{"id":"CVE-2022-49879","title":"ext4: fix BUG_ON() when directory entry has invalid rec_len","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix BUG_ON() when directory entry has invalid rec_len\n\nThe rec_len field in the directory entry has to be a multiple of 4.  A\ncorrupted filesystem image can be us…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < 2fa24d0274fbf913b56ee31f15bc01168669d909","Linux >= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < 156451a67b93986fb07c274ef6995ff40766c5ad","Linux >= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < 999cff2b6ce3b45c08abf793bf55534777421327","Linux >= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < ce1ee2c8827fb6493e91acbd50f664cf2a972c3d","Linux >= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < 17a0bc9bd697f75cfdf9b378d5eb2d7409c91340","Linux 2.6.30"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T19:51:06.646371Z"},"published":"2025-05-01","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:00:10.635Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-49879","references":[{"url":"https://git.kernel.org/stable/c/2fa24d0274fbf913b56ee31f15bc01168669d909"},{"url":"https://git.kernel.org/stable/c/156451a67b93986fb07c274ef6995ff40766c5ad"},{"url":"https://git.kernel.org/stable/c/999cff2b6ce3b45c08abf793bf55534777421327"},{"url":"https://git.kernel.org/stable/c/ce1ee2c8827fb6493e91acbd50f664cf2a972c3d"},{"url":"https://git.kernel.org/stable/c/17a0bc9bd697f75cfdf9b378d5eb2d7409c91340"}],"tags":["cve.org"],"epss":0.00218,"epssPercentile":0.12384,"ingestedAt":"2026-11-05T22:38:31.622Z","slug":"CVE-2022-49879","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\next4: fix BUG_ON() when directory entry has invalid rec_len\n\nThe rec_len field in the directory entry has to be a multiple of 4.  A\ncorrupted filesystem image can be used to hit a BUG() in\next4_rec_len_to_disk(), called from make_indexed_dir().\n\n ------------[ cut here ]------------\n kernel BUG at fs/ext4/ext4.h:2413!\n ...\n RIP: 0010:make_indexed_dir+0x53f/0x5f0\n ...\n Call Trace:\n  <TASK>\n  ? add_dirent_to_buf+0x1b2/0x200\n  ext4_add_entry+0x36e/0x480\n  ext4_add_nondir+0x2b/0xc0\n  ext4_create+0x163/0x200\n  path_openat+0x635/0xe90\n  do_filp_open+0xb4/0x160\n  ? __create_object.isra.0+0x1de/0x3b0\n  ? _raw_spin_unlock+0x12/0x30\n  do_sys_openat2+0x91/0x150\n  __x64_sys_open+0x6c/0xa0\n  do_syscall_64+0x3c/0x80\n  entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThe fix simply adds a call to ext4_check_dir_entry() to validate the\ndirectory entry, returning -EFSCORRUPTED if the entry is invalid.\n\n## Affected\n\n- `Linux >= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < 2fa24d0274fbf913b56ee31f15bc01168669d909`\n- `Linux >= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < 156451a67b93986fb07c274ef6995ff40766c5ad`\n- `Linux >= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < 999cff2b6ce3b45c08abf793bf55534777421327`\n- `Linux >= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < ce1ee2c8827fb6493e91acbd50f664cf2a972c3d`\n- `Linux >= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < 17a0bc9bd697f75cfdf9b378d5eb2d7409c91340`\n- `Linux 2.6.30`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}