ext4: fix buffer_head leak in ext4_init_orphan_info
Key facts
- Attack vector
- —
- Privileges required
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- User interaction
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- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 4 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix buffer_head leak in ext4_init_orphan_info ext4_init_orphan_info() reads orphan file blocks with ext4_bread() and stores the returned buffer_head in oi->of_binfo[i].ob_bh. If ext4_bread() succeeds but the orphan block magic or checksum validation fails, the function jumps to out_free. However, the old out_free loop starts releasing buffers from i - 1, so the current buffer_head at index i is skipped. This leaks the buffer_head reference obtained by ext4_bread() on the bad magic and bad checksum error paths. Fix this by tracking the number of successfully read buffer_heads and releasing exactly those buffer_heads on the error path.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6, 7.3
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-92494
- 2026-10-03 Alias added: GHSA-72fx-6p3v-7c2x
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-11-07 Affected versions changed · Red Hat
References
Other 7
- https://git.kernel.org/stable/c/a9a6ec1298f9bc134b2c5db27d25bb10603b7113
- https://git.kernel.org/stable/c/35fc83c65faf7949f5701bb34b20f822560a7718
- https://git.kernel.org/stable/c/74637f7fef030e5fb2e835b7dfeb05efdc48e0fe
- https://git.kernel.org/stable/c/6ec53ccab0d691b3c73e03d930343ca45987e88d
- https://git.kernel.org/stable/c/1399f102d8a1855c1a38506057306ec79d0787d9
- https://git.kernel.org/stable/c/e1e342d9a561c016b8531ec1f4dcefaad9d64954
- https://git.kernel.org/stable/c/05704335803b69c1bfa8637b7ada942bf2ee8a41
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Sources
- CVE-2026-92494 · CVE Program
- CVE-2026-92494 · NVD
- FIRST EPSS
- GHSA-72fx-6p3v-7c2x · GitHub Advisory Database · CC BY 4.0
- CVE-2026-92494 · Red Hat security data · CC BY 4.0
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