Riskcovery

CVE-2021-47244

mptcp: Fix out of bounds when parsing TCP options

State
Published
Severity
8.2 High
Published
May 21, 2024
Updated
Aug 5, 2026
Reserved
Apr 10, 2024

Read the record on cve.org

Description

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.").

Scores

CVSSScoreVectorSource
3.18.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:HLinux
3.16.2 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCISA-ADP

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • cec37a6e41aae7bf3df9a3da783380a4d9325fd8 to before 73eeba71dc9932970befa009e68272a3d5ec4a58Affected
  • cec37a6e41aae7bf3df9a3da783380a4d9325fd8 to before 76e02b8905d0691e89e104a882f3bba7dd0f6037Affected
  • cec37a6e41aae7bf3df9a3da783380a4d9325fd8 to before 07718be265680dcf496347d475ce1a5442f55ad7Affected
LinuxLinux
  • 5.6Affected
  • before 5.6Not affected
  • 5.10.46 through 5.10.*Not affected
  • 5.12.13 through 5.12.*Not affected
  • 5.13 and laterNot affected

References

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