{"id":"CVE-2025-37806","summary":"fs/ntfs3: Keep write operations atomic","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: Keep write operations atomic\n\nsyzbot reported a NULL pointer dereference in __generic_file_write_iter. [1]\n\nBefore the write operation is completed, the user executes ioctl[2] to clear\nthe compress flag of the file, which causes the is_compressed() judgment to\nreturn 0, further causing the program to enter the wrong process and call the\nwrong ops ntfs_aops_cmpr, which triggers the null pointer dereference of\nwrite_begin.\n\nUse inode lock to synchronize ioctl and write to avoid this case.\n\n[1]\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000000\nMem abort info:\n  ESR = 0x0000000086000006\n  EC = 0x21: IABT (current EL), IL = 32 bits\n  SET = 0, FnV = 0\n  EA = 0, S1PTW = 0\n  FSC = 0x06: level 2 translation fault\nuser pgtable: 4k pages, 48-bit VAs, pgdp=000000011896d000\n[0000000000000000] pgd=0800000118b44403, p4d=0800000118b44403, pud=0800000117517403, pmd=0000000000000000\nInternal error: Oops: 0000000086000006 [#1] PREEMPT SMP\nModules linked in:\nCPU: 0 UID: 0 PID: 6427 Comm: syz-executor347 Not tainted 6.13.0-rc3-syzkaller-g573067a5a685 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\npstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : 0x0\nlr : generic_perform_write+0x29c/0x868 mm/filemap.c:4055\nsp : ffff80009d4978a0\nx29: ffff80009d4979c0 x28: dfff800000000000 x27: ffff80009d497bc8\nx26: 0000000000000000 x25: ffff80009d497960 x24: ffff80008ba71c68\nx23: 0000000000000000 x22: ffff0000c655dac0 x21: 0000000000001000\nx20: 000000000000000c x19: 1ffff00013a92f2c x18: ffff0000e183aa1c\nx17: 0004060000000014 x16: ffff800083275834 x15: 0000000000000001\nx14: 0000000000000000 x13: 0000000000000001 x12: ffff0000c655dac0\nx11: 0000000000ff0100 x10: 0000000000ff0100 x9 : 0000000000000000\nx8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000\nx5 : ffff80009d497980 x4 : ffff80009d497960 x3 : 0000000000001000\nx2 : 0000000000000000 x1 : ffff0000e183a928 x0 : ffff0000d60b0fc0\nCall trace:\n 0x0 (P)\n __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4156\n ntfs_file_write_iter+0x54c/0x630 fs/ntfs3/file.c:1267\n new_sync_write fs/read_write.c:586 [inline]\n vfs_write+0x920/0xcf4 fs/read_write.c:679\n ksys_write+0x15c/0x26c fs/read_write.c:731\n __do_sys_write fs/read_write.c:742 [inline]\n __se_sys_write fs/read_write.c:739 [inline]\n __arm64_sys_write+0x7c/0x90 fs/read_write.c:739\n __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\n invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49\n el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132\n do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151\n el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744\n el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762\n\n[2]\nioctl$FS_IOC_SETFLAGS(r0, 0x40086602, &(0x7f00000000c0)=0x20)","modified":"2026-05-18T05:57:28.104028040Z","published":"2025-05-08T06:26:05.689Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37806.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/285cec318bf5a7a6c8ba999b2b6ec96f9a20590f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/464139e18f619aa14fb921a61721862f43421c54"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8db49e89a7f8b48ee59fa9ad32b6ed0879747df8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37806.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-37806"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4534a70b7056fd4b9a1c6db5a4ce3c98546b291e"},{"fixed":"8db49e89a7f8b48ee59fa9ad32b6ed0879747df8"},{"fixed":"464139e18f619aa14fb921a61721862f43421c54"},{"fixed":"285cec318bf5a7a6c8ba999b2b6ec96f9a20590f"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-37806.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"6.12.26"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.14.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-37806.json"}}],"schema_version":"1.7.5"}