nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation Shuangpeng Bai reported that KASAN detected a slab-out-of-bounds error in nilfs_direct_propagate() during testing. Analysis revealed that after truncating a file, a node block immediately below the B-tree root was not deleted. Instead, it remained in the B-tree node cache in a dirty state. The log writer subsequently detected this block and incorrectly invoked nilfs_direct_propagate() on it, which is designed to handle only data blocks in direct mapping. B-tree nodes in the cache are managed by virtual block numbers, and their logical keys typically exceed the range expected by direct mapping. Consequently, processing such a node as a direct mapping entry triggers a slab-out-of-bounds access. The root cause is that when a B-tree mapping collapses into a direct mapping during truncation, an intermediate node block pointed to by the root node is left behind as garbage instead of being explicitly deleted. This resolves the issue by adding a nilfs_btree_discard() operation to delete the remaining intermediate node block during the conversion. A 'deform' flag is added to the bop_delete interface to explicitly signal that the deletion is part of a mapping transformation. This allows the B-tree mapping implementation to perform the necessary cleanup and discarding of the residual node structure that would be otherwise be left orphaned after th
CVE-2026-89723
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-2026-89723
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": "36a580eb489f54d81a0534974962e732a314b999",
"lessThan": "39005fd1ce654ffdecacddc406b9a038efe606e6",
"versionType": "git"
},
{
"status": "affected",
"version": "36a580eb489f54d81a0534974962e732a314b999",
"lessThan": "bf49e6f6ddc12445a0330708b365de6458085980",
"versionType": "git"
},
{
"status": "affected",
"version": "36a580eb489f54d81a0534974962e732a314b999",
"lessThan": "4a1bb1f9f24a935c9b3f4fbf98012fa6d4ad826d",
"versionType": "git"
},
{
"status": "affected",
"version": "36a580eb489f54d81a0534974962e732a314b999",
"lessThan": "b313edfbc0c2a60f7ce09b2e81ee71909ab8ddaf",
"versionType": "git"
},
{
"status": "affected",
"version": "36a580eb489f54d81a0534974962e732a314b999",
"lessThan": "5d3783c451a546373662ee11ec17019273e68034",
"versionType": "git"
},
{
"status": "affected",
"version": "36a580eb489f54d81a0534974962e732a314b999",
"lessThan": "448636c745a3f3b8582a0b8ce718c890a11c0fa9",
"versionType": "git"
},
{
"status": "affected",
"version": "36a580eb489f54d81a0534974962e732a314b999",
"lessThan": "28362e8ce51377afdec1782e661e808328a10514",
"versionType": "git"
},
{
"status": "affected",
"version": "36a580eb489f54d81a0534974962e732a314b999",
"lessThan": "45662dedb8f272ef7f16e69f13424c4bd0399240",
"versionType": "git"
}
],
"programFiles": [
"fs/nilfs2/bmap.c",
"fs/nilfs2/bmap.h",
"fs/nilfs2/btree.c",
"fs/nilfs2/direct.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.30"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.30",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/nilfs2/bmap.c",
"fs/nilfs2/bmap.h",
"fs/nilfs2/btree.c",
"fs/nilfs2/direct.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89723
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35199 · Revision 1
- Added to Heist Feed
- Publisher date