{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-64542 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-64542 is a 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-2026-64542 and fix it if it is affected.\n\nWhat it is: CVE-2026-64542 is a 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-2026-64542 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-2026-64542/ (Markdown: https://insights.sbomify.com/CVE-2026-64542/index.md)","id":"CVE-2026-64542","markdown":"https://insights.sbomify.com/CVE-2026-64542/index.md","name":"CVE-2026-64542","record":{"aliases":["AZL-94044","BELL-CVE-2026-64542","DEBIAN-CVE-2026-64542","GHSA-f33q-wfg9-j2hv","UBUNTU-CVE-2026-64542"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"none","summary":"An unprivileged user can cause a kernel crash via a race condition in IPv6 neighbor discovery, leading to denial of service.","user_interaction":"not_required","vuln_class":"null_dereference"},"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\nipv6: ndisc: fix NULL deref in accept_untracked_na()\n\naccept_untracked_na() re-fetches the inet6_dev with __in6_dev_get(dev)\nand dereferences idev-\u003ecnf.accept_untracked_na without a NULL check,\neven though its only caller ndisc_recv_na() already fetched and\nNULL-checked idev for the same device.\n\nBoth reads of dev-\u003eip6_ptr run in the same RCU read-side critical\nsection, but a concurrent addrconf_ifdown() can clear dev-\u003eip6_ptr\nbetween them: lowering the MTU below IPV6_MIN_MTU calls addrconf_ifdown()\nwithout the synchronize_net() that orders the unregister path, so the\nre-fetch returns NULL and oopses:\n\n BUG: KASAN: null-ptr-deref in ndisc_recv_na (net/ipv6/ndisc.c:974)\n Read of size 4 at addr 0000000000000364\n Call Trace:\n  \u003cIRQ\u003e\n  ndisc_recv_na (net/ipv6/ndisc.c:974)\n  icmpv6_rcv (net/ipv6/icmp.c:1193)\n  ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:479)\n  ip6_input_finish (net/ipv6/ip6_input.c:534)\n  ip6_input (net/ipv6/ip6_input.c:545)\n  ip6_mc_input (net/ipv6/ip6_input.c:635)\n  ipv6_rcv (net/ipv6/ip6_input.c:351)\n  \u003c/IRQ\u003e\n\nIt is reachable by an unprivileged user via a network namespace.\n\nPass the caller's already validated idev instead of re-fetching it; the\nidev stays alive for the whole RCU critical section, so it is safe even\nafter dev-\u003eip6_ptr has been cleared.","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":"ipv6: ndisc: fix NULL deref in accept_untracked_na()","id":"CVE-2026-64542","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":0,"n_references":6,"next":{"headline":"tipc: fix use-after-free of the discoverer in tipc_disc_rcv()","id":"CVE-2026-64543"},"packages":[],"prev":{"headline":"net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket","id":"CVE-2026-64541"},"products":["Linux"],"published":"2026-07-27","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":"2026-08-19","vendors":["Linux"]},"summary":"An unprivileged user can cause a kernel crash via a race condition in IPv6 neighbor discovery, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2026-64542/"}