CVE-2023-34319

Summary

The fix for XSA-423 added logic to Linux'es netback driver to deal with a frontend splitting a packet in a way such that not all of the headers would come in one piece. Unfortunately the logic introduced there didn't account for the extreme case of the entire packet being split into as many pieces as permitted by the protocol, yet still being smaller than the area that's specially dealt with to keep all (possible) headers together. Such an unusual packet would therefore trigger a buffer overrun in the driver.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxconsult Xen advisory XSA-432unknown

Weaknesses

Workarounds

Using another PV network backend (e.g. the qemu based "qnic" backend) will mitigate the problem.

Using a dedicated network driver domain per guest will mitigate the problem.

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References