{"id":"CVE-2026-68449","summary":"ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning\n\nThe hand-rolled bit-scanning loop in the NCQ completion path has an\ninfinite loop bug.  When tag_mask has only high bits set (e.g.\n0x80000000), the inner while loop left-shifts tag_mask until it\noverflows to 0.  At that point !(0 & 1) is always true and 0 \u003c\u003c= 1\nstays 0, causing an infinite loop in hardirq context with a spinlock\nheld.\n\nReplace the open-coded bit-scanning with __ffs() which correctly\nfinds the least significant set bit and is bounded by the width of\nthe argument.","modified":"2026-08-21T03:30:10.086714042Z","published":"2026-08-12T00:51:47.140Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68449.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954"},{"type":"WEB","url":"https://git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d72e8089dc332ac48293512ef0de77cbe0e04d25"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ea9fa4dabe476f85fe73df30a6ab61a23c22fda4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68449.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68449"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"62936009f35a6659cc3ebe0d90c754182d60da73"},{"fixed":"ea9fa4dabe476f85fe73df30a6ab61a23c22fda4"},{"fixed":"d72e8089dc332ac48293512ef0de77cbe0e04d25"},{"fixed":"4c6e64cae2b2dab32ad9099faa339f6a72c0ce16"},{"fixed":"8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80"},{"fixed":"1842d45f461a78988254631893329bdf4596e954"},{"fixed":"29b916d3556bd12a95be7c56ca391b8cd572f8be"},{"fixed":"c2130f6553f4a5cbdc259de069600117a995f197"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68449.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.36"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68449.json"}}],"schema_version":"1.9.0"}