CVE - CVE-2021-3489

CVE-ID
CVE-2021-3489	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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 code execution. This issue was fixed via commit 4b81ccebaeee ("bpf, ringbuf: Deny reserve of buffers larger than ringbuf") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced via 457f44363a88 ("bpf: Implement BPF ring buffer and verifier support for it") (v5.8-rc1).
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://security.netapp.com/advisory/ntap-20210716-0004/ MISC:https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=4b81ccebaeee885ab1aa1438133f2991e3a2b6ea URL:https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=4b81ccebaeee885ab1aa1438133f2991e3a2b6ea MISC:https://www.zerodayinitiative.com/advisories/ZDI-21-590/ URL:https://www.zerodayinitiative.com/advisories/ZDI-21-590/ MLIST:[oss-security] CVE-2021-3489 - Linux kernel eBPF RINGBUF map oversized allocation URL:https://www.openwall.com/lists/oss-security/2021/05/11/10 UBUNTU:https://ubuntu.com/security/notices/USN-4949-1 URL:https://ubuntu.com/security/notices/USN-4949-1 UBUNTU:https://ubuntu.com/security/notices/USN-4950-1 URL:https://ubuntu.com/security/notices/USN-4950-1
Assigning CNA
Canonical Ltd.
Date Record Created
20210409	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20210409)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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