Buffer overflow in Linux
CVE-2021-47132
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.
Vulnerability class: Buffer Overflow
EPSS: 0.002 (11.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Linux — versions 5.12, 5.12.10, 0
- Linux Linux_kernel — versions 5.13
Weakness classification (CWE)
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2021-47132?
- CVE-2021-47132 is a high-severity vulnerability in Linux, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2024-03-15.
- How severe is CVE-2021-47132?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-47132 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.