CVE-2026-31688

{"id": "CVE-2026-31688", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2026-04-27T18:16:54.287", "references": [{"url": "https://git.kernel.org/stable/c/dc23806a7c47ec5f1293aba407fb69519f976ee0", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndriver core: enforce device_lock for driver_match_device()\n\nCurrently, driver_match_device() is called from three sites. One site\n(__device_attach_driver) holds device_lock(dev), but the other two\n(bind_store and __driver_attach) do not. This inconsistency means that\nbus match() callbacks are not guaranteed to be called with the lock\nheld.\n\nFix this by introducing driver_match_device_locked(), which guarantees\nholding the device lock using a scoped guard. Replace the unlocked calls\nin bind_store() and __driver_attach() with this new helper. Also add a\nlock assertion to driver_match_device() to enforce this guarantee.\n\nThis consistency also fixes a known race condition. The driver_override\nimplementation relies on the device_lock, so the missing lock led to the\nuse-after-free (UAF) reported in Bugzilla for buses using this field.\n\nStress testing the two newly locked paths for 24 hours with\nCONFIG_PROVE_LOCKING and CONFIG_LOCKDEP enabled showed no UAF recurrence\nand no lockdep warnings."}], "lastModified": "2026-05-06T18:36:57.093", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "81C6A49A-929A-40D2-9FF9-222A3E70FAB9", "versionEndExcluding": "7.0", "versionStartIncluding": "2.6.30"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}