{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-63983 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-63983 is a denial of service vulnerability in Linux, published on 19 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-63983 and fix it if it is affected.\n\nWhat it is: CVE-2026-63983 is a denial of service vulnerability in Linux, published on 19 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-63983 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-2026-63983/ (Markdown: https://insights.sbomify.com/CVE-2026-63983/index.md)","id":"CVE-2026-63983","markdown":"https://insights.sbomify.com/CVE-2026-63983/index.md","name":"CVE-2026-63983","record":{"aliases":["AZL-92772","BELL-CVE-2026-63983","DEBIAN-CVE-2026-63983","GHSA-rj36-qxvm-r8rm","ROOT-OS-DEBIAN-11-CVE-2026-63983","ROOT-OS-DEBIAN-12-CVE-2026-63983","ROOT-OS-UBUNTU-2204-CVE-2026-63983","UBUNTU-CVE-2026-63983"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Linux kernel","requires_auth":"none","summary":"A remote attacker can cause a denial of service by triggering infinite packet duplication in the Linux kernel netem scheduler when configured with duplication enabled.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix packet loop on netem when duplicate is on\n\nWhen netem duplicates a packet it re-enqueues the copy at the root qdisc.\nIf another netem sits in the tree the copy can be duplicated\nagain, recursing until the stack or memory is exhausted.\n\nThe original duplication guard temporarily zeroed q-\u003eduplicate around\nthe re-enqueue, but that does not cover all cases because it is\nper-qdisc state shared across all concurrent enqueue paths\nand is not safe without additional locking.\n\nUse the skb tc_depth field introduced in an earlier patch:\n - increment it on the duplicate before re-enqueue\n - skip duplication for any skb whose tc_depth is already non-zero.\n\nThis marks the packet itself rather than mutating qdisc state,\ntherefore it is safe regardless of tree topology or concurrency.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"net/sched: fix packet loop on netem when duplicate is on","id":"CVE-2026-63983","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()","id":"CVE-2026-63984"},"packages":[],"prev":{"headline":"net/sched: Fix ethx:ingress -\u003e ethy:egress -\u003e ethx:ingress mirred loop","id":"CVE-2026-63982"},"products":["Linux"],"published":"2026-07-19","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-15","vendors":["Linux"]},"summary":"A remote attacker can cause a denial of service by triggering infinite packet duplication in the Linux kernel netem scheduler when configured with duplication enabled.","url":"https://insights.sbomify.com/CVE-2026-63983/"}