CVE-2023-3812

Summary

An out-of-bounds memory access flaw was found in the Linux kernel’s TUN/TAP device driver functionality in how a user generates a malicious (too big) networking packet when napi frags is enabled. This flaw allows a local user to crash or potentially escalate their privileges on the system.

Affected Software

VendorProductVersion RangeStatus
Red HatRed Hat Enterprise Linux 80:4.18.0-513.9.1.rt7.311.el8_9 < *unaffected
Red HatRed Hat Enterprise Linux 80:4.18.0-513.9.1.el8_9 < *unaffected
Red HatRed Hat Enterprise Linux 8.1 Update Services for SAP Solutions0:4.18.0-147.94.1.el8_1 < *unaffected
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Support0:4.18.0-193.133.1.el8_2 < *unaffected
Red HatRed Hat Enterprise Linux 8.2 Telecommunications Update Service0:4.18.0-193.133.1.rt13.184.el8_2 < *unaffected
Red HatRed Hat Enterprise Linux 8.2 Telecommunications Update Service0:4.18.0-193.133.1.el8_2 < *unaffected
Red HatRed Hat Enterprise Linux 8.2 Update Services for SAP Solutions0:4.18.0-193.133.1.el8_2 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support0:4.18.0-305.120.1.el8_4 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Telecommunications Update Service0:4.18.0-305.120.1.rt7.196.el8_4 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Telecommunications Update Service0:4.18.0-305.120.1.el8_4 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Update Services for SAP Solutions0:4.18.0-305.120.1.el8_4 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support0:4.18.0-372.87.1.el8_6 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Extended Update Support0:4.18.0-477.43.1.el8_8 < *unaffected
Red HatRed Hat Enterprise Linux 90:5.14.0-362.18.1.el9_3 < *unaffected
Red HatRed Hat Enterprise Linux 90:5.14.0-362.18.1.el9_3 < *unaffected
Red HatRed Hat Enterprise Linux 9.0 Extended Update Support0:5.14.0-70.80.1.el9_0 < *unaffected
Red HatRed Hat Enterprise Linux 9.0 Extended Update Support0:5.14.0-70.80.1.rt21.151.el9_0 < *unaffected
Red HatRed Hat Enterprise Linux 9.2 Extended Update Support0:5.14.0-284.40.1.el9_2 < *unaffected
Red HatRed Hat Enterprise Linux 9.2 Extended Update Support0:5.14.0-284.40.1.rt14.325.el9_2 < *unaffected
Red HatRed Hat Virtualization 4 for Red Hat Enterprise Linux 80:4.18.0-372.87.1.el8_6 < *unaffected

Weaknesses

  • CWE-787: Out-of-bounds Write

Workarounds

To mitigate this issue, prevent the tun module from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References