ntfs3: fix circular locking dependency in run_unpack_ex
In the Linux kernel, the following vulnerability has been resolved: ntfs3: fix circular locking dependency in run_unpack_ex Syzbot reported a circular locking dependency between wnd->rw_lock (sbi->used.bitmap) and ni->file.run_lock. The deadlock scenario: 1. ntfs_extend_mft() takes ni->file.run_lock then wnd->rw_lock. 2. run_unpack_ex() takes wnd->rw_lock then tries to acquire ni->file.run_lock inside ntfs_refresh_zone(). This creates an AB-BA deadlock. Fix this by using down_read_trylock() instead of down_read() when acquiring run_lock in run_unpack_ex(). If the lock is contended, skip ntfs_refresh_zone() - the MFT zone will be refreshed on the next MFT operation. This breaks the circular dependency since we never block waiting for run_lock while holding wnd->rw_lock.
CVE-2026-43127
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-2026-43127
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": "57f7979aefdcef66326bda47e07ee0d8be64bf21",
"lessThan": "d60f09d2d16c44a797d8cb67015cde2508720506",
"versionType": "git"
},
{
"status": "affected",
"version": "db7fc56646cafe39599a4c21f1398e2bdfd5c185",
"lessThan": "76016d15bbd90caa0ce7765fddf9bde8e943e601",
"versionType": "git"
},
{
"status": "affected",
"version": "5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36",
"lessThan": "b014372b62237521444ee51384549bdf48b79015",
"versionType": "git"
},
{
"status": "affected",
"version": "5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36",
"lessThan": "b8d22d9d8260b0f4f4d8e2898c98037c9982ea66",
"versionType": "git"
},
{
"status": "affected",
"version": "5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36",
"lessThan": "08ce2fee1b869ecbfbd94e0eb2630e52203a2e03",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.66",
"lessThan": "6.6.160",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.5",
"lessThan": "6.12.114",
"versionType": "semver"
}
],
"programFiles": [
"fs/ntfs3/run.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.16",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.6",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/ntfs3/run.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43127
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46266 · Revision 1
- Added to Heist Feed
- Publisher date