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
Link | Resource |
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https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=4b81ccebaeee885ab1aa1438133f2991e3a2b6ea | Patch Vendor Advisory |
https://security.netapp.com/advisory/ntap-20210716-0004/ | Third Party Advisory |
https://ubuntu.com/security/notices/USN-4949-1 | Third Party Advisory |
https://ubuntu.com/security/notices/USN-4950-1 | Third Party Advisory |
https://www.openwall.com/lists/oss-security/2021/05/11/10 | Mailing List Third Party Advisory |
https://www.zerodayinitiative.com/advisories/ZDI-21-590/ | Third Party Advisory VDB Entry |
Configurations
Configuration 1 (hide)
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Configuration 2 (hide)
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History
No history.
Information
Published : 2021-06-04 02:15
Updated : 2024-02-28 18:28
NVD link : CVE-2021-3489
Mitre link : CVE-2021-3489
CVE.ORG link : CVE-2021-3489
JSON object : View
Products Affected
linux
- linux_kernel
canonical
- ubuntu_linux