CVE-2021-47244
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.71%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.").
- CVSS 3.1
- 8.2 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- EPSS
- 0.71% probability · 52th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/07718be265680dcf496347d475ce1a5442f55ad7Patch
- https://git.kernel.org/stable/c/73eeba71dc9932970befa009e68272a3d5ec4a58Patch
- https://git.kernel.org/stable/c/76e02b8905d0691e89e104a882f3bba7dd0f6037Patch
- https://git.kernel.org/stable/c/07718be265680dcf496347d475ce1a5442f55ad7Patch
- https://git.kernel.org/stable/c/73eeba71dc9932970befa009e68272a3d5ec4a58Patch
- https://git.kernel.org/stable/c/76e02b8905d0691e89e104a882f3bba7dd0f6037Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.