btrfs: check if root is readonly when setting posix acl

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Summary

CVECVE-2026-90263
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:22 UTC
Updated2026-09-17 17:17:22 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 353c2ea735e4b54fb6250861e67b51b1bcb47198 d5602f96ff1e266f069b4d0d94f441050e057e06 git Not specified
CNA Linux Linux affected 353c2ea735e4b54fb6250861e67b51b1bcb47198 01c2f41fc441f75b3f9326443372faceb1cb6638 git Not specified
CNA Linux Linux affected 5.2 Not specified
CNA Linux Linux unaffected 5.2 semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/01c2f41fc441f75b3f9326443372faceb1cb6638 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d5602f96ff1e266f069b4d0d94f441050e057e06 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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