{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40210 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-40210 is a high-severity denial of service vulnerability in Linux, published on 21 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-40210 and fix it if it is affected.\n\nWhat it is: CVE-2025-40210 is a high-severity denial of service vulnerability in Linux, published on 21 Nov 2025. 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-2025-40210 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-2025-40210/ (Markdown: https://insights.sbomify.com/CVE-2025-40210/index.md)","id":"CVE-2025-40210","markdown":"https://insights.sbomify.com/CVE-2025-40210/index.md","name":"CVE-2025-40210","record":{"aliases":["AZL-70660","BELL-CVE-2025-40210","DEBIAN-CVE-2025-40210","GHSA-7q3v-wc68-53r6","ROOT-OS-DEBIAN-11-CVE-2025-40210","ROOT-OS-DEBIAN-12-CVE-2025-40210","ROOT-OS-DEBIAN-13-CVE-2025-40210","ROOT-OS-UBUNTU-2204-CVE-2025-40210","ROOT-OS-UBUNTU-2404-CVE-2025-40210","UBUNTU-CVE-2025-40210"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel NFSD","requires_auth":"none","summary":"An attacker can cause a denial of service in the Linux kernel NFSD by sending an NFSv4 COMPOUND request with an excessively large operation count, triggering a memory allocation failure.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"NFSD: Remove the cap on number of operations per NFSv4 COMPOUND\"\n\nI've found that pynfs COMP6 now leaves the connection or lease in a\nstrange state, which causes CLOSE9 to hang indefinitely. I've dug\ninto it a little, but I haven't been able to root-cause it yet.\nHowever, I bisected to commit 48aab1606fa8 (\"NFSD: Remove the cap on\nnumber of operations per NFSv4 COMPOUND\").\n\nTianshuo Han also reports a potential vulnerability when decoding\nan NFSv4 COMPOUND. An attacker can place an arbitrarily large op\ncount in the COMPOUND header, which results in:\n\n[   51.410584] nfsd: vmalloc error: size 1209533382144, exceeds total\npages, mode:0xdc0(GFP_KERNEL|__GFP_ZERO),\nnodemask=(null),cpuset=/,mems_allowed=0\n\nwhen NFSD attempts to allocate the COMPOUND op array.\n\nLet's restore the operation-per-COMPOUND limit, but increased to 200\nfor now.","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":"Revert \"NFSD: Remove the cap on number of operations per NFSv4 COMPOUND\"","id":"CVE-2025-40210","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2025"},"n_packages":0,"n_references":2,"next":{"headline":"ACPI: video: Fix use-after-free in acpi_video_switch_brightness()","id":"CVE-2025-40211"},"packages":[],"prev":{"headline":"btrfs: fix memory leak of qgroup_list in btrfs_add_qgroup_relation","id":"CVE-2025-40209"},"products":["Linux"],"published":"2025-11-21","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":"2026-08-05","vendors":["Linux"]},"summary":"An attacker can cause a denial of service in the Linux kernel NFSD by sending an NFSv4 COMPOUND request with an excessively large operation count, triggering a memory allocation failure.","url":"https://insights.sbomify.com/CVE-2025-40210/"}