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CVE-2026-99124

UnknownEPSS 0.21%

Last modified

CVE-2026-99124 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.21%

10.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 368704a65be8620df795ccbeb44e025dafbc3e1f, < ad1be38823d4b6dbc88648da296ca0c0f8824a55; >= 368704a65be8620df795ccbeb44e025dafbc3e1f, < 61ce6f9a527932f4482ebe00847490f17d63a0d1; >= 368704a65be8620df795ccbeb44e025dafbc3e1f, < 332f2d867f64dd530517e9a58394e3eab454df12; >= 368704a65be8620df795ccbeb44e025dafbc3e1f, < ff31c34e921d11c7da3d7664ce495106267ca408; >= 368704a65be8620df795ccbeb44e025dafbc3e1f, < eb10f25e32576bb3dbbea4457648614537f04211; >= 368704a65be8620df795ccbeb44e025dafbc3e1f, < ba5001db9bb23ff7d2ea328c405c287ffb07786f; >= 368704a65be8620df795ccbeb44e025dafbc3e1f, < 126a7c227d8543e13903dd5622640c1f0fcc5a16; >= 368704a65be8620df795ccbeb44e025dafbc3e1f, < 8ac60ae2a307a50b599bf5d300b448d638f3ba29
LinuxLinux4.7

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-99124?
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.
How severe is CVE-2026-99124?
Severity scoring for CVE-2026-99124 is pending analysis. The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-99124?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST