btrfs: check if root is readonly when setting posix acl
In the Linux kernel, the following vulnerability has been resolved: btrfs: check if root is readonly when setting posix acl For a filesystem which has btrfs read-only property set to true, all write operations including acl and xattr should be denied. However, acl can still be set even if btrfs ro property is true. This happens because no function on the set_acl code path checks the root is readonly or not. It was checked in btrfs_setxattr_trans() but got removed in commit 353c2ea735e4 ("btrfs: remove redundant readonly root check in btrfs_setxattr_trans") That commit didn't check if all the callers properly check the root's read-only flag. A previous fix is commit b51111271b03 ("btrfs: check if root is readonly while setting security xattr"). Always check if the root is read-only before performing the set acl operation.
CVE-2026-90263
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-2026-90263
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": "353c2ea735e4b54fb6250861e67b51b1bcb47198",
"lessThan": "20b2c2f3316e82a76ae3358c0bd45824f50f3fd5",
"versionType": "git"
},
{
"status": "affected",
"version": "353c2ea735e4b54fb6250861e67b51b1bcb47198",
"lessThan": "dc3a6e90a0a6350a6d43fed9f005f54171809580",
"versionType": "git"
},
{
"status": "affected",
"version": "353c2ea735e4b54fb6250861e67b51b1bcb47198",
"lessThan": "ce8103676f4d4b13e1f087fcfb34f80774d30be2",
"versionType": "git"
},
{
"status": "affected",
"version": "353c2ea735e4b54fb6250861e67b51b1bcb47198",
"lessThan": "d5602f96ff1e266f069b4d0d94f441050e057e06",
"versionType": "git"
},
{
"status": "affected",
"version": "353c2ea735e4b54fb6250861e67b51b1bcb47198",
"lessThan": "01c2f41fc441f75b3f9326443372faceb1cb6638",
"versionType": "git"
}
],
"programFiles": [
"fs/btrfs/acl.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.2",
"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": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/btrfs/acl.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90263
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48648 · Revision 1
- Added to Heist Feed
- Publisher date