xfs: resample the data fork mapping after cycling ILOCK
In the Linux kernel, the following vulnerability has been resolved: xfs: resample the data fork mapping after cycling ILOCK xfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode, a data fork mapping, and a cow fork mapping. Unfortunately, these two helpers cycle the ILOCK to grab a transaction, which means that the mappings are stale as soon as we reacquire the ILOCK. Currently we refresh the cow fork mapping by re-calling xfs_find_trim_cow_extent, but we don't refresh the data fork mapping beforehand, which means that the xfs_bmap_trim_cow in that function queries the refcount btree about the wrong physical blocks and returns an inaccurate value in *shared. If *shared is now false, the directio write proceeds with a stale data fork mapping. Fix this by querying the data fork mapping if the sequence counter changes across the ILOCK cycle.
CVE-2026-64600
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-2026-64600
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": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
"lessThan": "dc11be133efca5fe3a2fb02b016dee825cc12f18",
"versionType": "git"
},
{
"status": "affected",
"version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
"lessThan": "b8c9aa832b52680ee40d6cab0efb081f9a69df05",
"versionType": "git"
},
{
"status": "affected",
"version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
"lessThan": "50f0012da1040f69a4e788cd9aed587c9a04983f",
"versionType": "git"
},
{
"status": "affected",
"version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
"lessThan": "e705d81a7193dd19e69b8e2bad4696d78a4ea075",
"versionType": "git"
},
{
"status": "affected",
"version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
"lessThan": "206c09b04dc5469c7ff14d8aceff2d47c88078d9",
"versionType": "git"
},
{
"status": "affected",
"version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
"lessThan": "44f891bc088958399eec27f7604928694aa35581",
"versionType": "git"
},
{
"status": "affected",
"version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
"lessThan": "2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7",
"versionType": "git"
}
],
"programFiles": [
"fs/xfs/xfs_reflink.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/xfs/xfs_reflink.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64600
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41103 · Revision 1
- Added to Heist Feed
- Publisher date