Invalid metadata propagation via stale buffer validation
Published Sep 4, 2026 · Updated Sep 4, 2026
Improper buffer validation in the Linux kernel OCFS2 implementation allows attackers to pass inconsistent metadata to upper layers. In ocfs2_read_blocks(), a shared buffer head can retain BH_Uptodate after validation fails because put_bh() does not necessarily release its final reference. Reachability requires OCFS2 to encounter inconsistent on-disk data; the announcement identifies no resulting crash, disclosure, or code execution.
Summary
What happened
Improper buffer validation in the Linux kernel OCFS2 implementation allows attackers to pass inconsistent metadata to upper layers. In ocfs2_read_blocks(), a shared buffer head can retain BH_Uptodate after validation fails because put_bh() does not necessarily release its final reference. Reachability requires OCFS2 to encounter inconsistent on-disk data; the announcement identifies no resulting crash, disclosure, or code execution.
The record
- CVE
- CVE-2026-80881
- Published
- Sep 4, 2026
- Updated
- Sep 4, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 4, 2026CVE publishedPublication date reported by the CVE source.
- Sep 4, 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=01f93d5e36753fc4d06ec67f05ce78c9c6f2dd56
- Affected versionversion=4.14.157 <4.15
- Affected versionversion=4.19.87 <4.20
- Affected versionversion=4.20
- Affected versionversion=4.4.204 <4.5
- Affected versionversion=4.9.204 <4.10
- Affected versionversion=65cbd1279f4b999d56a838344a30642db24cd215
- Affected versionversion=6c150df9c2e80b5cf86f5a0d98beb7390ad63bfc
- Affected versionversion=97e1db17bc1ef4c2e1789bc9323c7be44fba53f8
- Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <0e389fc290c350c67591abf4c367119f4689f310
- Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <4ab17e328522a4df5fe0f0dcf39098118b1feeaa
- Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <5927acb3e2c99985a14adecd9d1b67ba191c622d
- Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <61f7a5acb3bf8fc97dad78f54b1e8d0e1c819766
- Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <6371a07148ee979af22a9d6f4c277462953a9a4a
- Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <9e7a057934cdd58e4cc94350bcfe5367bbee0f8e
- Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <a4eae1499c760949a93459d11390bd1fd823d31d
- Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <ecb3f9386f4353034caef77239473c627232db17
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
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.
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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