{"cve":"CVE-2022-49170","nvd":{"published":"2025-02-26T07:00:54.110","modified":"2026-08-13T00:17:30.040","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on curseg->alloc_type\n\nAs Wenqing Liu reported in bugzilla:\n\nhttps://bugzilla.kernel.org/show_bug.cgi?id=215657\n\n- Overview\nUBSAN: array-index-out-of-bounds in fs/f2fs/segment.c:3460:2 when mount and operate a corrupted image\n\n- Reproduce\ntested on kernel 5.17-rc4, 5.17-rc6\n\n1. mkdir test_crash\n2. cd test_crash\n3. unzip tmp2.zip\n4. mkdir mnt\n5. ./single_test.sh f2fs 2\n\n- Kernel dump\n[   46.434454] loop0: detected capacity change from 0 to 131072\n[   46.529839] F2FS-fs (loop0): Mounted with checkpoint version = 7548c2d9\n[   46.738319] ================================================================================\n[   46.738412] UBSAN: array-index-out-of-bounds in fs/f2fs/segment.c:3460:2\n[   46.738475] index 231 is out of range for type 'unsigned int [2]'\n[   46.738539] CPU: 2 PID: 939 Comm: umount Not tainted 5.17.0-rc6 #1\n[   46.738547] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014\n[   46.738551] Call Trace:\n[   46.738556]  <TASK>\n[   46.738563]  dump_stack_lvl+0x47/0x5c\n[   46.738581]  ubsan_epilogue+0x5/0x50\n[   46.738592]  __ubsan_handle_out_of_bounds+0x68/0x80\n[   46.738604]  f2fs_allocate_data_block+0xdff/0xe60 [f2fs]\n[   46.738819]  do_write_page+0xef/0x210 [f2fs]\n[   46.738934]  f2fs_do_write_node_page+0x3f/0x80 [f2fs]\n[   46.739038]  __write_node_page+0x2b7/0x920 [f2fs]\n[   46.739162]  f2fs_sync_node_pages+0x943/0xb00 [f2fs]\n[   46.739293]  f2fs_write_checkpoint+0x7bb/0x1030 [f2fs]\n[   46.739405]  kill_f2fs_super+0x125/0x150 [f2fs]\n[   46.739507]  deactivate_locked_super+0x60/0xc0\n[   46.739517]  deactivate_super+0x70/0xb0\n[   46.739524]  cleanup_mnt+0x11a/0x200\n[   46.739532]  __cleanup_mnt+0x16/0x20\n[   46.739538]  task_work_run+0x67/0xa0\n[   46.739547]  exit_to_user_mode_prepare+0x18c/0x1a0\n[   46.739559]  syscall_exit_to_user_mode+0x26/0x40\n[   46.739568]  do_syscall_64+0x46/0xb0\n[   46.739584]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nThe root cause is we missed to do sanity check on curseg->alloc_type,\nresult in out-of-bound accessing on sbi->block_count[] array, fix it.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-129"],"references":["https://git.kernel.org/stable/c/0748a0f7dcb9d9dddc80302d73ebcecef6782ef0","https://git.kernel.org/stable/c/498b7088db71f9707359448cd6800bbb1882f4c3","https://git.kernel.org/stable/c/c12765e3f129b144421c80d3383df885f85ee290","https://git.kernel.org/stable/c/f41ee8b91c00770d718be2ff4852a80017ae9ab3","https://git.kernel.org/stable/c/f68caedf264a95c0b02dfd0d9f92ac2637d5848a"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:59:48.811064707+00:00"},"epss":{"cve":"CVE-2022-49170","score":0.00283,"percentile":0.20866,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}