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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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        "summary": "Canonical URL",
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          "date": "2022-01-01T00:00:00Z",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix race condition between ext4_write and ext4_convert_inline_data\n\nHulk Robot reported a BUG_ON:\n ==================================================================\n EXT4-fs error (device loop3): ext4_mb_generate_buddy:805: group 0,\n block bitmap and bg descriptor inconsistent: 25 vs 31513 free clusters\n kernel BUG at fs/ext4/ext4_jbd2.c:53!\n invalid opcode: 0000 [#1] SMP KASAN PTI\n CPU: 0 PID: 25371 Comm: syz-executor.3 Not tainted 5.10.0+ #1\n RIP: 0010:ext4_put_nojournal fs/ext4/ext4_jbd2.c:53 [inline]\n RIP: 0010:__ext4_journal_stop+0x10e/0x110 fs/ext4/ext4_jbd2.c:116\n [...]\n Call Trace:\n  ext4_write_inline_data_end+0x59a/0x730 fs/ext4/inline.c:795\n  generic_perform_write+0x279/0x3c0 mm/filemap.c:3344\n  ext4_buffered_write_iter+0x2e3/0x3d0 fs/ext4/file.c:270\n  ext4_file_write_iter+0x30a/0x11c0 fs/ext4/file.c:520\n  do_iter_readv_writev+0x339/0x3c0 fs/read_write.c:732\n  do_iter_write+0x107/0x430 fs/read_write.c:861\n  vfs_writev fs/read_write.c:934 [inline]\n  do_pwritev+0x1e5/0x380 fs/read_write.c:1031\n [...]\n ==================================================================\n\nAbove issue may happen as follows:\n           cpu1                     cpu2\n__________________________|__________________________\ndo_pwritev\n vfs_writev\n  do_iter_write\n   ext4_file_write_iter\n    ext4_buffered_write_iter\n     generic_perform_write\n      ext4_da_write_begin\n                           vfs_fallocate\n                            ext4_fallocate\n                             ext4_convert_inline_data\n                              ext4_convert_inline_data_nolock\n                               ext4_destroy_inline_data_nolock\n                                clear EXT4_STATE_MAY_INLINE_DATA\n                               ext4_map_blocks\n                                ext4_ext_map_blocks\n                                 ext4_mb_new_blocks\n                                  ext4_mb_regular_allocator\n                                   ext4_mb_good_group_nolock\n                                    ext4_mb_init_group\n                                     ext4_mb_init_cache\n                                      ext4_mb_generate_buddy  --> error\n       ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)\n                                ext4_restore_inline_data\n                                 set EXT4_STATE_MAY_INLINE_DATA\n       ext4_block_write_begin\n      ext4_da_write_end\n       ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)\n       ext4_write_inline_data_end\n        handle=NULL\n        ext4_journal_stop(handle)\n         __ext4_journal_stop\n          ext4_put_nojournal(handle)\n           ref_cnt = (unsigned long)handle\n           BUG_ON(ref_cnt == 0)  ---> BUG_ON\n\nThe lock held by ext4_convert_inline_data is xattr_sem, but the lock\nheld by generic_perform_write is i_rwsem. Therefore, the two locks can\nbe concurrent.\n\nTo solve above issue, we add inode_lock() for ext4_convert_inline_data().\nAt the same time, move ext4_convert_inline_data() in front of\next4_punch_hole(), remove similar handling from ext4_punch_hole().",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "known_affected": [
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2022-49414"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/14602353b350950b551eccc6b46411aa3b12ffe2",
          "url": "https://git.kernel.org/stable/c/14602353b350950b551eccc6b46411aa3b12ffe2"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/18881d7e517169193d9ef6c89c7f322e3e164277",
          "url": "https://git.kernel.org/stable/c/18881d7e517169193d9ef6c89c7f322e3e164277"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/725e00cb7039eae291890f1bb19bc867176745f6",
          "url": "https://git.kernel.org/stable/c/725e00cb7039eae291890f1bb19bc867176745f6"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/91f90b571f1a23f5b8a9c2b68a9aa5d6981a3c3d",
          "url": "https://git.kernel.org/stable/c/91f90b571f1a23f5b8a9c2b68a9aa5d6981a3c3d"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/ccc6639f831bee91aa8b41c8a1cdd020ecfb9f32",
          "url": "https://git.kernel.org/stable/c/ccc6639f831bee91aa8b41c8a1cdd020ecfb9f32"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f87c7a4b084afc13190cbb263538e444cb2b392a",
          "url": "https://git.kernel.org/stable/c/f87c7a4b084afc13190cbb263538e444cb2b392a"
        }
      ],
      "release_date": "2025-02-26T07:01:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-01T15:45:37.621978Z",
          "details": "This is a local-only race in the ext4 filesystem that manifests only when the non‑default inline_data feature is enabled and a write is precisely raced with a fallocate‑triggered inline‑to‑extent conversion, conditions absent on default ext4 volumes. Exploitation requires a local user with write access and high‑precision timing (CVSS: AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H) and the effect is limited to availability (kernel crash) with no confidentiality or integrity impact. Given these preconditions and the DoS‑only outcome, it is reasonable to deprioritize in managed server/VM deployments using ext4’s default feature set.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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          "details": "Moderate"
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    }
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}