CVE-2021-47081

Summary

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

habanalabs/gaudi: Fix a potential use after free in gaudi_memset_device_memory

Our code analyzer reported a uaf.

In gaudi_memset_device_memory, cb is get via hl_cb_kernel_create() with 2 refcount. If hl_cs_allocate_job() failed, the execution runs into release_cb branch. One ref of cb is dropped by hl_cb_put(cb) and could be freed if other thread also drops one ref. Then cb is used by cb->id later, which is a potential uaf.

My patch add a variable 'id' to accept the value of cb->id before the hl_cb_put(cb) is called, to avoid the potential uaf.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux423815bf02e257091d5337be5c63b57fc29e4254 < b49f5af30b0e4064fbd91e83823a4bfcb2c7a3e7affected
LinuxLinux423815bf02e257091d5337be5c63b57fc29e4254 < 115726c5d312b462c9d9931ea42becdfa838a076affected
LinuxLinux5.12affected
LinuxLinux0 < 5.12unaffected
LinuxLinux5.12.7 <= 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