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CVE-2026-31452— ext4: convert inline data to extents when truncate exceeds inline size

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ext4_setattr函数在截断操作超出内联容量时未将内联数据转换为扩展存储，可能导致文件系统状态不一致和内核BUG_ON。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.14% · P3

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 67cf5b09a46f72e048501b84996f2f77bc42e947< 110d7ef602659ce4d7947c5480f7ca2779696aaf affected
67cf5b09a46f72e048501b84996f2f77bc42e947< f53a5d9f32924bc2a810d2df243b7714da58b636 affected
67cf5b09a46f72e048501b84996f2f77bc42e947< c047332be7195833a5c5126816c2502df8269fe4 affected
67cf5b09a46f72e048501b84996f2f77bc42e947< 699bac4d4c951974d55b045c983d1de777215949 affected
67cf5b09a46f72e048501b84996f2f77bc42e947< 7920dcc571cef3d8aa9ee109c136125d61d41669 affected
67cf5b09a46f72e048501b84996f2f77bc42e947< 93cb2d103e5c707de0f7ad58a39b7f0fddc27aa6 affected
67cf5b09a46f72e048501b84996f2f77bc42e947< 07c1a31af18290054da3d18221b8bf58983c5d3a affected
67cf5b09a46f72e048501b84996f2f77bc42e947< ed9356a30e59c7cc3198e7fc46cfedf3767b9b17 affected
… +10 more rows
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I. Basic Information for CVE-2026-31452

Vulnerability Information
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Vulnerability Title
ext4: convert inline data to extents when truncate exceeds inline size
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ext4_setattr函数在截断操作超出内联容量时未将内联数据转换为扩展存储，可能导致文件系统状态不一致和内核BUG_ON。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 67cf5b09a46f72e048501b84996f2f77bc42e947 ~ 110d7ef602659ce4d7947c5480f7ca2779696aaf -
Linux Linux 3.8 -

II. Public POCs for CVE-2026-31452

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III. Intelligence Information for CVE-2026-31452

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Same Patch Batch · Linux · 2026-04-22 · 100 CVEs total

CVE-2026-31478 9.8 CRITICAL ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
CVE-2026-31463 9.8 CRITICAL iomap: fix invalid folio access when i_blkbits differs from I/O granularity
CVE-2026-31444 9.8 CRITICAL ksmbd: fix use-after-free and NULL deref in smb_grant_oplock()
CVE-2026-31436 9.8 CRITICAL dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()
CVE-2026-31501 9.8 CRITICAL net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path
CVE-2026-31448 9.4 CRITICAL ext4: avoid infinite loops caused by residual data
CVE-2026-31450 8.8 HIGH ext4: publish jinode after initialization
CVE-2026-31432 8.8 HIGH ksmbd: fix OOB write in QUERY_INFO for compound requests
CVE-2026-31433 8.8 HIGH ksmbd: fix potencial OOB in get_file_all_info() for compound requests
CVE-2026-31435 8.8 HIGH netfs: Fix read abandonment during retry
CVE-2026-31476 8.2 HIGH ksmbd: do not expire session on binding failure
CVE-2026-31464 8.1 HIGH scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
CVE-2026-31513 8.1 HIGH Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req
CVE-2026-31488 7.8 HIGH drm/amd/display: Do not skip unrelated mode changes in DSC validation
CVE-2026-31494 7.8 HIGH net: macb: use the current queue number for stats
CVE-2026-31479 7.8 HIGH drm/xe: always keep track of remap prev/next
CVE-2026-31502 7.8 HIGH team: fix header_ops type confusion with non-Ethernet ports
CVE-2026-31453 7.8 HIGH xfs: avoid dereferencing log items after push callbacks
CVE-2026-31504 7.8 HIGH net: fix fanout UAF in packet_release() via NETDEV_UP race
CVE-2026-31505 7.8 HIGH iavf: fix out-of-bounds writes in iavf_get_ethtool_stats()

Showing top 20 of 100 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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