{"answers":{"affected":"It affects 2 products.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-3490 exists.","fix":"Apply the vendor's patch.","what":"CVE-2021-3490 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 4 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-3490 and fix it if it is affected.\n\nWhat it is: CVE-2021-3490 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 4 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-3490 exists.\n\nAffected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-3490/ (Markdown: https://insights.sbomify.com/CVE-2021-3490/index.md)","id":"CVE-2021-3490","markdown":"https://insights.sbomify.com/CVE-2021-3490/index.md","name":"CVE-2021-3490","record":{"aliases":["A-190876666","DEBIAN-CVE-2021-3490","GHSA-9wfm-q59x-qc3x","PUB-A-190876666","UBUNTU-CVE-2021-3490"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"Improper bounds tracking in eBPF ALU32 bitwise operations allows out-of-bounds reads and writes, leading to arbitrary code execution in the Linux kernel.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"canonical","cpe":[{"product":"ubuntu_linux","vendor":"canonical"},{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-125","name":"Out-of-bounds Read"},{"id":"CWE-787","name":"Out-of-bounds Write"},{"id":"CWE-20","name":"Improper Input Validation"}],"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).","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2021-05-11","github_poc":5,"max_poc_stars":317,"metasploit":1,"nuclei":0,"refs":[{"date":"2021-06-24T18:50:17Z","kind":"github_poc","ref":"https://github.com/chompie1337/Linux_LPE_eBPF_CVE-2021-3490","stars":317,"title":null},{"date":"2023-04-06T03:21:11Z","kind":"github_poc","ref":"https://github.com/pivik271/CVE-2021-3490","stars":2,"title":null},{"date":"2021-05-11","kind":"metasploit","ref":"exploit/linux/local/cve_2021_3490_ebpf_alu32_bounds_check_lpe","stars":null,"title":"Linux eBPF ALU32 32-bit Invalid Bounds Tracking LPE"},{"date":"2026-03-03T17:10:57Z","kind":"github_poc","ref":"https://github.com/sandesh9978/cve-2021-3490-ebpf-analysis","stars":0,"title":"Research implementation demonstrating interaction with Linux eBPF subsystem related to CVE-2021-3490. Includes BPF map creation, syscall wrappers, namespace setup, and verifier analysis. For educational and security research purposes only."},{"date":"2026-03-04T07:51:31Z","kind":"github_poc","ref":"https://github.com/prabeershakya/CVE-2021-3490-POC","stars":0,"title":null},{"date":"2026-07-21T18:55:06Z","kind":"github_poc","ref":"https://github.com/WhatsWrongAndWhy/CVE-2021-3490","stars":0,"title":null}],"tier":"weaponised"},"has_fix":true,"headline":"Linux kernel eBPF bitwise ops ALU32 bounds tracking","id":"CVE-2021-3490","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"canonical:ubuntu_linux","products":["canonical:ubuntu_linux","linux:linux_kernel"],"type":"memory_corruption","year":"2021"},"n_packages":0,"n_references":7,"next":{"headline":"Linux kernel io_uring PROVIDE_BUFFERS MAX_RW_COUNT bypass","id":"CVE-2021-3491"},"packages":[],"prev":{"headline":"Linux kernel eBPF RINGBUF map oversized allocation","id":"CVE-2021-3489"},"products":["Linux kernel"],"published":"2021-06-04","related":[{"cvss_score":9.8,"headline":"SaltStack Salt Authentication Bypass","id":"CVE-2020-11651","kev_date_added":"2021-11-03","published":"2020-04-30"},{"cvss_score":9.8,"headline":"OpenSMTPD Remote Code Execution","id":"CVE-2020-7247","kev_date_added":"2022-03-25","published":"2020-01-29"},{"cvss_score":9.8,"headline":"Exim Out-of-bounds Write","id":"CVE-2019-16928","kev_date_added":"2022-03-03","published":"2019-09-27"},{"cvss_score":9.8,"headline":"Exim Buffer Overflow","id":"CVE-2018-6789","kev_date_added":"2021-11-03","published":"2018-02-08"},{"cvss_score":9.8,"headline":"Oracle Java SE and Java SE Embedded Remote Code Execution","id":"CVE-2015-2590","kev_date_added":"2022-03-03","published":"2015-07-16"},{"cvss_score":9.8,"headline":"Oracle JRE Remote Code Execution","id":"CVE-2013-0422","kev_date_added":"2022-05-25","published":"2013-01-10"},{"cvss_score":9.8,"headline":"Oracle Java SE Runtime Environment (JRE) Arbitrary Code Execution","id":"CVE-2011-3544","kev_date_added":"2022-03-03","published":"2011-10-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"attribution","licence":"BSD-3-Clause","name":"Metasploit"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-09-16","vendors":["Linux"]},"summary":"Improper bounds tracking in eBPF ALU32 bitwise operations allows out-of-bounds reads and writes, leading to arbitrary code execution in the Linux kernel.","url":"https://insights.sbomify.com/CVE-2021-3490/"}