CVE-2021-3490
7.8 HIGHThe eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could b...
Published: 2021-06-04 · Last updated: 2026-06-17
Severity and scoring
- CVSS
- 7.8 HIGH
- Vector
- CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- CWE
- CWE-125, CWE-20, CWE-787
Affected products
| Vendor | Product |
|---|---|
| canonical | linux_kernel, ubuntu_linux |
| linux | linux_kernel, ubuntu_linux |
Description
The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could be turned into out of bounds reads and writes in the Linux kernel and therefore, arbitrary code execution. This issue was fixed via commit 049c4e13714e ("bpf: Fix alu32 const subreg bound tracking on bitwise operations") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. The AND/OR issues were introduced by commit 3f50f132d840 ("bpf: Verifier, do explicit ALU32 bounds tracking") (5.7-rc1) and the XOR variant was introduced by 2921c90d4718 ("bpf:Fix a verifier failure with xor") ( 5.10-rc1).
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2021-3490
- [Exploit reference]http://packetstormsecurity.com/files/164015/Linux-eBPF-ALU32-32-bit-Invalid-Bounds-Tracking-Local-Privilege-Escalation.html
- [Patch]https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=049c4e13714ecbca567b4d5f6d563f05d431c80e
- [Other]https://security.netapp.com/advisory/ntap-20210716-0004/
- [Other]https://ubuntu.com/security/notices/USN-4949-1
- [Other]https://ubuntu.com/security/notices/USN-4950-1
- [Patch]https://www.openwall.com/lists/oss-security/2021/05/11/11
- [Other]https://www.zerodayinitiative.com/advisories/ZDI-21-606/
- [Exploit reference]http://packetstormsecurity.com/files/164015/Linux-eBPF-ALU32-32-bit-Invalid-Bounds-Tracking-Local-Privilege-Escalation.html
- [Patch]https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=049c4e13714ecbca567b4d5f6d563f05d431c80e
- [Other]https://security.netapp.com/advisory/ntap-20210716-0004/
- [Other]https://ubuntu.com/security/notices/USN-4949-1
- [Other]https://ubuntu.com/security/notices/USN-4950-1
- [Patch]https://www.openwall.com/lists/oss-security/2021/05/11/11
- [Other]https://www.zerodayinitiative.com/advisories/ZDI-21-606/
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