Bug 2513381 (CVE-2026-68422)

Summary: CVE-2026-68422 kernel: btrfs: fix root leak if its reloc root is unexpected in merge_reloc_roots()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the btrfs filesystem component of the Linux kernel. An unexpected relocation root in the `merge_reloc_roots()` function can lead to a resource leak. This occurs because a reference to the root is not properly released, potentially causing system instability or a denial of service due to resource exhaustion.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-08-10 12:34:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix root leak if its reloc root is unexpected in merge_reloc_roots()

If we have an unexpected reloc_root for our root, we jump to the out label
but never drop the reference we obtained for root, resulting in a leak.
Add a missing btrfs_put_root() call.