CVE-2021-47355

Summary

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

atm: nicstar: Fix possible use-after-free in nicstar_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
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 99779c9d9ffc7775da6f7fd8a7c93ac61657bed5affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4e2a0848ea2cab0716d46f85a8ccd5fa9a493e51affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c471569632654e57c83512e0fc1ba0dbb4544ad6affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a7a7b2848312cc4c3a42b6e42a8ab2e441857abaaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < bdf5334250c69fabf555b7322c75249ea7d5f148affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a7f7c42e31157d1f0871d6a8e1a0b73a6b4ea785affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2f958b6f6ba0854b39be748d21dfe71e0fe6580faffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5b991df8881088448cb223e769e37cab8dd40706affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 34e7434ba4e97f4b85c1423a59b2922ba7dff2eaaffected
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

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References