CVE - CVE-2021-3490

CVE-ID
CVE-2021-3490	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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).
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:http://packetstormsecurity.com/files/164015/Linux-eBPF-ALU32-32-bit-Invalid-Bounds-Tracking-Local-Privilege-Escalation.html MISC:https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=049c4e13714ecbca567b4d5f6d563f05d431c80e URL:https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=049c4e13714ecbca567b4d5f6d563f05d431c80e MISC:https://www.zerodayinitiative.com/advisories/ZDI-21-606/ URL:https://www.zerodayinitiative.com/advisories/ZDI-21-606/ MLIST:[oss-security] CVE-2021-3490 - Linux kernel eBPF bitwise ops ALU32 bounds tracking URL:https://www.openwall.com/lists/oss-security/2021/05/11/11 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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