Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/pci: Fix leak of uninitialized kernel data in SCLP report While report_error_write() checks that the provided buffer is at least as large as the header struct, but not that it is large enough to contain the report with the length claimed by report->length. If user-space provides a short buffer, meaning a larger report->length than the actually written payload, up to around 4K of kernel data from past the kmalloc(len + 1) sized buffer allocated in kernfs_fop_write_iter() will leak into the SCLP report. However, as the entity processing the SCLP is privileged and able to access at least the page including the report, this does not leak data that entity could not access but it is still an out of bounds read and a malformed error report that should be rejected.
References
- https://git.kernel.org/stable/c/126a7c227d8543e13903dd5622640c1f0fcc5a16
- https://git.kernel.org/stable/c/332f2d867f64dd530517e9a58394e3eab454df12
- https://git.kernel.org/stable/c/61ce6f9a527932f4482ebe00847490f17d63a0d1
- https://git.kernel.org/stable/c/8ac60ae2a307a50b599bf5d300b448d638f3ba29
- https://git.kernel.org/stable/c/ad1be38823d4b6dbc88648da296ca0c0f8824a55
- https://git.kernel.org/stable/c/ba5001db9bb23ff7d2ea328c405c287ffb07786f
- https://git.kernel.org/stable/c/eb10f25e32576bb3dbbea4457648614537f04211
- https://git.kernel.org/stable/c/ff31c34e921d11c7da3d7664ce495106267ca408
FAQ
What is CVE-2026-99124?
CVE-2026-99124 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: s390/pci: Fix leak of uninitialized kernel data in SCLP report While report_error_write() checks that the provided buffer is at le...
How severe is CVE-2026-99124?
CVSS scoring is not yet available for CVE-2026-99124. Check NVD for updates.
Is there a patch for CVE-2026-99124?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.