{"cve":"CVE-2026-64251","nvd":{"published":"2026-07-24T16:16:54.713","modified":"2026-08-17T05:17:23.550","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npwrseq: core: fix use-after-free in pwrseq_debugfs_seq_next()\n\npwrseq_debugfs_seq_next() declares 'next' with __free(put_device),\nwhich causes put_device() to be called on the returned pointer when\nthe variable goes out of scope.  This results in a use-after-free\nsince the seq_file framework receives a pointer whose reference has\nalready been dropped.\n\nSimply removing __free(put_device) would fix the UAF but would leak\nthe reference acquired by bus_find_next_device(), as stop() only\ncalls up_read(&pwrseq_sem) and never releases the device reference.\n\nFix this by making the reference counting consistent across all\nseq_file callbacks, matching the standard pattern used by PCI and\nSCSI:\n\n- start(): use get_device() so it returns a referenced pointer.\n- next(): explicitly put_device(curr) to release the previous\n  device's reference (no NULL check needed - the seq_file framework\n  only calls next() while the previous return was non-NULL).\n- stop(): put_device(data) to release the last iterated device's\n  reference, with a NULL guard since stop() may be called with NULL\n  when start() returned NULL or next() reached end-of-sequence.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/257595adf9dac15ae1edd9d07753fbc576a7583d","https://git.kernel.org/stable/c/73569a44fca2992f0ca4a4c0104069741b9873a0","https://git.kernel.org/stable/c/ba0b9f04c7a5f9887b8ce672eaf049502c0548ec","https://git.kernel.org/stable/c/e91df6d273445c03f5aa302bfe147eda33d45794"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:46:40.600842820+00:00"},"epss":{"cve":"CVE-2026-64251","score":0.0017,"percentile":0.06377,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}