{"cve":"CVE-2026-68179","nvd":{"published":"2026-08-10T13:20:04.847","modified":"2026-10-19T21:17:57.107","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: nsm: only unlock nsm_dev on post-lock error paths\n\nnsm_dev_ioctl() jumps to the common out label even when the initial\ncopy_from_user() fails before nsm->lock has been taken.  The error path\nthen blindly unlocks a mutex that was never acquired.\n\nThis issue was found by our static analysis tool and then manually\nreviewed against the current tree.\n\nThe grounded PoC kept the miscdevice ioctl entry and the pre-lock\ncopy_from_user(&raw, argp, _IOC_SIZE(cmd)) failure path by issuing\nNSM_IOCTL_RAW with an invalid user pointer.  That failure reaches the\nshared out label before mutex_lock(&nsm->lock).  Lockdep reported:\n\n  WARNING: bad unlock balance detected!\n  exploit/193 is trying to release lock (&global_nsm.lock) at:\n  nsm_dev_ioctl+0x5f/0xcf [vuln_msv]\n  but there are no more locks to release!\n  no locks held by exploit/193.\n\nReturn immediately on the pre-lock copy_from_user() failure and keep the\ncommon unlock label for the post-lock paths only.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.4},"cwes":["CWE-675"],"references":["https://git.kernel.org/stable/c/4aa3f7d48e91eb74a363c1b4d7dbdd28f5b341fb","https://git.kernel.org/stable/c/8f068342096b027181b168d91fef7ac7a2c64b25","https://git.kernel.org/stable/c/ce1fed11d18e163baf7f875152a33bf80f625c1a","https://git.kernel.org/stable/c/f318f5a872cb9096536e759b23ae5c9873bb80ed"],"products":[],"source":"nvd","synced_at":"2026-10-21T03:56:58.798400159+00:00"},"epss":{"cve":"CVE-2026-68179","score":0.00181,"percentile":0.07582,"date":"2026-10-25"},"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."]}