{"dataType": "CVE_RECORD", "dataVersion": "5.1", "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": "2025-10-07T15:19:23.958Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-10-07T15:19:23.958Z"}, "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 <IRQ>\n dump_stack+0x9c/0xd3\n panic+0x35d/0x6b9\n watchdog_timer_fn.cold+0x16/0x25\n __run_hrtimer+0xa2/0x2d0\n </IRQ>\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", 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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 <IRQ>\n dump_stack+0x9c/0xd3\n panic+0x35d/0x6b9\n watchdog_timer_fn.cold+0x16/0x25\n __run_hrtimer+0xa2/0x2d0\n </IRQ>\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"}], "id": "CVE-2022-50534", "lastModified": "2026-02-05T15:16:12.153", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-10-07T16:15:37.530", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3db757ffdd87ed8d7118b2250236a496502a660f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4b710e8481ade7c9200e94d3018e99dc42a0a0e8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7991dbff6849f67e823b7cc0c15e5a90b0549b9f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/87d69b8824ca9b090f5a8ed47f758e8f6eecb871"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94f01ecc2aa0be992865acc80ebb6701f731f955"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a63ce4eca86fd207e3db07c00fb7ccf4adf1b230"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b35a22760aa5008d82533e59b0f0b5eb1b02d4e5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b91f481300e3a10eaf66b94fc39b740928762aaf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f758987ff0af3a4b5ee69e95cab6a5294e4367b0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: dm thin: Use last transaction's pmd->root when commit failed", "id": "2402282", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2402282"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2022-50534", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:rhivos:1", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat In-Vehicle Operating System 1"}], "public_date": "2025-10-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50534\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50534\nhttps://lore.kernel.org/linux-cve-announce/2025100708-CVE-2022-50534-8900@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-10-08T13:36:25.111688+00:00", "updated": "2025-10-08T13:36:25.111714+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}