Out-of-bounds access via undersized realtime btree cursors
Published Sep 25, 2026 · Updated Sep 25, 2026
Out-of-bounds access in XFS realtime btree cursors in Linux 6.14 allows attackers to access memory beyond the cursor via a large btree. The rtrmap and rtrefcount maxlevels-on-disk calculations omit the inode-root level, so cursor storage is allocated for fewer levels than traversal can use. Triggering requires a sufficiently large XFS realtime reverse-mapping or refcount btree; the published record does not specify a resulting crash, disclosure, or code execution.
Summary
What happened
Out-of-bounds access in XFS realtime btree cursors in Linux 6.14 allows attackers to access memory beyond the cursor via a large btree. The rtrmap and rtrefcount maxlevels-on-disk calculations omit the inode-root level, so cursor storage is allocated for fewer levels than traversal can use. Triggering requires a sufficiently large XFS realtime reverse-mapping or refcount btree; the published record does not specify a resulting crash, disclosure, or code execution.
The record
- CVE
- CVE-2026-97548
- Published
- Sep 25, 2026
- Updated
- Sep 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 25, 2026CVE publishedPublication date reported by the CVE source.
- Sep 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.14
- Affected versionversion=9abe03a0e4f978615a2b1b484b8d09ca84c16ea0 <108114437915e61e8f88d1cbcc442c3f886a347e
- Affected versionversion=9abe03a0e4f978615a2b1b484b8d09ca84c16ea0 <84316cb25af95a60e655ccc8fe646bb5ad631b71
- Affected versionversion=9abe03a0e4f978615a2b1b484b8d09ca84c16ea0 <aa301322f72f82f26e4ba0826018d41388ab9896
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
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Technologies
Your stack
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Your stack
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