Bug 2481970 (CVE-2026-45974)

Summary: CVE-2026-45974 kernel: btrfs: fix invalid leaf access in btrfs_quota_enable() if ref key not found
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's btrfs filesystem. The `btrfs_quota_enable()` function contains a logic error where it attempts to access an invalid memory location if a specific key is not found during a search operation. This incorrect handling of search results can lead to invalid leaf access, potentially causing system instability or a denial of service (DoS) for affected systems.
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Description OSIDB Bzimport 2026-05-27 15:04:54 UTC 
In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix invalid leaf access in btrfs_quota_enable() if ref key not found

If btrfs_search_slot_for_read() returns 1, it means we did not find any
key greater than or equals to the key we asked for, meaning we have
reached the end of the tree and therefore the path is not valid. If
this happens we need to break out of the loop and stop, instead of
continuing and accessing an invalid path.
Comment 1 Keith Grant 2026-05-27 22:37:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052737-CVE-2026-45974-c88c@gregkh/T