{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2022-50534", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-50534", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-10-07T15:19:23.958Z", "updatedAt": "2026-05-11T19:21:17.171Z", "importedAt": "2026-10-24T01:56:49.724Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "dm thin: Use last transaction's pmd->root when commit failed", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm thin: Use last transaction's pmd->root when commit failed\n\nRecently we found a softlock up problem in dm thin pool btree lookup\ncode due to corrupted metadata:\n\n Kernel panic - not syncing: softlockup: hung tasks\n CPU: 7 PID: 2669225 Comm: kworker/u16:3\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\n Workqueue: dm-thin do_worker [dm_thin_pool]\n Call Trace:\n \n dump_stack+0x9c/0xd3\n panic+0x35d/0x6b9\n watchdog_timer_fn.cold+0x16/0x25\n __run_hrtimer+0xa2/0x2d0\n \n RIP: 0010:__relink_lru+0x102/0x220 [dm_bufio]\n __bufio_new+0x11f/0x4f0 [dm_bufio]\n new_read+0xa3/0x1e0 [dm_bufio]\n dm_bm_read_lock+0x33/0xd0 [dm_persistent_data]\n ro_step+0x63/0x100 [dm_persistent_data]\n btree_lookup_raw.constprop.0+0x44/0x220 [dm_persistent_data]\n dm_btree_lookup+0x16f/0x210 [dm_persistent_data]\n dm_thin_find_block+0x12c/0x210 [dm_thin_pool]\n __process_bio_read_only+0xc5/0x400 [dm_thin_pool]\n process_thin_deferred_bios+0x1a4/0x4a0 [dm_thin_pool]\n process_one_work+0x3c5/0x730\n\nFollowing process may generate a broken btree mixed with fresh and\nstale btree nodes, which could get dm thin trapped in an infinite loop\nwhile looking up data block:\n Transaction 1: pmd->root = A, A->B->C // One path in btree\n pmd->root = X, X->Y->Z // Copy-up\n Transaction 2: X,Z is updated on disk, Y write failed.\n // Commit failed, dm thin becomes read-only.\n process_bio_read_only\n\t\t dm_thin_find_block\n\t\t __find_block\n\t\t dm_btree_lookup(pmd->root)\nThe pmd->root points to a broken btree, Y may contain stale node\npointing to any block, for example X, which gets dm thin trapped into\na dead loop while looking up Z.\n\nFix this by setting pmd->root in __open_metadata(), so that dm thin\nwill use the last transaction's pmd->root if commit failed.\n\nFetch a reproducer in [Link].\n\nLinke: https://bugzilla.kernel.org/show_bug.cgi?id=216790", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "b35a22760aa5008d82533e59b0f0b5eb1b02d4e5" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "87d69b8824ca9b090f5a8ed47f758e8f6eecb871" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "3db757ffdd87ed8d7118b2250236a496502a660f" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "f758987ff0af3a4b5ee69e95cab6a5294e4367b0" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "94f01ecc2aa0be992865acc80ebb6701f731f955" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "4b710e8481ade7c9200e94d3018e99dc42a0a0e8" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "a63ce4eca86fd207e3db07c00fb7ccf4adf1b230" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "b91f481300e3a10eaf66b94fc39b740928762aaf" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "7991dbff6849f67e823b7cc0c15e5a90b0549b9f" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.2", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.2" }, { "version": "4.9.337", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.9.*" }, { "version": "4.14.303", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.270", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.229", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.163", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.87", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.0.18", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.0.*" }, { "version": "6.1.4", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }