CVE-2021-47244

Summary

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

mptcp: Fix out of bounds when parsing TCP options

The TCP option parser in mptcp (mptcp_get_options) could read one byte out of bounds. When the length is 1, the execution flow gets into the loop, reads one byte of the opcode, and if the opcode is neither TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds the length of 1.

This fix is inspired by commit 9609dad263f8 ("ipv4: tcp_input: fix stack out of bounds when parsing TCP options.").

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxcec37a6e41aae7bf3df9a3da783380a4d9325fd8 < 73eeba71dc9932970befa009e68272a3d5ec4a58affected
LinuxLinuxcec37a6e41aae7bf3df9a3da783380a4d9325fd8 < 76e02b8905d0691e89e104a882f3bba7dd0f6037affected
LinuxLinuxcec37a6e41aae7bf3df9a3da783380a4d9325fd8 < 07718be265680dcf496347d475ce1a5442f55ad7affected
LinuxLinux5.6affected
LinuxLinux0 < 5.6unaffected
LinuxLinux5.10.46 <= 5.10.*unaffected
LinuxLinux5.12.13 <= 5.12.*unaffected
LinuxLinux5.13 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References