CVE-2022-49879

published 2025-05-01

CVE-2022-49879: 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…

Priority P4 19 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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:

? 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.

Affected

16 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.0.8-1 (bookworm)	linux 6.0.8-1 (bookworm)
linux	linux	—	—
linux	linux	>= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < 2fa24d0274fbf913b56ee31f15bc01168669d909	2fa24d0274fbf913b56ee31f15bc01168669d909
linux	linux	>= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < 156451a67b93986fb07c274ef6995ff40766c5ad	156451a67b93986fb07c274ef6995ff40766c5ad
linux	linux	>= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < 999cff2b6ce3b45c08abf793bf55534777421327	999cff2b6ce3b45c08abf793bf55534777421327
linux	linux	>= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < ce1ee2c8827fb6493e91acbd50f664cf2a972c3d	ce1ee2c8827fb6493e91acbd50f664cf2a972c3d
linux	linux	>= 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 < 17a0bc9bd697f75cfdf9b378d5eb2d7409c91340	17a0bc9bd697f75cfdf9b378d5eb2d7409c91340
linux	linux_kernel	< 5.4.224	5.4.224
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.158-1	5.10.158-1
linux	linux_kernel	>= 0 < 6.0.8-1	6.0.8-1
linux	linux_kernel	>= 0 < 6.0.8-1	6.0.8-1
linux	linux_kernel	>= 0 < 6.0.8-1	6.0.8-1
linux	linux_kernel	>= 5.11 < 5.15.78	5.15.78
linux	linux_kernel	>= 5.16 < 6.0.8	6.0.8
linux	linux_kernel	>= 5.5 < 5.10.154	5.10.154

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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