In the Linux kernel, the following vulnerability has been resolved: s390/pci: Fix leak of uninitialized kernel data in SCLP report While…
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 reporterrorwrite() 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 kernfsfopwriteiter() 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.
Assessment
- CVSS
- Not yet scored
- Severity
- Unscored
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 28 October 2026
- Last updated
- 30 October 2026
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
At the source
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
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