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CVE-2026-99124— s390/pci: Fix leak of uninitialized kernel data in SCLP report

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： s390/PCI：修复 SCLP 报告中未初始化内核数据泄露问题 在 函数中，虽然会检查用户提供的缓冲区是否至少与头部结构体一样大，但并未验证该缓冲区是否足够容纳由 所声明的报告长度。如果用户空间提供了一个过短的缓冲区（即 大于实际写入的有效载荷长度），则最多约 4KB 的内核数据（位于 中通过 分配的缓冲区之后的区域）会泄露到 SCLP 报告中。 然而，由于处理 SCLP 的实体具有特权，并且能够访问至少包含该报告的整个页面，因此该泄露并未暴露该实体原本无法访问的数据

AI Predicted 5.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 368704a65be8620df795ccbeb44e025dafbc3e1f< ba5001db9bb23ff7d2ea328c405c287ffb07786f affected
368704a65be8620df795ccbeb44e025dafbc3e1f< 126a7c227d8543e13903dd5622640c1f0fcc5a16 affected
368704a65be8620df795ccbeb44e025dafbc3e1f< 8ac60ae2a307a50b599bf5d300b448d638f3ba29 affected
4.7 affected
< 4.7 unaffected
6.18.59≤ 6.18.* unaffected
7.2.13≤ 7.2.* unaffected
7.3≤ * unaffected
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I. Basic Information for CVE-2026-99124

Vulnerability Information
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Vulnerability Title
s390/pci: Fix leak of uninitialized kernel data in SCLP report
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 368704a65be8620df795ccbeb44e025dafbc3e1f ~ ba5001db9bb23ff7d2ea328c405c287ffb07786f -
Linux Linux 4.7 -

II. Public POCs for CVE-2026-99124

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III. Intelligence Information for CVE-2026-99124

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Patches & Fixes for CVE-2026-99124 (3)

Same Patch Batch · Linux · 2026-10-28 · 117 CVEs total

CVE-2026-99144 sched_ext: Fix use-after-free of a destroyed user DSQ by a deferred reenqueue
CVE-2026-99130 io_uring/cancel: don't spin on local work the task can't run
CVE-2026-99131 xfs: fix capability check in xfs
CVE-2026-99133 net/iucv: fix the recvmsg window update
CVE-2026-99132 xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf
CVE-2026-99134 mac802154: fix data race and NULL deref on local->assoc_dev
CVE-2026-99135 dm-integrity: fix infinite loop on discard with large tag size
CVE-2026-99137 cifs: don't update i_size in cifs_do_truncate without a cached handle
CVE-2026-99136 dm-crypt: fix a tiny race condition in crypt_dec_pending
CVE-2026-99138 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)
CVE-2026-99140 tracing: Fix hist trigger timestamps for buffered events
CVE-2026-99139 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CONGESTION)
CVE-2026-99141 tracing: Fix crash in print_graph_function_event()
CVE-2026-99142 tracing: Check operator stack capacity before pushing
CVE-2026-99143 tracing: Keep the predicate limit separate from program capacity
CVE-2026-99156 scsi: st: Fix use-after-free race between st_remove() and st_open()
CVE-2026-99153 scsi: libiscsi: Validate the ITT reflected in a Reject PDU
CVE-2026-99152 scsi: libiscsi: Validate the task named by a management response
CVE-2026-99154 scsi: libiscsi: Reject a negative task index from parse_pdu_itt
CVE-2026-99151 drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions

Showing top 20 of 117 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux