{ "cveId": "CVE-2023-52737", "url": "https://patchblox.com/security/cve/CVE-2023-52737", "summary": "CVE-2023-52737 is fixed in 20 products on 1 platform, first by ALAS2023-2023-127, released March 11, 2023. It is not reported as exploited. Patch Radar priority: Routine.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: btrfs: lock the inode in shared mode before star...", "description": "In the Linux kernel, the following vulnerability has been resolved: btrfs: lock the inode in shared mode before starting fiemap Currently fiemap does not take the inode\u0027s lock (VFS lock), it only locks a file range in the inode\u0027s io tree. This however can lead to a deadlock if we have a concurrent fsync on the file and fiemap code triggers a fault when accessing the user space buffer with fiemap_fill_next_extent(). The deadlock happens on the inode\u0027s i_mmap_lock semaphore, which is taken both by fsync and btrfs_page_mkwrite(). This deadlock was recently reported by syzbot and triggers a trace like the following: task:syz-executor361 state:D stack:20264 pid:5668 ppid:5119 flags:0x00004004 Call Trace: \u003CTASK\u003E context_switch kernel/sched/core.c:5293 [inline] __schedule\u002B0x995/0xe20 kernel/sched/core.c:6606 schedule\u002B0xcb/0x190 kernel/sched/core.c:6682 wait_on_state fs/btrfs/extent-io-tree.c:707 [inline] wait_extent_bit\u002B0x577/0x6f0 fs/btrfs/extent-io-tree.c:751 lock_extent\u002B0x1c2/0x280 fs/btrfs/extent-io-tree.c:1742 find_lock_delalloc_range\u002B0x4e6/0x9c0 fs/btrfs/extent_io.c:488 writepage_delalloc\u002B0x1ef/0x540 fs/btrfs/extent_io.c:1863 __extent_writepage\u002B0x736/0x14e0 fs/btrfs/extent_io.c:2174 extent_write_cache_pages\u002B0x983/0x1220 fs/btrfs/extent_io.c:3091 extent_writepages\u002B0x219/0x540 fs/btrfs/extent_io.c:3211 do_writepages\u002B0x3c3/0x680 mm/page-writeback.c:2581 filemap_fdatawrite_wbc\u002B0x11e/0x170 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] filemap_fdatawrite_range\u002B0x175/0x200 mm/filemap.c:439 btrfs_fdatawrite_range fs/btrfs/file.c:3850 [inline] start_ordered_ops fs/btrfs/file.c:1737 [inline] btrfs_sync_file\u002B0x4ff/0x1190 fs/btrfs/file.c:1839 generic_write_sync include/linux/fs.h:2885 [inline] btrfs_do_write_iter\u002B0xcd3/0x1280 fs/btrfs/file.c:1684 call_write_iter include/linux/fs.h:2189 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write\u002B0x7dc/0xc50 fs/read_write.c:584 ksys_write\u002B0x177/0x2a0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64\u002B0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe\u002B0x63/0xcd RIP: 0033:0x7f7d4054e9b9 RSP: 002b:00007f7d404fa2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f7d405d87a0 RCX: 00007f7d4054e9b9 RDX: 0000000000000090 RSI: 0000000020000000 RDI: 0000000000000006 RBP: 00007f7d405a51d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 61635f65646f6e69 R13: 65646f7475616f6e R14: 7261637369646f6e R15: 00007f7d405d87a8 \u003C/TASK\u003E INFO: task syz-executor361:5697 blocked for more than 145 seconds. Not tainted 6.2.0-rc3-syzkaller-00376-g7c6984405241 #0 \u0022echo 0 \u003E /proc/sys/kernel/hung_task_timeout_secs\u0022 disables this message. task:syz-executor361 state:D stack:21216 pid:5697 ppid:5119 flags:0x00004004 Call Trace: \u003CTASK\u003E context_switch kernel/sched/core.c:5293 [inline] __schedule\u002B0x995/0xe20 kernel/sched/core.c:6606 schedule\u002B0xcb/0x190 kernel/sched/core.c:6682 rwsem_down_read_slowpath\u002B0x5f9/0x930 kernel/locking/rwsem.c:1095 __down_read_common\u002B0x54/0x2a0 kernel/locking/rwsem.c:1260 btrfs_page_mkwrite\u002B0x417/0xc80 fs/btrfs/inode.c:8526 do_page_mkwrite\u002B0x19e/0x5e0 mm/memory.c:2947 wp_page_shared\u002B0x15e/0x380 mm/memory.c:3295 handle_pte_fault mm/memory.c:4949 [inline] __handle_mm_fault mm/memory.c:5073 [inline] handle_mm_fault\u002B0x1b79/0x26b0 mm/memory.c:5219 do_user_addr_fault\u002B0x69b/0xcb0 arch/x86/mm/fault.c:1428 handle_page_fault arch/x86/mm/fault.c:1519 [inline] exc_page_fault\u002B0x7a/0x110 arch/x86/mm/fault.c:1575 asm_exc_page_fault\u002B0x22/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:copy_user_short_string\u002B0xd/0x40 arch/x86/lib/copy_user_64.S:233 Code: 74 0a 89 (...) RSP: 0018:ffffc9000570f330 EFLAGS: 000502 ---truncated---", "published": "2023-03-11T01:10:00Z", "severity": "medium", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.00212, "epssPercentile": 0.11557, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "bpftool", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "bpftool-debuginfo", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "kernel", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "kernel-debuginfo", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "kernel-debuginfo-common-aarch64", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "kernel-debuginfo-common-x86_64", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "kernel-devel", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "kernel-headers", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "kernel-libbpf", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "kernel-libbpf-devel", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "kernel-libbpf-static", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "kernel-livepatch-6.1.15-28.43", "release": "amzn 2023", "fixedVersion": "1.0-0.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "kernel-tools", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "kernel-tools-debuginfo", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "kernel-tools-devel", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "linux", "release": "Debian 12.15 (bookworm)", "fixedVersion": "6.1.15-1", "fix": "DEBIAN-CVE-2023-52737", "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-52737", "released": "2024-05-21T16:15:13Z" }, { "platform": "linux", "product": "linux", "release": "Debian 13.5 (trixie)", "fixedVersion": "6.1.15-1", "fix": "DEBIAN-CVE-2023-52737", "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-52737", "released": "2024-05-21T16:15:13Z" }, { "platform": "linux", "product": "linux", "release": "Debian 14", "fixedVersion": "6.1.15-1", "fix": "DEBIAN-CVE-2023-52737", "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-52737", "released": "2024-05-21T16:15:13Z" }, { "platform": "linux", "product": "perf", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "perf-debuginfo", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "python3-perf", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" }, { "platform": "linux", "product": "python3-perf-debuginfo", "release": "amzn 2023", "fixedVersion": "6.1.15-28.43.amzn2023", "fix": "ALAS2023-2023-127", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-127", "released": "2023-03-11T01:10:00Z" } ], "noFixYet": [], "dataAsOf": "2026-11-09T13:31:49Z", "attribution": { "text": "Data: Patchblox Patch Radar", "url": "https://patchblox.com/security/patch-radar", "terms": "https://patchblox.com/security/patch-radar/use-the-data" } }