Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix sk_forward_memory corruption on retransmission MPTCP sk_forward_memory handling is a bit special, as such field is protected by the msk socket spin_lock, instead of the plain socket lock. Currently we have a code path updating such field without handling the relevant lock: __mptcp_retrans() -> __mptcp_clean_una_wakeup() Several helpers in __mptcp_clean_una_wakeup() will update sk_forward_alloc, possibly causing such field corruption, as reported by Matthieu. Address the issue providing and using a new variant of blamed function which explicitly acquires the msk spin lock.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.12, < 5.12.10 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/b5941f066b4ca331db225a976dae1d6ca8cf0ae3Patch
- https://git.kernel.org/stable/c/b9c78b1a95966a7bd2ddae05b73eafc0cda4fba3Patch
- https://git.kernel.org/stable/c/b5941f066b4ca331db225a976dae1d6ca8cf0ae3Patch
- https://git.kernel.org/stable/c/b9c78b1a95966a7bd2ddae05b73eafc0cda4fba3Patch
FAQ
What is CVE-2021-47132?
CVE-2021-47132 is a vulnerability with a CVSS score of 7.1 (HIGH). In the Linux kernel, the following vulnerability has been resolved: mptcp: fix sk_forward_memory corruption on retransmission MPTCP sk_forward_memory handling is a bit special, as such field is prot...
How severe is CVE-2021-47132?
CVE-2021-47132 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47132?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.