{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-80899 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-80899 is a vulnerability in Linux, published on 4 Sep 2026."},"fix_prompt":"Check this codebase for CVE-2026-80899 and fix it if it is affected.\n\nWhat it is: CVE-2026-80899 is a vulnerability in Linux, published on 4 Sep 2026. \nExploitation: There is no known exploitation of CVE-2026-80899 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-2026-80899/ (Markdown: https://insights.sbomify.com/CVE-2026-80899/index.md)","id":"CVE-2026-80899","markdown":"https://insights.sbomify.com/CVE-2026-80899/index.md","name":"CVE-2026-80899","record":{"aliases":["AZL-99582","BELL-CVE-2026-80899","DEBIAN-CVE-2026-80899","GHSA-gh58-fmwq-66r3","UBUNTU-CVE-2026-80899"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["other"],"network_reachable":"unknown","non_default_config":true,"product_category":"Linux kernel","requires_auth":"unknown","summary":"Removal of the deprecated EROFS fscache backend in the Linux kernel to eliminate implementation issues and dependencies.","user_interaction":"unknown","vuln_class":"other"},"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\nerofs: remove fscache backend entirely\n\nEROFS over fscache was introduced to provide image lazy pulling\nfunctionality. After the feature landed, the fscache subsystem made\nnetfs a new hard dependency, which is unexpected for a local filesystem\nand has an kernel-defined caching hierarchy which could be inflexible\ncompared to the fanotify pre-content hooks. Therefore, this feature has\nbeen deprecated for almost two years.\n\nAs EROFS file-backed mounts and fanotify pre-content hooks both upstream\nfor a while and already providing equivalent functionality (erofs-utils\nhas supported fanotify pre-content hooks), let's remove the fscache\nbackend now.\n\nThe main application of this feature is Nydus [1], and they plan to move\nto use fanotify pre-content hooks in the near future too.\n\nI hope this patch can be merged into Linux 7.2, which is also motivated\nby newly found implementation issues [2][3] that are not worth\ninvestigating given the deprecation and limited development resources.\nThe associated fscache/cachefiles cleanup patch will follow separately\nthrough the vfs tree (netfs) later: it seems fine since the codebase is\nisolated by CONFIG_CACHEFILES_ONDEMAND.\n\n[1] https://github.com/dragonflyoss/nydus/blob/v2.1.0/docs/nydus-fscache.md\n[2] https://github.com/dragonflyoss/nydus/pull/1824\n[3] https://lore.kernel.org/r/20260619135800.1594811-1-michael.bommarito@gmail.com","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":"erofs: remove fscache backend entirely","id":"CVE-2026-80899","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"other","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"ASoC: SDCA: Make UMP message size check more robust","id":"CVE-2026-80900"},"packages":[],"prev":{"headline":"netfs: clear PG_private_2 on copy-to-cache append failure","id":"CVE-2026-80898"},"products":["Linux"],"published":"2026-09-04","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":"2026-09-07","vendors":["Linux"]},"summary":"Removal of the deprecated EROFS fscache backend in the Linux kernel to eliminate implementation issues and dependencies.","url":"https://insights.sbomify.com/CVE-2026-80899/"}