CVE-2022-49708

MEDIUM EPSS 18.5%
Published Feb 26, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Feb 26, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug_on ext4_mb_use_inode_pa Hulk Robot reported a BUG_ON: ================================================================== kernel BUG at fs/ext4/mballoc.c:3211! [...] RIP: 0010:ext4_mb_mark_diskspace_used.cold+0x85/0x136f [...] Call Trace: ext4_mb_new_blocks+0x9df/0x5d30 ext4_ext_map_blocks+0x1803/0x4d80 ext4_map_blocks+0x3a4/0x1a10 ext4_writepages+0x126d/0x2c30 do_writepages+0x7f/0x1b0 __filemap_fdatawrite_range+0x285/0x3b0 file_write_and_wait_range+0xb1/0x140 ext4_sync_file+0x1aa/0xca0 vfs_fsync_range+0xfb/0x260 do_fsync+0x48/0xa0 [...] ================================================================== Above issue may happen as follows: ------------------------------------- do_fsync vfs_fsync_range ext4_sync_file file_write_and_wait_range __filemap_fdatawrite_range do_writepages ext4_writepages mpage_map_and_submit_extent mpage_map_one_extent ext4_map_blocks ext4_mb_new_blocks ext4_mb_normalize_request >>> start + size <= ac->ac_o_ex.fe_logical ext4_mb_regular_allocator ext4_mb_simple_scan_group ext4_mb_use_best_found ext4_mb_new_preallocation ext4_mb_new_inode_pa ext4_mb_use_inode_pa >>> set ac->ac_b_ex.fe_len <= 0 ext4_mb_mark_diskspace_used >>> BUG_ON(ac->ac_b_ex.fe_len <= 0); we can easily reproduce this problem with the following commands: `fallocate -l100M disk` `mkfs.ext4 -b 1024 -g 256 disk` `mount disk /mnt` `fsstress -d /mnt -l 0 -n 1000 -p 1` The size must be smaller than or equal to EXT4_BLOCKS_PER_GROUP. Therefore, "start + size <= ac->ac_o_ex.fe_logical" may occur when the size is truncated. So start should be the start position of the group where ac_o_ex.fe_logical is located after alignment. In addition, when the value of fe_logical or EXT4_BLOCKS_PER_GROUP is very large, the value calculated by start_off is more accurate.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
18.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-617

Affected Products 15

VendorProductVersionRange
linuxlinux_kernel*≥3.2.89  –  <3.3
linuxlinux_kernel*≥3.10.107  –  <3.11
linuxlinux_kernel*≥3.12.72  –  <3.13
linuxlinux_kernel*≥3.16.44  –  <3.17
linuxlinux_kernel*≥4.1.40  –  <4.2
linuxlinux_kernel*≥4.4.53  –  <4.5
linuxlinux_kernel*≥4.9.14  –  <4.9.320
linuxlinux_kernel*≥4.10.2  –  <4.14.285
linuxlinux_kernel*≥4.15  –  <4.19.249
linuxlinux_kernel*≥4.20  –  <5.4.200
linuxlinux_kernel*≥5.5  –  <5.10.124
linuxlinux_kernel*≥5.11  –  <5.15.49
linuxlinux_kernel*≥5.16  –  <5.18.6
linuxlinux_kernel5.19any
linuxlinux_kernel5.19any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/5707d721d1819db57dba57b1d4623034fcb32047
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6880fb2e64331b9fdc85d3f32b1d7e81ad8703f1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6fdaf31ad5f3d3afab744dfd9a8b0d9142aa881f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/887a3e9ad4b8309a2266bce7ae749b2bf1f7a687
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/90f0f9d45dff0128c0fca0d2358c4153b024afa6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a08f789d2ab5242c07e716baf9a835725046be89
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a37c1359714da42517dd19d36fc3c4d17edba832
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a6b31616e5afe1d3972cb0682a373e50597faf5c
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/5707d721d1819db57dba57b1d4623034fcb32047
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6880fb2e64331b9fdc85d3f32b1d7e81ad8703f1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6fdaf31ad5f3d3afab744dfd9a8b0d9142aa881f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/887a3e9ad4b8309a2266bce7ae749b2bf1f7a687
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/90f0f9d45dff0128c0fca0d2358c4153b024afa6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a08f789d2ab5242c07e716baf9a835725046be89
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a37c1359714da42517dd19d36fc3c4d17edba832
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a6b31616e5afe1d3972cb0682a373e50597faf5c
    Patch