{"id":"CVE-2026-53123","title":"md: wake raid456 reshape waiters before suspend","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmd: wake raid456 reshape waiters before suspend\n\nDuring raid456 reshape, direct IO across the reshape position can sleep\nin raid5_make_request() waiting for reshape pro…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 714d20150ed85811193ae07a494d91f9927c590f < 8b6a72420821e6da2cab6a69d5233500d2698b93","Linux >= 714d20150ed85811193ae07a494d91f9927c590f < ff6b93410192b812d73cc54062529715b2dc849f","Linux >= 714d20150ed85811193ae07a494d91f9927c590f < 8ae3e14d7f3df58f7f49c02d74344e3dcd5f84f0","Linux >= 714d20150ed85811193ae07a494d91f9927c590f < cf86bb53b9c92354904a328e947a05ffbfdd1840","Linux 2284eab166f2df83f94f0422e15dc9e73b278abf","Linux >= 6.6.160 < 6.7","Linux 6.7"],"published":"2026-06-24","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:42:09.638Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53123","references":[{"url":"https://git.kernel.org/stable/c/8b6a72420821e6da2cab6a69d5233500d2698b93"},{"url":"https://git.kernel.org/stable/c/ff6b93410192b812d73cc54062529715b2dc849f"},{"url":"https://git.kernel.org/stable/c/8ae3e14d7f3df58f7f49c02d74344e3dcd5f84f0"},{"url":"https://git.kernel.org/stable/c/cf86bb53b9c92354904a328e947a05ffbfdd1840"}],"tags":["cve.org"],"epss":0.00116,"epssPercentile":0.01537,"ingestedAt":"2026-10-21T12:48:53.622Z","slug":"CVE-2026-53123","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmd: wake raid456 reshape waiters before suspend\n\nDuring raid456 reshape, direct IO across the reshape position can sleep\nin raid5_make_request() waiting for reshape progress while still\nholding an active_io reference. If userspace then freezes reshape and\nwrites md/suspend_lo or md/suspend_hi, mddev_suspend() kills active_io\nand waits for all in-flight IO to drain.\n\nThis can deadlock: the IO needs reshape progress to continue, but the\nreshape thread is already frozen, so the active_io reference is never\ndropped and suspend never completes.\n\nraid5_prepare_suspend() already wakes wait_for_reshape for dm-raid. Do\nthe same for normal md suspend when reshape is already interrupted, so\nwaiting raid456 IO can abort, drop its reference, and let suspend\nfinish.\n\nThe mdadm test tests/25raid456-reshape-deadlock reproduces the hang.\n\n## Affected\n\n- `Linux >= 714d20150ed85811193ae07a494d91f9927c590f < 8b6a72420821e6da2cab6a69d5233500d2698b93`\n- `Linux >= 714d20150ed85811193ae07a494d91f9927c590f < ff6b93410192b812d73cc54062529715b2dc849f`\n- `Linux >= 714d20150ed85811193ae07a494d91f9927c590f < 8ae3e14d7f3df58f7f49c02d74344e3dcd5f84f0`\n- `Linux >= 714d20150ed85811193ae07a494d91f9927c590f < cf86bb53b9c92354904a328e947a05ffbfdd1840`\n- `Linux 2284eab166f2df83f94f0422e15dc9e73b278abf`\n- `Linux >= 6.6.160 < 6.7`\n- `Linux 6.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}