{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-71067 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-71067 is a vulnerability in Linux, published on 13 Jan 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-2025-71067 and fix it if it is affected.\n\nWhat it is: CVE-2025-71067 is a vulnerability in Linux, published on 13 Jan 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-2025-71067 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-2025-71067/ (Markdown: https://insights.sbomify.com/CVE-2025-71067/index.md)","id":"CVE-2025-71067","markdown":"https://insights.sbomify.com/CVE-2025-71067/index.md","name":"CVE-2025-71067","record":{"aliases":["BELL-CVE-2025-71067","DEBIAN-CVE-2025-71067","GHSA-wq7w-gfpq-89g4","ROOT-OS-DEBIAN-12-CVE-2025-71067","ROOT-OS-DEBIAN-13-CVE-2025-71067","ROOT-OS-UBUNTU-2204-CVE-2025-71067","ROOT-OS-UBUNTU-2404-CVE-2025-71067","UBUNTU-CVE-2025-71067"],"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":"low_privilege","summary":"A local attacker can cause a denial of service in the Linux kernel by mounting a crafted NTFS filesystem with a large block size, triggering a null dereference.","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\nntfs: set dummy blocksize to read boot_block when mounting\n\nWhen mounting, sb-\u003es_blocksize is used to read the boot_block without\nbeing defined or validated. Set a dummy blocksize before attempting to\nread the boot_block.\n\nThe issue can be triggered with the following syz reproducer:\n\n  mkdirat(0xffffffffffffff9c, \u0026(0x7f0000000080)='./file1\\x00', 0x0)\n  r4 = openat$nullb(0xffffffffffffff9c, \u0026(0x7f0000000040), 0x121403, 0x0)\n  ioctl$FS_IOC_SETFLAGS(r4, 0x40081271, \u0026(0x7f0000000980)=0x4000)\n  mount(\u0026(0x7f0000000140)=@nullb, \u0026(0x7f0000000040)='./cgroup\\x00',\n        \u0026(0x7f0000000000)='ntfs3\\x00', 0x2208004, 0x0)\n  syz_clone(0x88200200, 0x0, 0x0, 0x0, 0x0, 0x0)\n\nHere, the ioctl sets the bdev block size to 16384. During mount,\nget_tree_bdev_flags() calls sb_set_blocksize(sb, block_size(bdev)),\nbut since block_size(bdev) \u003e PAGE_SIZE, sb_set_blocksize() leaves\nsb-\u003es_blocksize at zero.\n\nLater, ntfs_init_from_boot() attempts to read the boot_block while\nsb-\u003es_blocksize is still zero, which triggers the bug.\n\n[almaz.alexandrovich@paragon-software.com: changed comment style, added\nreturn value handling]","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":"ntfs: set dummy blocksize to read boot_block when mounting","id":"CVE-2025-71067","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"null_dereference","year":"2025"},"n_packages":0,"n_references":5,"next":{"headline":"svcrdma: bound check rq_pages index in inline path","id":"CVE-2025-71068"},"packages":[],"prev":{"headline":"net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change","id":"CVE-2025-71066"},"products":["Linux"],"published":"2026-01-13","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":"2026-05-11","vendors":["Linux"]},"summary":"A local attacker can cause a denial of service in the Linux kernel by mounting a crafted NTFS filesystem with a large block size, triggering a null dereference.","url":"https://insights.sbomify.com/CVE-2025-71067/"}