Bug 2541300 (CVE-2026-98082)

Summary: CVE-2026-98082 kernel: btrfs: fix the possible bioc_list memory leak during error
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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 Linux kernel's Btrfs file system. Under specific error handling conditions, such as storage input/output (I/O) errors or failures during RAID extent operations, the kernel fails to release allocated block I/O tracking memory. A local user capable of triggering these file system error paths could cause continuous memory leaks, resulting in kernel memory exhaustion and a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-09-25 11:17:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix the possible bioc_list memory leak during error

There are two possible ways to leak bioc memory on
btrfs_ordered_extent::bioc_list:

- An error occurred for btrfs_insert_one_raid_extent()
  Then the function btrfs_insert_raid_extent() immediately return
  without freeing any bioc in the bioc_list.

- An ordered extent hit an IO error
  In that case the ordered extent will have BTRFS_ORDERED_IOERR set, and
  skip the call on btrfs_insert_raid_extent() completely.

Fix the problem by:

- Introduce a new helper, btrfs_cleanup_ordered_bioc_list()
  Which will remove all bioc from the bioc_list, and release the bioc.

- Call the above helper for btrfs_insert_raid_extent()
  So that the cleanup helper is always called no matter what.

- Call the above helper for btrfs_finish_one_ordered()
  This is called just before the final release on the ordered extent.

This was reported by Sashiko when reviewing another patch.
Comment 1 Keith Grant 2026-09-25 17:25:33 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98082.mbox