuxLinux388d05f70f1ee0cac4a2068fd295072f1a44152a < 0f000005da31f6947f843ce6b3e3a960540c6e00affected
LinuxLinux8a12f8836145ffe37e9c8733dce18c22fb668b66 < 41c44e1f3112d7265dae522c026399b2a42d19efaffected
LinuxLinux8a12f8836145ffe37e9c8733dce18c22fb668b66 < 2ad5692db72874f02b9ad551d26345437ea4f7f3affected
LinuxLinux4.19.187 < 4.19.189affected
LinuxLinux5.4.112 < 5.4.115affected
LinuxLinux5.10.30 < 5.10.33affected
LinuxLinux5.11.14 < 5.11.17affected
LinuxLinux5.12affected
LinuxLinux0 < 5.12unaffected
LinuxLinux4.19.189 <= 4.19.*unaffected
LinuxLinux5.4.115 <= 5.4.*unaffected
LinuxLinux5.10.33 <= 5.10.*unaffected
LinuxLinux5.11.17 <= 5.11.*unaffected
LinuxLinux5.12.1 <= 5.12.*unaffected
LinuxLinux5.13 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References