CVE-2023-53317 (GCVE-0-2023-53317)
Vulnerability from cvelistv5
Published
2025-09-16 16:11
Modified
2025-09-16 16:11
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix WARNING in mb_find_extent Syzbot found the following issue: EXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, O_DIRECT and fast_commit support! EXT4-fs (loop0): orphan cleanup on readonly fs ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5067 at fs/ext4/mballoc.c:1869 mb_find_extent+0x8a1/0xe30 Modules linked in: CPU: 1 PID: 5067 Comm: syz-executor307 Not tainted 6.2.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:mb_find_extent+0x8a1/0xe30 fs/ext4/mballoc.c:1869 RSP: 0018:ffffc90003c9e098 EFLAGS: 00010293 RAX: ffffffff82405731 RBX: 0000000000000041 RCX: ffff8880783457c0 RDX: 0000000000000000 RSI: 0000000000000041 RDI: 0000000000000040 RBP: 0000000000000040 R08: ffffffff82405723 R09: ffffed10053c9402 R10: ffffed10053c9402 R11: 1ffff110053c9401 R12: 0000000000000000 R13: ffffc90003c9e538 R14: dffffc0000000000 R15: ffffc90003c9e2cc FS: 0000555556665300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056312f6796f8 CR3: 0000000022437000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ext4_mb_complex_scan_group+0x353/0x1100 fs/ext4/mballoc.c:2307 ext4_mb_regular_allocator+0x1533/0x3860 fs/ext4/mballoc.c:2735 ext4_mb_new_blocks+0xddf/0x3db0 fs/ext4/mballoc.c:5605 ext4_ext_map_blocks+0x1868/0x6880 fs/ext4/extents.c:4286 ext4_map_blocks+0xa49/0x1cc0 fs/ext4/inode.c:651 ext4_getblk+0x1b9/0x770 fs/ext4/inode.c:864 ext4_bread+0x2a/0x170 fs/ext4/inode.c:920 ext4_quota_write+0x225/0x570 fs/ext4/super.c:7105 write_blk fs/quota/quota_tree.c:64 [inline] get_free_dqblk+0x34a/0x6d0 fs/quota/quota_tree.c:130 do_insert_tree+0x26b/0x1aa0 fs/quota/quota_tree.c:340 do_insert_tree+0x722/0x1aa0 fs/quota/quota_tree.c:375 do_insert_tree+0x722/0x1aa0 fs/quota/quota_tree.c:375 do_insert_tree+0x722/0x1aa0 fs/quota/quota_tree.c:375 dq_insert_tree fs/quota/quota_tree.c:401 [inline] qtree_write_dquot+0x3b6/0x530 fs/quota/quota_tree.c:420 v2_write_dquot+0x11b/0x190 fs/quota/quota_v2.c:358 dquot_acquire+0x348/0x670 fs/quota/dquot.c:444 ext4_acquire_dquot+0x2dc/0x400 fs/ext4/super.c:6740 dqget+0x999/0xdc0 fs/quota/dquot.c:914 __dquot_initialize+0x3d0/0xcf0 fs/quota/dquot.c:1492 ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0xb60/0x1340 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5516 [inline] ext4_fill_super+0x81cd/0x8700 fs/ext4/super.c:5644 get_tree_bdev+0x400/0x620 fs/super.c:1282 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Add some debug information: mb_find_extent: mb_find_extent block=41, order=0 needed=64 next=0 ex=0/41/1@3735929054 64 64 7 block_bitmap: ff 3f 0c 00 fc 01 00 00 d2 3d 00 00 00 00 00 00 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff Acctually, blocks per group is 64, but block bitmap indicate at least has 128 blocks. Now, ext4_validate_block_bitmap() didn't check invalid block's bitmap if set. To resolve above issue, add check like fsck "Padding at end of block bitmap is not set".
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1b90fbc7590124c57a2e590de7fd07eba26606f1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5d356d902e9d5b1aaaaf2326d365340fa8a90c1b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/775b00ba23f6f916fe2ac60c5ff7fd0fe4f28d0d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d55e76e11592a1d18a179c7fd34ca1b52632beb3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dba62fa84a8eac44a53a2862de8a40e5bdfa0ae3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd45e536f47a82e0a405f9a4b6c7ceb367171ee9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e4d503c956a744cb59e509ca5f134cfad423c7a3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fa08a7b61dff8a4df11ff1e84abfc214b487caf7
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix WARNING in mb_find_extent\n\nSyzbot found the following issue:\n\nEXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, O_DIRECT and fast_commit support!\nEXT4-fs (loop0): orphan cleanup on readonly fs\n------------[ cut here ]------------\nWARNING: CPU: 1 PID: 5067 at fs/ext4/mballoc.c:1869 mb_find_extent+0x8a1/0xe30\nModules linked in:\nCPU: 1 PID: 5067 Comm: syz-executor307 Not tainted 6.2.0-rc1-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nRIP: 0010:mb_find_extent+0x8a1/0xe30 fs/ext4/mballoc.c:1869\nRSP: 0018:ffffc90003c9e098 EFLAGS: 00010293\nRAX: ffffffff82405731 RBX: 0000000000000041 RCX: ffff8880783457c0\nRDX: 0000000000000000 RSI: 0000000000000041 RDI: 0000000000000040\nRBP: 0000000000000040 R08: ffffffff82405723 R09: ffffed10053c9402\nR10: ffffed10053c9402 R11: 1ffff110053c9401 R12: 0000000000000000\nR13: ffffc90003c9e538 R14: dffffc0000000000 R15: ffffc90003c9e2cc\nFS:  0000555556665300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000056312f6796f8 CR3: 0000000022437000 CR4: 00000000003506e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n ext4_mb_complex_scan_group+0x353/0x1100 fs/ext4/mballoc.c:2307\n ext4_mb_regular_allocator+0x1533/0x3860 fs/ext4/mballoc.c:2735\n ext4_mb_new_blocks+0xddf/0x3db0 fs/ext4/mballoc.c:5605\n ext4_ext_map_blocks+0x1868/0x6880 fs/ext4/extents.c:4286\n ext4_map_blocks+0xa49/0x1cc0 fs/ext4/inode.c:651\n ext4_getblk+0x1b9/0x770 fs/ext4/inode.c:864\n ext4_bread+0x2a/0x170 fs/ext4/inode.c:920\n ext4_quota_write+0x225/0x570 fs/ext4/super.c:7105\n write_blk fs/quota/quota_tree.c:64 [inline]\n get_free_dqblk+0x34a/0x6d0 fs/quota/quota_tree.c:130\n do_insert_tree+0x26b/0x1aa0 fs/quota/quota_tree.c:340\n do_insert_tree+0x722/0x1aa0 fs/quota/quota_tree.c:375\n do_insert_tree+0x722/0x1aa0 fs/quota/quota_tree.c:375\n do_insert_tree+0x722/0x1aa0 fs/quota/quota_tree.c:375\n dq_insert_tree fs/quota/quota_tree.c:401 [inline]\n qtree_write_dquot+0x3b6/0x530 fs/quota/quota_tree.c:420\n v2_write_dquot+0x11b/0x190 fs/quota/quota_v2.c:358\n dquot_acquire+0x348/0x670 fs/quota/dquot.c:444\n ext4_acquire_dquot+0x2dc/0x400 fs/ext4/super.c:6740\n dqget+0x999/0xdc0 fs/quota/dquot.c:914\n __dquot_initialize+0x3d0/0xcf0 fs/quota/dquot.c:1492\n ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329\n ext4_orphan_cleanup+0xb60/0x1340 fs/ext4/orphan.c:474\n __ext4_fill_super fs/ext4/super.c:5516 [inline]\n ext4_fill_super+0x81cd/0x8700 fs/ext4/super.c:5644\n get_tree_bdev+0x400/0x620 fs/super.c:1282\n vfs_get_tree+0x88/0x270 fs/super.c:1489\n do_new_mount+0x289/0xad0 fs/namespace.c:3145\n do_mount fs/namespace.c:3488 [inline]\n __do_sys_mount fs/namespace.c:3697 [inline]\n __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nAdd some debug information:\nmb_find_extent: mb_find_extent block=41, order=0 needed=64 next=0 ex=0/41/1@3735929054 64 64 7\nblock_bitmap: ff 3f 0c 00 fc 01 00 00 d2 3d 00 00 00 00 00 00 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n\nAcctually, blocks per group is 64, but block bitmap indicate at least has\n128 blocks. Now, ext4_validate_block_bitmap() didn\u0027t check invalid block\u0027s\nbitmap if set.\nTo resolve above issue, add check like fsck \"Padding at end of block bitmap is\nnot set\"."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-16T16:11:53.877Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/775b00ba23f6f916fe2ac60c5ff7fd0fe4f28d0d"
        },
        {
          "url": "https://git.kernel.org/stable/c/1b90fbc7590124c57a2e590de7fd07eba26606f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d356d902e9d5b1aaaaf2326d365340fa8a90c1b"
        },
        {
          "url": "https://git.kernel.org/stable/c/d55e76e11592a1d18a179c7fd34ca1b52632beb3"
        },
        {
          "url": "https://git.kernel.org/stable/c/dba62fa84a8eac44a53a2862de8a40e5bdfa0ae3"
        },
        {
          "url": "https://git.kernel.org/stable/c/e4d503c956a744cb59e509ca5f134cfad423c7a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/dd45e536f47a82e0a405f9a4b6c7ceb367171ee9"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa08a7b61dff8a4df11ff1e84abfc214b487caf7"
        }
      ],
      "title": "ext4: fix WARNING in mb_find_extent",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53317",
    "datePublished": "2025-09-16T16:11:53.877Z",
    "dateReserved": "2025-09-16T16:08:59.563Z",
    "dateUpdated": "2025-09-16T16:11:53.877Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53317\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-16T17:15:37.713\",\"lastModified\":\"2025-09-17T14:18:55.093\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix WARNING in mb_find_extent\\n\\nSyzbot found the following issue:\\n\\nEXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, O_DIRECT and fast_commit support!\\nEXT4-fs (loop0): orphan cleanup on readonly fs\\n------------[ cut here ]------------\\nWARNING: CPU: 1 PID: 5067 at fs/ext4/mballoc.c:1869 mb_find_extent+0x8a1/0xe30\\nModules linked in:\\nCPU: 1 PID: 5067 Comm: syz-executor307 Not tainted 6.2.0-rc1-syzkaller #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\\nRIP: 0010:mb_find_extent+0x8a1/0xe30 fs/ext4/mballoc.c:1869\\nRSP: 0018:ffffc90003c9e098 EFLAGS: 00010293\\nRAX: ffffffff82405731 RBX: 0000000000000041 RCX: ffff8880783457c0\\nRDX: 0000000000000000 RSI: 0000000000000041 RDI: 0000000000000040\\nRBP: 0000000000000040 R08: ffffffff82405723 R09: ffffed10053c9402\\nR10: ffffed10053c9402 R11: 1ffff110053c9401 R12: 0000000000000000\\nR13: ffffc90003c9e538 R14: dffffc0000000000 R15: ffffc90003c9e2cc\\nFS:  0000555556665300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 000056312f6796f8 CR3: 0000000022437000 CR4: 00000000003506e0\\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\nCall Trace:\\n \u003cTASK\u003e\\n ext4_mb_complex_scan_group+0x353/0x1100 fs/ext4/mballoc.c:2307\\n ext4_mb_regular_allocator+0x1533/0x3860 fs/ext4/mballoc.c:2735\\n ext4_mb_new_blocks+0xddf/0x3db0 fs/ext4/mballoc.c:5605\\n ext4_ext_map_blocks+0x1868/0x6880 fs/ext4/extents.c:4286\\n ext4_map_blocks+0xa49/0x1cc0 fs/ext4/inode.c:651\\n ext4_getblk+0x1b9/0x770 fs/ext4/inode.c:864\\n ext4_bread+0x2a/0x170 fs/ext4/inode.c:920\\n ext4_quota_write+0x225/0x570 fs/ext4/super.c:7105\\n write_blk fs/quota/quota_tree.c:64 [inline]\\n get_free_dqblk+0x34a/0x6d0 fs/quota/quota_tree.c:130\\n do_insert_tree+0x26b/0x1aa0 fs/quota/quota_tree.c:340\\n do_insert_tree+0x722/0x1aa0 fs/quota/quota_tree.c:375\\n do_insert_tree+0x722/0x1aa0 fs/quota/quota_tree.c:375\\n do_insert_tree+0x722/0x1aa0 fs/quota/quota_tree.c:375\\n dq_insert_tree fs/quota/quota_tree.c:401 [inline]\\n qtree_write_dquot+0x3b6/0x530 fs/quota/quota_tree.c:420\\n v2_write_dquot+0x11b/0x190 fs/quota/quota_v2.c:358\\n dquot_acquire+0x348/0x670 fs/quota/dquot.c:444\\n ext4_acquire_dquot+0x2dc/0x400 fs/ext4/super.c:6740\\n dqget+0x999/0xdc0 fs/quota/dquot.c:914\\n __dquot_initialize+0x3d0/0xcf0 fs/quota/dquot.c:1492\\n ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329\\n ext4_orphan_cleanup+0xb60/0x1340 fs/ext4/orphan.c:474\\n __ext4_fill_super fs/ext4/super.c:5516 [inline]\\n ext4_fill_super+0x81cd/0x8700 fs/ext4/super.c:5644\\n get_tree_bdev+0x400/0x620 fs/super.c:1282\\n vfs_get_tree+0x88/0x270 fs/super.c:1489\\n do_new_mount+0x289/0xad0 fs/namespace.c:3145\\n do_mount fs/namespace.c:3488 [inline]\\n __do_sys_mount fs/namespace.c:3697 [inline]\\n __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674\\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nAdd some debug information:\\nmb_find_extent: mb_find_extent block=41, order=0 needed=64 next=0 ex=0/41/1@3735929054 64 64 7\\nblock_bitmap: ff 3f 0c 00 fc 01 00 00 d2 3d 00 00 00 00 00 00 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\\n\\nAcctually, blocks per group is 64, but block bitmap indicate at least has\\n128 blocks. Now, ext4_validate_block_bitmap() didn\u0027t check invalid block\u0027s\\nbitmap if set.\\nTo resolve above issue, add check like fsck \\\"Padding at end of block bitmap is\\nnot set\\\".\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1b90fbc7590124c57a2e590de7fd07eba26606f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d356d902e9d5b1aaaaf2326d365340fa8a90c1b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/775b00ba23f6f916fe2ac60c5ff7fd0fe4f28d0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d55e76e11592a1d18a179c7fd34ca1b52632beb3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dba62fa84a8eac44a53a2862de8a40e5bdfa0ae3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dd45e536f47a82e0a405f9a4b6c7ceb367171ee9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e4d503c956a744cb59e509ca5f134cfad423c7a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fa08a7b61dff8a4df11ff1e84abfc214b487caf7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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