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

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.

Timeline

Scores

EPSS (exploitation in 30 days)

0.24% · top 84% of all CVEs (12 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

• Linux · Linux

  • affected 28c7bac0091687e6116ebd6c179e154ae4053c90 – < cd1f93ca97a9136989f3bd2bf90696732a2ed644
  • affected 28c7bac0091687e6116ebd6c179e154ae4053c90 – < b183fe8702e78bba3dcef8e7193cab6898abee07
  • affected 28c7bac0091687e6116ebd6c179e154ae4053c90 – < cfbbb3199e71b63fc26cee0ebff327c47128a1e8
  • affected 28c7bac0091687e6116ebd6c179e154ae4053c90 – < d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90
  • affected 28c7bac0091687e6116ebd6c179e154ae4053c90 – < 6d2cbf517dcabc093159cf138ad5712c9c7fa954
  • affected 28c7bac0091687e6116ebd6c179e154ae4053c90 – < 8b1413dbfe49646eda2c00c0f1144ee9d3368e0c
  • affected 28c7bac0091687e6116ebd6c179e154ae4053c90 – < dc3e0f55bec4410f3d74352c4a7c79f518088ee2
  • affected 28c7bac0091687e6116ebd6c179e154ae4053c90 – < 5d1935ac02ca5aee364a449a35e2977ea84509b0

• Linux · Linux

  • affected 3.3
  • unaffected < 3.3
  • unaffected 4.19.307 – ≤ 4.19.*
  • unaffected 5.4.269 – ≤ 5.4.*
  • unaffected 5.10.210 – ≤ 5.10.*
  • unaffected 5.15.149 – ≤ 5.15.*
  • unaffected 6.1.77 – ≤ 6.1.*
  • unaffected 6.6.16 – ≤ 6.6.*
  • unaffected 6.7.4 – ≤ 6.7.*
  • unaffected 6.8 – ≤ *

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2023-57246 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2023-52622](https://cveledger.app/badge/CVE-2023-52622.svg)](https://cveledger.app/cve/CVE-2023-52622)

Record last updated 15 Oct 2026, 00:17 UTC.