CVE-2022-48874

Summary

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

misc: fastrpc: Fix use-after-free and race in fastrpc_map_find

Currently, there is a race window between the point when the mutex is unlocked in fastrpc_map_lookup and the reference count increasing (fastrpc_map_get) in fastrpc_map_find, which can also lead to use-after-free.

So lets merge fastrpc_map_find into fastrpc_map_lookup which allows us to both protect the maps list by also taking the &fl->lock spinlock and the reference count, since the spinlock will be released only after. Add take_ref argument to make this suitable for all callers.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8f6c1d8c4f0cc316b0456788fff8373554d1d99d < a50c5c25b6e7d2824698c0e6385f882a18f4a498affected
LinuxLinux8f6c1d8c4f0cc316b0456788fff8373554d1d99d < 9446fa1683a7e3937d9970248ced427c1983a1c5affected
LinuxLinux5.18affected
LinuxLinux0 < 5.18unaffected
LinuxLinux6.1.8 <= 6.1.*unaffected
LinuxLinux6.2 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References