High severity7.8NVD Advisory· Published Jun 4, 2021· Updated Jun 17, 2026
CVE-2021-3489
CVE-2021-3489
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).
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
40- Range: >=5.8-rc1 <5.13-rc4
- osv-coords38 versionspkg:rpm/almalinux/kernel-tools-libs-develpkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-debug&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-preempt&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-source-azure&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/kernel-syms-azure&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2015.3pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP3pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP3pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP3pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP3pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP3pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3pkg:rpm/suse/kernel-livepatch-SLE15-SP3_Update_0&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP3pkg:rpm/suse/kernel-livepatch-SLE15-SP3_Update_1&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP3pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3pkg:rpm/suse/kernel-preempt&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/kernel-preempt&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3pkg:rpm/suse/kernel-preempt&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP3pkg:rpm/suse/kernel-source-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP3pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3pkg:rpm/suse/kernel-syms-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP3pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3
< 4.18.0-348.el8+ 37 more
- (no CPE)range: < 4.18.0-348.el8
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-38.3.1
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2.18.2.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.1
- (no CPE)range: < 5.3.18-59.5.1
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-38.3.1
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.14.6-1.4
- (no CPE)range: < 5.3.18-38.3.1
- (no CPE)range: < 5.3.18-59.5.1
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-38.3.1
- (no CPE)range: < 5.3.18-59.5.2.18.2.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 2-3.1
- (no CPE)range: < 1-7.5.1
- (no CPE)range: < 5.3.18-59.5.1
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-38.3.1
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-38.3.1
- (no CPE)range: < 5.3.18-59.5.1
- (no CPE)range: < 5.3.18-59.5.2
Patches
Vulnerability mechanics
References
6- git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/nvdPatchVendor Advisory
- security.netapp.com/advisory/ntap-20210716-0004/nvdThird Party Advisory
- ubuntu.com/security/notices/USN-4949-1nvdThird Party Advisory
- ubuntu.com/security/notices/USN-4950-1nvdThird Party Advisory
- www.openwall.com/lists/oss-security/2021/05/11/10nvdMailing ListThird Party Advisory
- www.zerodayinitiative.com/advisories/ZDI-21-590/nvdThird Party AdvisoryVDB Entry
News mentions
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