CVE-2021-47356

Summary

In the Linux kernel, the following vulnerability has been resolved:

mISDN: fix possible use-after-free in HFC_cleanup()

This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free.

Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux87c5fa1bb42624254a2013cbbc3b170d6017f5d6 < 49331c07ef0f8fdfa42b30ba6a83a657b29d7fbeaffected
LinuxLinux87c5fa1bb42624254a2013cbbc3b170d6017f5d6 < 54ff3202928952a100c477248e65ac6db01258a7affected
LinuxLinux87c5fa1bb42624254a2013cbbc3b170d6017f5d6 < 7867ddc5f3de7f289aee63233afc0df4b62834c5affected
LinuxLinux87c5fa1bb42624254a2013cbbc3b170d6017f5d6 < 5f2818185da0fe82a932f0856633038b66faf124affected
LinuxLinux87c5fa1bb42624254a2013cbbc3b170d6017f5d6 < 3ecd228c636ee17c14662729737fa07242a93cb0affected
LinuxLinux87c5fa1bb42624254a2013cbbc3b170d6017f5d6 < b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802daffected
LinuxLinux87c5fa1bb42624254a2013cbbc3b170d6017f5d6 < 61370ff07e0acc657559a8fac02551dfeb9d3020affected
LinuxLinux87c5fa1bb42624254a2013cbbc3b170d6017f5d6 < ed7c3739d0a07e2ec3ccbffe7e93cea01c438cdaaffected
LinuxLinux87c5fa1bb42624254a2013cbbc3b170d6017f5d6 < 009fc857c5f6fda81f2f7dd851b2d54193a8e733affected
LinuxLinux2.6.29affected
LinuxLinux0 < 2.6.29unaffected
LinuxLinux4.4.276 <= 4.4.*unaffected
LinuxLinux4.9.276 <= 4.9.*unaffected
LinuxLinux4.14.240 <= 4.14.*unaffected
LinuxLinux4.19.198 <= 4.19.*unaffected
LinuxLinux5.4.133 <= 5.4.*unaffected
LinuxLinux5.10.51 <= 5.10.*unaffected
LinuxLinux5.12.18 <= 5.12.*unaffected
LinuxLinux5.13.3 <= 5.13.*unaffected
LinuxLinux5.14 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References