{"id":"CVE-2025-71266","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs: ntfs3: check return value of indx_find to avoid infinite loop\n\nWe found an infinite loop bug in the ntfs3 file system that can lead to a\nDenial-of-Service (DoS) con…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs: ntfs3: check return value of indx_find to avoid infinite loop\n\nWe found an infinite loop bug in the ntfs3 file system that can lead to a\nDenial-of-Service (DoS) con…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-835"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.15.1, < 5.15.202","linux_kernel >= 5.16, < 6.1.165","linux_kernel >= 6.2, < 6.6.128","linux_kernel >= 6.7, < 6.12.75","linux_kernel >= 6.13, < 6.18.16","linux_kernel >= 6.19, < 6.19.6","linux_kernel = 5.15"],"patched":["linux_kernel 6.19.6"],"published":"2026-03-18","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:18:25.627","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-71266","references":[{"url":"https://git.kernel.org/stable/c/0ad7a1be44479503dbe5c699759861ef5b8bd70c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/14c3188afbedfd5178bbabb8002487ea14b37b56","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1732053c8a6b360e2d5afb1b34fe9779398b072c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/398e768d1accd1f5645492ab996005d7aa84a5b0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/435d34719db0e130f6f0c621d67ed524cc1a7d10","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/68e32694be231c1cdb99b7637a657314e88e1a96","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b0ea441f44ce64fa514a415d4a9e6e2b06e7946c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00129,"epssPercentile":0.02559,"ingestedAt":"2026-09-08T15:33:26.994Z","slug":"CVE-2025-71266","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nfs: ntfs3: check return value of indx_find to avoid infinite loop\n\nWe found an infinite loop bug in the ntfs3 file system that can lead to a\nDenial-of-Service (DoS) condition.\n\nA malformed dentry in the ntfs3 filesystem can cause the kernel to hang\nduring the lookup operations. By setting the HAS_SUB_NODE flag in an\nINDEX_ENTRY within a directory's INDEX_ALLOCATION block and manipulating the\nVCN pointer, an attacker can cause the indx_find() function to repeatedly\nread the same block, allocating 4 KB of memory each time. The kernel lacks\nVCN loop detection and depth limits, causing memory exhaustion and an OOM\ncrash.\n\nThis patch adds a return value check for fnd_push() to prevent a memory\nexhaustion vulnerability caused by infinite loops. When the index exceeds the\nsize of the fnd->nodes array, fnd_push() returns -EINVAL. The indx_find()\nfunction checks this return value and stops processing, preventing further\nmemory allocation.\n\n## Affected\n\n- `linux_kernel >= 5.15.1, < 5.15.202`\n- `linux_kernel >= 5.16, < 6.1.165`\n- `linux_kernel >= 6.2, < 6.6.128`\n- `linux_kernel >= 6.7, < 6.12.75`\n- `linux_kernel >= 6.13, < 6.18.16`\n- `linux_kernel >= 6.19, < 6.19.6`\n- `linux_kernel = 5.15`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.19.6`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":221639,"id":"CVE-2025-71266","ts":1792035297428,"field":"cvss","old":null,"new":"5.5"},{"seq":221638,"id":"CVE-2025-71266","ts":1792035297428,"field":"severity","old":"none","new":"medium"}]}