CVE-2021-47357

Summary

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

atm: iphase: fix possible use-after-free in ia_module_exit()

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
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9e161687855175334ca93c6c3ccb221731194479affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a832ee2f2145f57443b2d565f8cb5490e8339f42affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < bcdd2be48edd8c6867fb44112cb8d18086beae29affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 89ce0b0747f319eb70f85bc820dcc43cebbd5417affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c9172498d4d62c9b64e5fb37c1ee0343e65fe51baffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e759ff76ebbbfcdcf83b6634c54dc47828573d8baffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b58d246a058ae88484758cd4ab27b3180fd5ecf8affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d1fb12412874c94ad037e11d0ecdd1140a439297affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1c72e6ab66b9598cac741ed397438a52065a8f1faffected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
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

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References