{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix deadlock in nilfs_count_free_blocks()\n\nA semaphore deadlock can occur if nilfs_get_block() detects metadata\ncorruption while locating data blocks and a superblock writeback occurs at\nthe same time:\n\ntask 1 task 2\n------ ------\n* A file operation *\nnilfs_truncate()\n nilfs_get_block()\n down_read(rwsem A) <--\n nilfs_bmap_lookup_contig()\n ... generic_shutdown_super()\n nilfs_put_super()\n * Prepare to write superblock *\n down_write(rwsem B) <--\n nilfs_cleanup_super()\n * Detect b-tree corruption * nilfs_set_log_cursor()\n nilfs_bmap_convert_error() nilfs_count_free_blocks()\n __nilfs_error() down_read(rwsem A) <--\n nilfs_set_error()\n down_write(rwsem B) <--\n\n *** DEADLOCK ***\n\nHere, nilfs_get_block() readlocks rwsem A (= NILFS_MDT(dat_inode)->mi_sem)\nand then calls nilfs_bmap_lookup_contig(), but if it fails due to metadata\ncorruption, __nilfs_error() is called from nilfs_bmap_convert_error()\ninside the lock section.\n\nSince __nilfs_error() calls nilfs_set_error() unless the filesystem is\nread-only and nilfs_set_error() attempts to writelock rwsem B (=\nnilfs->ns_sem) to write back superblock exclusively, hierarchical lock\nacquisition occurs in the order rwsem A -> rwsem B.\n\nNow, if another task starts updating the superblock, it may writelock\nrwsem B during the lock sequence above, and can deadlock trying to\nreadlock rwsem A in nilfs_count_free_blocks().\n\nHowever, there is actually no need to take rwsem A in\nnilfs_count_free_blocks() because it, within the lock section, only reads\na single integer data on a shared struct with\nnilfs_sufile_get_ncleansegs(). This has been the case after commit\naa474a220180 (\"nilfs2: add local variable to cache the number of clean\nsegments\"), that is, even before this bug was introduced.\n\nSo, this resolves the deadlock problem by just not taking the semaphore in\nnilfs_count_free_blocks().", "category":"general", "title":"Synopsis" } ], "publisher":{ "issuing_authority":"openEuler security committee", "name":"openEuler", "namespace":"https://www.openeuler.org", "contact_details":"openeuler-security@openeuler.org", "category":"vendor" }, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49850" }, { "summary":"CVE-2022-49850 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2022/csaf-openeuler-cve-2022-49850.json" }, { "summary":"openEuler-SA-2025-1513", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1513" }, { "summary":"CVE-2022-49850", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2022-49850&packageName=kernel" } ], "title":"openEuler cve CVE-2022-49850", "tracking":{ "initial_release_date":"2025-05-16T21:24:46+08:00", "revision_history":[ { "date":"2025-05-16T21:24:46+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2025-05-16T21:24:46+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2025-05-16T21:24:46+08:00", "id":"CVE-2022-49850", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:20.03-LTS-SP4" }, "product_id":"openEuler-20.03-LTS-SP4", "name":"openEuler-20.03-LTS-SP4" }, "name":"openEuler-20.03-LTS-SP4", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ 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nilfs_bmap_lookup_contig()\n ... generic_shutdown_super()\n nilfs_put_super()\n * Prepare to write superblock *\n down_write(rwsem B) <--\n nilfs_cleanup_super()\n * Detect b-tree corruption * nilfs_set_log_cursor()\n nilfs_bmap_convert_error() nilfs_count_free_blocks()\n __nilfs_error() down_read(rwsem A) <--\n nilfs_set_error()\n down_write(rwsem B) <--\n\n *** DEADLOCK ***\n\nHere, nilfs_get_block() readlocks rwsem A (= NILFS_MDT(dat_inode)->mi_sem)\nand then calls nilfs_bmap_lookup_contig(), but if it fails due to metadata\ncorruption, __nilfs_error() is called from nilfs_bmap_convert_error()\ninside the lock section.\n\nSince __nilfs_error() calls nilfs_set_error() unless the filesystem is\nread-only and nilfs_set_error() attempts to writelock rwsem B (=\nnilfs->ns_sem) to write back superblock exclusively, hierarchical lock\nacquisition occurs in the order rwsem A -> rwsem B.\n\nNow, if another task starts updating the superblock, it may writelock\nrwsem B during the lock sequence above, and can deadlock trying to\nreadlock rwsem A in nilfs_count_free_blocks().\n\nHowever, there is actually no need to take rwsem A in\nnilfs_count_free_blocks() because it, within the lock section, only reads\na single integer data on a shared struct with\nnilfs_sufile_get_ncleansegs(). This has been the case after commit\naa474a220180 (\"nilfs2: add local variable to cache the number of clean\nsegments\"), that is, even before this bug was introduced.\n\nSo, this resolves the deadlock problem by just not taking the semaphore in\nnilfs_count_free_blocks().", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-20.03-LTS-SP4:bpftool-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:bpftool-debuginfo-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debuginfo-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debugsource-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-devel-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-source-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", 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update", "category":"vendor_fix", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1513" } ], "scores":[ { "cvss_v3":{ "baseSeverity":"MEDIUM", "baseScore":5.5, "vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version":"3.1" }, "products":[ "openEuler-20.03-LTS-SP4:bpftool-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:bpftool-debuginfo-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debuginfo-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debugsource-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-devel-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-source-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-tools-4.19.90-2505.3.0.0327.oe2003sp4.aarch64", 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"openEuler-20.03-LTS-SP4:kernel-4.19.90-2505.3.0.0327.oe2003sp4.src" ] } ], "threats":[ { "details":"Medium", "category":"impact" } ], "title":"CVE-2022-49850" } ] }