scsi: qla2xxx: Zero-init bsg stack buffers to avoid info leak
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 7 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: scsi: qla2xxx: Zero-init bsg stack buffers to avoid info leak Several bsg handlers stage their request/reply in an uninitialized 256-byte on-stack buffer (uint8_t bsg[DMA_POOL_SIZE]) and fill it via sg_copy_to_buffer(), which only copies as many bytes as the user-supplied request payload. When the request is shorter than the structure, the remainder of the buffer is left holding stale stack data. qla2x00_read_fru_status() and qla2x00_read_i2c() then copy the full structure back to the reply payload with sg_copy_from_buffer(), leaking the uninitialized stack bytes to user space. The write/update paths do not copy the buffer back, but can feed uninitialized fields to the device. Zero the stack buffer at declaration in all five handlers, mirroring the heap kzalloc() approach, so short requests can no longer expose stale memory.
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 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. 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 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | 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 |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-89843
- 2026-10-03 Alias added: GHSA-x3rh-x4gx-m2j8
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-11-04 Affected versions changed · Red Hat
- 2026-11-04 CVSS score added · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/1c820d0900e4aacd5020b989159f6b4b2f7d0d6a
- https://git.kernel.org/stable/c/26bc6a2c235a70bfc9b6de412600208aca820e20
- https://git.kernel.org/stable/c/5ab32dff910291b5e6bf6223f8a4003536c1800a
- https://git.kernel.org/stable/c/947c6bfcf7f5ec924995bec43e3108b98c75b44e
- https://git.kernel.org/stable/c/708c0ec1e09c52fee24b74ce9398bf3f8d1c83fd
- https://git.kernel.org/stable/c/4fe5790674097897a1af1367d1e384f7e5a62fb7
- https://git.kernel.org/stable/c/7881faf862ee301ecfe3adc0725bd2fa0021cd95
- https://git.kernel.org/stable/c/b93d3bb3afe1b44489927de1eb4e66e8536a5935
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Sources
- CVE-2026-89843 · CVE Program
- CVE-2026-89843 · NVD
- FIRST EPSS
- GHSA-x3rh-x4gx-m2j8 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-89843 · Red Hat security data · CC BY 4.0
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