CVE-2022-48933

Summary

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

netfilter: nf_tables: fix memory leak during stateful obj update

stateful objects can be updated from the control plane. The transaction logic allocates a temporary object for this purpose.

The ->init function was called for this object, so plain kfree() leaks resources. We must call ->destroy function of the object.

nft_obj_destroy does this, but it also decrements the module refcount, but the update path doesn't increment it.

To avoid special-casing the update object release, do module_get for the update case too and release it via nft_obj_destroy().

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd62d0ba97b5803183e70cfded7f7b9da76893bf5 < 53026346a94c43f35c32b18804041bc483271d87affected
LinuxLinuxd62d0ba97b5803183e70cfded7f7b9da76893bf5 < 7e9880e81d3fd6a43c202f205717485290432826affected
LinuxLinuxd62d0ba97b5803183e70cfded7f7b9da76893bf5 < e96e204ee6fa46702f6c94c3c69a09e69e0eac52affected
LinuxLinuxd62d0ba97b5803183e70cfded7f7b9da76893bf5 < 34bb90e407e3288f610558beaae54ecaa32b11c4affected
LinuxLinuxd62d0ba97b5803183e70cfded7f7b9da76893bf5 < dad3bdeef45f81a6e90204bcc85360bb76eccec7affected
LinuxLinux5.4affected
LinuxLinux0 < 5.4unaffected
LinuxLinux5.4.182 <= 5.4.*unaffected
LinuxLinux5.10.103 <= 5.10.*unaffected
LinuxLinux5.15.26 <= 5.15.*unaffected
LinuxLinux5.16.12 <= 5.16.*unaffected
LinuxLinux5.17 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References