ext4: avoid infinite loops caused by residual data
In the Linux kernel, the following vulnerability has been resolved: ext4: avoid infinite loops caused by residual data On the mkdir/mknod path, when mapping logical blocks to physical blocks, if inserting a new extent into the extent tree fails (in this example, because the file system disabled the huge file feature when marking the inode as dirty), ext4_ext_map_blocks() only calls ext4_free_blocks() to reclaim the physical block without deleting the corresponding data in the extent tree. This causes subsequent mkdir operations to reference the previously reclaimed physical block number again, even though this physical block is already being used by the xattr block. Therefore, a situation arises where both the directory and xattr are using the same buffer head block in memory simultaneously. The above causes ext4_xattr_block_set() to enter an infinite loop about "inserted" and cannot release the inode lock, ultimately leading to the 143s blocking problem mentioned in [1]. If the metadata is corrupted, then trying to remove some extent space can do even more harm. Also in case EXT4_GET_BLOCKS_DELALLOC_RESERVE was passed, remove space wrongly update quota information. Jan Kara suggests distinguishing between two cases: 1) The error is ENOSPC or EDQUOT - in this case the filesystem is fully consistent and we must maintain its consistency including all the accounting. However these errors can happen only early before we've inserted the extent into the extent tree. So current code
CVE-2026-31448
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31448
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "315054f023d28ee64f308adf8b5737831541776b",
"lessThan": "c66545e83a802c3851d9be27a41c0479dd29ff0c",
"versionType": "git"
},
{
"status": "affected",
"version": "315054f023d28ee64f308adf8b5737831541776b",
"lessThan": "ecc50bfca9b5c2ee6aeef998181689b80477367b",
"versionType": "git"
},
{
"status": "affected",
"version": "315054f023d28ee64f308adf8b5737831541776b",
"lessThan": "3a7667595bcad84da53fc156a418e110267c3412",
"versionType": "git"
},
{
"status": "affected",
"version": "315054f023d28ee64f308adf8b5737831541776b",
"lessThan": "416c86f30f91b4fb2642ef6b102596ca898f41a5",
"versionType": "git"
},
{
"status": "affected",
"version": "315054f023d28ee64f308adf8b5737831541776b",
"lessThan": "64f425b06b3bea9abc8977fd3982779b3ad070c9",
"versionType": "git"
},
{
"status": "affected",
"version": "315054f023d28ee64f308adf8b5737831541776b",
"lessThan": "5422fe71d26d42af6c454ca9527faaad4e677d6c",
"versionType": "git"
}
],
"programFiles": [
"fs/ext4/extents.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.22"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.22",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.131",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.80",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/ext4/extents.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31448
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #39880 · Revision 1
- Added to Heist Feed
- Publisher date