{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-64531 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-64531 is a high-severity vulnerability in Linux, published on 27 Jul 2026. 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-2026-64531 and fix it if it is affected.\n\nWhat it is: CVE-2026-64531 is a high-severity vulnerability in Linux, published on 27 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-64531 in the wild and no public exploit code.\n\nAffected product: 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-2026-64531/ (Markdown: https://insights.sbomify.com/CVE-2026-64531/index.md)","id":"CVE-2026-64531","markdown":"https://insights.sbomify.com/CVE-2026-64531/index.md","name":"CVE-2026-64531","record":{"aliases":["AZL-93965","BELL-CVE-2026-64531","DEBIAN-CVE-2026-64531","GHSA-4pwv-pmm4-fw4r","ROOT-OS-DEBIAN-12-CVE-2026-64531","UBUNTU-CVE-2026-64531","USN-8659-1","USN-8659-2","USN-8659-3","USN-8659-4"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"An integer overflow in Open vSwitch allows attackers to corrupt memory, potentially leading to code execution or system crashes.","user_interaction":"not_required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-190","name":"Integer Overflow or Wraparound"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: reject oversized nested action attrs\n\nOpen vSwitch stores generated flow actions as nlattrs, whose nla_len\nfield is u16. Commit a1e64addf3ff (\"net: openvswitch: remove\nmisbehaving actions length check\") allowed the total sw_flow_actions\nstream to grow beyond 64 KiB, which is valid, but also removed the last\nguard preventing a generated nested action attribute from exceeding\nU16_MAX.\n\nAn oversized generated container can thus be closed with a truncated\nnla_len. A later dump or teardown then walks a structurally different\nstream than the one that was validated. In particular, an oversized\nnested CLONE/CT action may cause subsequent bytes in the generated\nstream to be interpreted as independent actions.\n\nKeep the larger total-action-stream behavior, but make nested action\nclose reject generated containers that do not fit in nla_len, and return\nthe error through all callers. For recursive SAMPLE, CLONE, DEC_TTL, and\nCHECK_PKT_LEN builders, trim resource-owning action-list tails in reverse\nconstruction order before discarding failed wrappers, so resources copied\ninto the rejected tails are released before the wrappers are removed.\n\nMost failed outer wrappers are discarded by truncating actions_len after\nchild resources have been released. CHECK_PKT_LEN also trims its parent\nafter branch resources are gone. SET/TUNNEL close failures unwind their\nknown tun_dst ownership directly, and SET_TO_MASKED has no external\nownership and truncates on close failure.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-07-29","github_poc":4,"max_poc_stars":11,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-08-03T11:25:09Z","kind":"github_poc","ref":"https://github.com/HackSpeak/CVE-2026-64531","stars":11,"title":"CVE-2026-64531 (OVSwrap) PoC - Linux kernel Open vSwitch LPE; for patch validation and security research"},{"date":"2026-07-31T15:21:38Z","kind":"github_poc","ref":"https://github.com/mahfuzreham/OVSwrap-CVE-2026-64531-Mitigation-Tool","stars":3,"title":null},{"date":"2026-08-01T15:29:45Z","kind":"github_poc","ref":"https://github.com/0xredash/CVE-2026-64531","stars":2,"title":"CVE-2026-64531"},{"date":"2026-07-29T05:15:24Z","kind":"github_poc","ref":"https://github.com/suominen/ovswrap","stars":0,"title":"Tracking OVSwrap (CVE-2026-64531), the Open vSwitch datapath netlink overflow"}],"tier":"poc_unverified"},"has_fix":true,"headline":"net: openvswitch: reject oversized nested action attrs","id":"CVE-2026-64531","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"integer_overflow","year":"2026"},"n_packages":0,"n_references":7,"next":{"headline":"fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}","id":"CVE-2026-64532"},"packages":[],"prev":{"headline":"net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle","id":"CVE-2026-64530"},"products":["Linux"],"published":"2026-07-27","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-19","vendors":["Linux"]},"summary":"An integer overflow in Open vSwitch allows attackers to corrupt memory, potentially leading to code execution or system crashes.","url":"https://insights.sbomify.com/CVE-2026-64531/"}