CVE-2022-49879

Summary

In the Linux kernel, the following vulnerability has been resolved: ext4: fix BUG_ON() when directory entry has invalid rec_len The rec_len field in the directory entry has to be a multiple of 4. A corrupted filesystem image can be used to hit a BUG() in ext4_rec_len_to_disk(), called from make_indexed_dir(). ------------[ cut here ]------------ kernel BUG at fs/ext4/ext4.h:2413! ... RIP: 0010:make_indexed_dir+0x53f/0x5f0 ... Call Trace: <TASK> ? add_dirent_to_buf+0x1b2/0x200 ext4_add_entry+0x36e/0x480 ext4_add_nondir+0x2b/0xc0 ext4_create+0x163/0x200 path_openat+0x635/0xe90 do_filp_open+0xb4/0x160 ? __create_object.isra.0+0x1de/0x3b0 ? _raw_spin_unlock+0x12/0x30 do_sys_openat2+0x91/0x150 __x64_sys_open+0x6c/0xa0 do_syscall_64+0x3c/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The fix simply adds a call to ext4_check_dir_entry() to validate the directory entry, returning -EFSCORRUPTED if the entry is invalid.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/156451a67b93986fb07c274ef6995ff40766c5ad ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/156451a67b93986fb07c274ef6995ff40766c5adPatch
• https://git.kernel.org/stable/c/17a0bc9bd697f75cfdf9b378d5eb2d7409c91340Patch
• https://git.kernel.org/stable/c/2fa24d0274fbf913b56ee31f15bc01168669d909Patch
• https://git.kernel.org/stable/c/999cff2b6ce3b45c08abf793bf55534777421327Patch
• https://git.kernel.org/stable/c/ce1ee2c8827fb6493e91acbd50f664cf2a972c3dPatch