CVE-2026-90263btrfs: check if root is readonly when setting posix acl
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 353c2ea735e4b54fb6250861e67b51b1bcb47198 before ce8103676f4d4b13e1f087fcfb34f80774d30be2; from 353c2ea735e4b54fb6250861e67b51b1bcb47198 before d5602f96ff1e266f069b4d0d94f441050e057e06; 353c2ea735e4b54fb6250861e67b51b1bcb47198 builds before 01c2f41fc441f75b3f9326443372faceb1cb6638 | CNA record |
References
- https://git.kernel.org/stable/c/ce8103676f4d4b13e1f087fcfb34f80774d30be2
- https://git.kernel.org/stable/c/d5602f96ff1e266f069b4d0d94f441050e057e06
- https://git.kernel.org/stable/c/01c2f41fc441f75b3f9326443372faceb1cb6638
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.