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🛡️ CVE-2023-52622 — debian-linux

🟡 CVSS 5.5 — Medium ✅ No Known Exploit CWE-770 NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

ext4: avoid online resizing failures due to oversized flex bg

In the Linux kernel, the following vulnerability has been resolved:

ext4: avoid online resizing failures due to oversized flex bg

When we online resize an ext4 filesystem with a oversized flexbg_size,

mkfs.ext4 -F -G 67108864 $dev -b 4096 100M

mount $dev $dir

resize2fs $dev 16G

the following WARN_ON is triggered:

==================================================================

WARNING: CPU: 0 PID: 427 at mm/page_alloc.c:4402 __alloc_pages+0x411/0x550

Modules linked in: sg(E)

CPU: 0 PID: 427 Comm: resize2fs Tainted: G E 6.6.0-rc5+ #314

RIP: 0010:__alloc_pages+0x411/0x550

Call Trace:

<TASK>

__kmalloc_large_node+0xa2/0x200

__kmalloc+0x16e/0x290

ext4_resize_fs+0x481/0xd80

__ext4_ioctl+0x1616/0x1d90

ext4_ioctl+0x12/0x20

__x64_sys_ioctl+0xf0/0x150

do_syscall_64+0x3b/0x90

==================================================================

This is because flexbg_size is too large and the size of the new_group_data

array to be allocated exceeds MAX_ORDER. Currently, the minimum value of

MAX_ORDER is 8, the minimum value of PAGE_SIZE is 4096, the corresponding

maximum number of groups that can be allocated is:

(PAGE_SIZE << MAX_ORDER) / sizeof(struct ext4_new_group_data) ≈ 21845

And the value that is down-aligned to the power of 2 is 16384. Therefore,

this value is defined as MAX_RESIZE_BG, and the number of groups added

each time does not exceed this value during resizing, and is added multiple

times to complete the online resizing. The difference is that the metadata

in a flex_bg may be more dispersed.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2023-52622 is classified as CWE-770: Allocation of Resources Without Limits. Resources are allocated on request with no cap, so a client can exhaust them.

Affected software

CVE-2023-52622 is recorded against 3 packages.

  • debian-linux
  • kernel (from 6.7.0 up to 6.7.4)
  • linux-kernel (from 6.7 up to 6.7.4)

Timeline and source

Published on 26 March 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
lists.debian.org
lists.debian.org

Other advisories for this package

debian-linux has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-770: Allocation of Resources Without Limits) in other software:

CVE-2023-52622 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE CWE-770
Public Exploit ✅ No
Source NVD
Published 2024-03-26
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
debian-linux — —
kernel 6.7.0 6.7.4
linux-kernel 6.7 6.7.4

References

Similar Threats

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