CVE-2021-46998

Summary

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

ethernet:enic: Fix a use after free bug in enic_hard_start_xmit

In enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside enic_queue_wq_skb, if some error happens, the skb will be freed by dev_kfree_skb(skb). But the freed skb is still used in skb_tx_timestamp(skb).

My patch makes enic_queue_wq_skb() return error and goto spin_unlock() incase of error. The solution is provided by Govind. See https://lkml.org/lkml/2021/4/30/961.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxfb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 < 25a87b1f566b5eb2af2857a928f0e2310d900976affected
LinuxLinuxfb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 < f7f6f07774091a6ddd98500b85386c3c6afb30d3affected
LinuxLinuxfb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 < 7afdd6aba95c8a526038e7abe283eeac3e4320f1affected
LinuxLinuxfb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 < 6892396ebf04ea2c021d80e10f4075e014cd7cc3affected
LinuxLinuxfb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 < d90529392aaf498dafa95d212295d64b2cea4e24affected
LinuxLinuxfb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 < 643001b47adc844ae33510c4bb93c236667008a3affected
LinuxLinux4.16affected
LinuxLinux0 < 4.16unaffected
LinuxLinux4.19.191 <= 4.19.*unaffected
LinuxLinux5.4.120 <= 5.4.*unaffected
LinuxLinux5.10.38 <= 5.10.*unaffected
LinuxLinux5.11.22 <= 5.11.*unaffected
LinuxLinux5.12.5 <= 5.12.*unaffected
LinuxLinux5.13 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References