{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50534", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-10-07T15:15:38.665Z", "datePublished": "2025-10-07T15:19:23.958Z", "dateUpdated": "2026-05-11T19:21:17.171Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:21:17.171Z" }, "descriptions": [ { "lang": "en", "value": "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": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/md/dm-thin-metadata.c" ], "versions": [ { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "b35a22760aa5008d82533e59b0f0b5eb1b02d4e5", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "87d69b8824ca9b090f5a8ed47f758e8f6eecb871", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "3db757ffdd87ed8d7118b2250236a496502a660f", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "f758987ff0af3a4b5ee69e95cab6a5294e4367b0", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "94f01ecc2aa0be992865acc80ebb6701f731f955", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "4b710e8481ade7c9200e94d3018e99dc42a0a0e8", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "a63ce4eca86fd207e3db07c00fb7ccf4adf1b230", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "b91f481300e3a10eaf66b94fc39b740928762aaf", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "7991dbff6849f67e823b7cc0c15e5a90b0549b9f", "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/md/dm-thin-metadata.c" ], "versions": [ { "version": "3.2", "status": "affected" }, { "version": "0", "lessThan": "3.2", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.337", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.303", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.270", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.229", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.163", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.87", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.18", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.4", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "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": "3.2", "versionEndExcluding": "4.9.337" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "4.14.303" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "4.19.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.15.87" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.0.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b35a22760aa5008d82533e59b0f0b5eb1b02d4e5" }, { "url": "https://git.kernel.org/stable/c/87d69b8824ca9b090f5a8ed47f758e8f6eecb871" }, { "url": "https://git.kernel.org/stable/c/3db757ffdd87ed8d7118b2250236a496502a660f" }, { "url": "https://git.kernel.org/stable/c/f758987ff0af3a4b5ee69e95cab6a5294e4367b0" }, { "url": "https://git.kernel.org/stable/c/94f01ecc2aa0be992865acc80ebb6701f731f955" }, { "url": "https://git.kernel.org/stable/c/4b710e8481ade7c9200e94d3018e99dc42a0a0e8" }, { "url": "https://git.kernel.org/stable/c/a63ce4eca86fd207e3db07c00fb7ccf4adf1b230" }, { "url": "https://git.kernel.org/stable/c/b91f481300e3a10eaf66b94fc39b740928762aaf" }, { "url": "https://git.kernel.org/stable/c/7991dbff6849f67e823b7cc0c15e5a90b0549b9f" } ], "title": "dm thin: Use last transaction's pmd->root when commit failed", "x_generator": { "engine": "bippy-1.2.0" } } } }