5.5

CVE-2023-52622: ext4: avoid online resizing failures due to oversized flex bg

Modified
AliasesUBUNTU-CVE-2023-52622DEBIAN-CVE-2023-52622
Published 26-03-2024Last modified 15-10-2026

Vulnerability summary

CVE-2023-52622 is a medium (CVSS 5.5) vulnerability in debian debian_linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 31 · Related 27
DLA-3840-1DLA-3842-1DSA-5681-1RHSA-2024:5101RHSA-2024:5102RHSA-2024:9315

Timeline

  1. 26-03-2024
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu117 products
  • linuxAll versions (No fix recorded) | < 5.4.0-181.201 | < 5.15.0-106.116
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1124.134 | < 5.15.0-1061.67
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
Linux2 products
  • linux≥ 28c7bac0091687e6116ebd6c179e154ae4053c90, < cd1f93ca97a9136989f3bd2bf90696732a2ed644 | ≥ 28c7bac0091687e6116ebd6c179e154ae4053c90, < b183fe8702e78bba3dcef8e7193cab6898abee07 | ≥ 28c7bac0091687e6116ebd6c179e154ae4053c90, < cfbbb3199e71b63fc26cee0ebff327c47128a1e8 | ≥ 28c7bac0091687e6116ebd6c179e154ae4053c90, < d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90 | ≥ 28c7bac0091687e6116ebd6c179e154ae4053c90, < 6d2cbf517dcabc093159cf138ad5712c9c7fa954 | ≥ 28c7bac0091687e6116ebd6c179e154ae4053c90, < 8b1413dbfe49646eda2c00c0f1144ee9d3368e0c | ≥ 28c7bac0091687e6116ebd6c179e154ae4053c90, < dc3e0f55bec4410f3d74352c4a7c79f518088ee2 | ≥ 28c7bac0091687e6116ebd6c179e154ae4053c90, < 5d1935ac02ca5aee364a449a35e2977ea84509b0 | 3.3
  • linux_kernel< 4.19.307 | ≥ 4.20, < 5.4.269 | ≥ 5.5, < 5.10.210 | ≥ 5.11, < 5.15.149 | ≥ 5.16, < 6.1.77 | ≥ 6.2, < 6.6.16 | ≥ 6.7, < 6.7.4

3 vendors · 121 products

References

31 links
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