Buffer overflow in Linux Kernel
CVE-2021-3489
The eBPF RINGBUF bpf_ringbuf_reserve() function in the Linux kernel did not check that the allocated size was smaller than the ringbuf size, allowing an attacker to perform out-of-bounds writes within the kernel and therefore, arbitrary co…
Vulnerability class: Buffer Overflow
EPSS: 0.005 (42.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Linux Kernel — versions trunk, linux-5.12.y, linux-5.11.y
- Linux Linux_kernel — versions 5.13
- Canonical Ubuntu_linux — versions 20.04, 20.10, 21.04
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@ubuntu.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- security@ubuntu.com (Patch, x_refsource_MISC, Vendor Advisory)
- security@ubuntu.com (VDB Entry, Third Party Advisory, x_refsource_MISC)
- security@ubuntu.com (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
- security@ubuntu.com (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
- security@ubuntu.com (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3489?
- CVE-2021-3489 is a high-severity vulnerability in Linux Kernel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2021-06-04.
- How severe is CVE-2021-3489?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-3489 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.