{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68179", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.373Z", "datePublished": "2026-08-10T11:59:50.667Z", "dateUpdated": "2026-08-10T11:59:50.667Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-10T11:59:50.667Z"}, "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/misc/nsm.c"], "versions": [{"version": "b9873755a6c8ccfce79094c4dce9efa3ecb1a749", "lessThan": "4aa3f7d48e91eb74a363c1b4d7dbdd28f5b341fb", "status": "affected", "versionType": "git"}, {"version": "b9873755a6c8ccfce79094c4dce9efa3ecb1a749", "lessThan": "8f068342096b027181b168d91fef7ac7a2c64b25", "status": "affected", "versionType": "git"}, {"version": "b9873755a6c8ccfce79094c4dce9efa3ecb1a749", "lessThan": "f318f5a872cb9096536e759b23ae5c9873bb80ed", "status": "affected", "versionType": "git"}, {"version": "b9873755a6c8ccfce79094c4dce9efa3ecb1a749", "lessThan": "ce1fed11d18e163baf7f875152a33bf80f625c1a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/misc/nsm.c"], "versions": [{"version": "6.8", "status": "affected"}, {"version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc5", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.2-rc5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4aa3f7d48e91eb74a363c1b4d7dbdd28f5b341fb"}, {"url": "https://git.kernel.org/stable/c/8f068342096b027181b168d91fef7ac7a2c64b25"}, {"url": "https://git.kernel.org/stable/c/f318f5a872cb9096536e759b23ae5c9873bb80ed"}, {"url": "https://git.kernel.org/stable/c/ce1fed11d18e163baf7f875152a33bf80f625c1a"}], "title": "misc: nsm: only unlock nsm_dev on post-lock error paths", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[b9873755a6c8ccfce79094c4dce9efa3ecb1a749,4aa3f7d48e91eb74a363c1b4d7dbdd28f5b341fb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[b9873755a6c8ccfce79094c4dce9efa3ecb1a749,8f068342096b027181b168d91fef7ac7a2c64b25)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[b9873755a6c8ccfce79094c4dce9efa3ecb1a749,f318f5a872cb9096536e759b23ae5c9873bb80ed)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[b9873755a6c8ccfce79094c4dce9efa3ecb1a749,ce1fed11d18e163baf7f875152a33bf80f625c1a)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T14:45:18.124993+00:00", "title": "Race Condition Causing Unlock of Unacquired Mutex in Linux Kernel", "updated": "2026-08-10T17:15:02.920168+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-362"]}