{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-90110 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-90110 is a critical vulnerability in Linux, published on 17 Sep 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-2026-90110 and fix it if it is affected.\n\nWhat it is: CVE-2026-90110 is a critical vulnerability in Linux, published on 17 Sep 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-2026-90110 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-2026-90110/ (Markdown: https://insights.sbomify.com/CVE-2026-90110/index.md)","id":"CVE-2026-90110","markdown":"https://insights.sbomify.com/CVE-2026-90110/index.md","name":"CVE-2026-90110","record":{"aliases":["AZL-103026","BELL-CVE-2026-90110","DEBIAN-CVE-2026-90110","GHSA-cf89-f375-p3pc","UBUNTU-CVE-2026-90110"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel","requires_auth":"none","summary":"Off-path attackers can bypass ICMP rate limits and infer open UDP ports by predicting Linux kernel inetpeer tree topology.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":9.4,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\ninetpeer: randomize RB-tree node comparison using SipHash\n\nThe inetpeer rate limiting system stores peer entries in a Red-Black tree\nkeyed deterministically on the remote IP address. Because tree lookups walk\nthe RB-tree using standard lexicographical comparisons (inetpeer_addr_cmp),\nan off-path adversary can predict the exact topology of the tree and the\nsequence of nodes traversed during lookups (the gc_stack candidate list).\n\nBy combining deterministic tree traversal with aggressive garbage collection\n(triggered when tree size exceeds inet_peer_threshold), an attacker can\nselectively force the eviction of targeted inet_peer nodes. When an evicted\nnode is subsequently re-created upon receiving a new packet, its rate-limiting\ntoken bucket (rate_tokens, rate_last) is reset to full capacity. This creates\na side-channel primitive allowing off-path attackers to bypass IP-keyed ICMP\nrate limits and infer open UDP ports (similar to SAD DNS style attacks).\n\nMitigate this by randomizing the RB-tree node comparison logic using SipHash\nwith a secret key (inetpeer_hash_key) initialized via net_get_random_once().\nNodes are ordered in the tree by SipHash(addr, key) rather than raw IP\naddresses. Because the secret key is unknown to external entities, the tree\nlayout and lookup traversal paths are unpredictable to off-path adversaries,\nbreaking the deterministic eviction gadget.\n\nCache the computed 64-bit SipHash (hash) in struct inet_peer and compute the\ntarget hash (dhash) once at the beginning of inet_getpeer() to avoid recomputing\nSipHash at every step of the RB-tree walk.","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":"inetpeer: randomize RB-tree node comparison using SipHash","id":"CVE-2026-90110","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"information_disclosure","year":"2026"},"n_packages":0,"n_references":6,"next":{"headline":"ip6mr: do not clone dst in ip6mr_cache_report()","id":"CVE-2026-90111"},"packages":[],"prev":{"headline":"net: sched: fix 32-bit backlog wrap in gred, bfifo and plug enqueue","id":"CVE-2026-90109"},"products":["Linux"],"published":"2026-09-17","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-19","vendors":["Linux"]},"summary":"Off-path attackers can bypass ICMP rate limits and infer open UDP ports by predicting Linux kernel inetpeer tree topology.","url":"https://insights.sbomify.com/CVE-2026-90110/"}