f2fs: use the mount idmap for the owner check in f2fs_xattr_advise_set()
In the Linux kernel, the following vulnerability has been resolved: f2fs: use the mount idmap for the owner check in f2fs_xattr_advise_set() f2fs_xattr_advise_set() calls inode_owner_or_capable() with &nop_mnt_idmap before allowing the "system.advise" xattr to be set, instead of the idmap that the VFS passes to the ->set() handler. f2fs supports idmapped mounts, so on such a mount this checks the caller's fsuid against the unmapped on-disk owner rather than the mapped owner: the actual owner can be wrongly denied with -EPERM and an unrelated caller wrongly allowed. Pass the handler's idmap instead.
CVE-2026-89839
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-2026-89839
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": "01beba7957a26f9b7179127e8ad56bb5a0f56138",
"lessThan": "4c0c610b480cfbc57528aa1acbd6be12ed2a6fb1",
"versionType": "git"
},
{
"status": "affected",
"version": "01beba7957a26f9b7179127e8ad56bb5a0f56138",
"lessThan": "c3e2692c7a58e0bdb84bd658d827e89dcecea3ad",
"versionType": "git"
},
{
"status": "affected",
"version": "01beba7957a26f9b7179127e8ad56bb5a0f56138",
"lessThan": "3b681229e9f8fb1dd29bc65983bf3c87779e4ca3",
"versionType": "git"
},
{
"status": "affected",
"version": "01beba7957a26f9b7179127e8ad56bb5a0f56138",
"lessThan": "ab31e3b774f5d06b4489cef6c297b48c47c9dcbd",
"versionType": "git"
},
{
"status": "affected",
"version": "01beba7957a26f9b7179127e8ad56bb5a0f56138",
"lessThan": "a54ffce4637acb0db8e695188a6c7f99f14c3576",
"versionType": "git"
}
],
"programFiles": [
"fs/f2fs/xattr.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/f2fs/xattr.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89839
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36291 · Revision 1
- Added to Heist Feed
- Publisher date