CVE-2026-68179High· 8.4▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: misc: nsm: only unlock nsm_dev on post-lock error paths nsm_dev_ioctl() jumps to the common out label even when the initial copy_from_user() fails before nsm->lock has…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 46.2 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
misc: nsm: only unlock nsm_dev on post-lock error paths
nsm_dev_ioctl() jumps to the common out label even when the initial copy_from_user() fails before nsm->lock has been taken. The error path then blindly unlocks a mutex that was never acquired.
This issue was found by our static analysis tool and then manually reviewed against the current tree.
The grounded PoC kept the miscdevice ioctl entry and the pre-lock copy_from_user(&raw, argp, _IOC_SIZE(cmd)) failure path by issuing NSM_IOCTL_RAW with an invalid user pointer. That failure reaches the shared out label before mutex_lock(&nsm->lock). Lockdep reported:
WARNING: bad unlock balance detected! exploit/193 is trying to release lock (&global_nsm.lock) at: nsm_dev_ioctl+0x5f/0xcf [vuln_msv] but there are no more locks to release! no locks held by exploit/193.
Return immediately on the pre-lock copy_from_user() failure and keep the common unlock label for the post-lock paths only.
Linux >= b9873755a6c8ccfce79094c4dce9efa3ecb1a749 < 4aa3f7d48e91eb74a363c1b4d7dbdd28f5b341fbLinux >= b9873755a6c8ccfce79094c4dce9efa3ecb1a749 < 8f068342096b027181b168d91fef7ac7a2c64b25Linux >= b9873755a6c8ccfce79094c4dce9efa3ecb1a749 < f318f5a872cb9096536e759b23ae5c9873bb80edLinux >= b9873755a6c8ccfce79094c4dce9efa3ecb1a749 < ce1fed11d18e163baf7f875152a33bf80f625c1aLinux 6.8Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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