CVE-2026-31452

HIGH EPSS 2.9%
Published Apr 22, 20262mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Apr 22, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: convert inline data to extents when truncate exceeds inline size Add a check in ext4_setattr() to convert files from inline data storage to extent-based storage when truncate() grows the file size beyond the inline capacity. This prevents the filesystem from entering an inconsistent state where the inline data flag is set but the file size exceeds what can be stored inline. Without this fix, the following sequence causes a kernel BUG_ON(): 1. Mount filesystem with inode that has inline flag set and small size 2. truncate(file, 50MB) - grows size but inline flag remains set 3. sendfile() attempts to write data 4. ext4_write_inline_data() hits BUG_ON(write_size > inline_capacity) The crash occurs because ext4_write_inline_data() expects inline storage to accommodate the write, but the actual inline capacity (~60 bytes for i_block + ~96 bytes for xattrs) is far smaller than the file size and write request. The fix checks if the new size from setattr exceeds the inode's actual inline capacity (EXT4_I(inode)->i_inline_size) and converts the file to extent-based storage before proceeding with the size change. This addresses the root cause by ensuring the inline data flag and file size remain consistent during truncate operations.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
2.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 12

VendorProductVersionRange
linuxlinux_kernel*≥3.8  –  <5.10.253
linuxlinux_kernel*≥5.11  –  <5.15.203
linuxlinux_kernel*≥5.16  –  <6.1.168
linuxlinux_kernel*≥6.2  –  <6.6.131
linuxlinux_kernel*≥6.7  –  <6.12.80
linuxlinux_kernel*≥6.13  –  <6.18.21
linuxlinux_kernel*≥6.19  –  <6.19.11
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/07c1a31af18290054da3d18221b8bf58983c5d3a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/110d7ef602659ce4d7947c5480f7ca2779696aaf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/699bac4d4c951974d55b045c983d1de777215949
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7920dcc571cef3d8aa9ee109c136125d61d41669
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/93cb2d103e5c707de0f7ad58a39b7f0fddc27aa6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c047332be7195833a5c5126816c2502df8269fe4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ed9356a30e59c7cc3198e7fc46cfedf3767b9b17
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f53a5d9f32924bc2a810d2df243b7714da58b636
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/07c1a31af18290054da3d18221b8bf58983c5d3a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/110d7ef602659ce4d7947c5480f7ca2779696aaf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/699bac4d4c951974d55b045c983d1de777215949
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7920dcc571cef3d8aa9ee109c136125d61d41669
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/93cb2d103e5c707de0f7ad58a39b7f0fddc27aa6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c047332be7195833a5c5126816c2502df8269fe4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ed9356a30e59c7cc3198e7fc46cfedf3767b9b17
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f53a5d9f32924bc2a810d2df243b7714da58b636
    Patch