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CVE-2026-99163— tracing/histograms: Reject non-stacktrace fields for synthetic stacktrace fields

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： tracing/histograms：拒绝将非堆栈跟踪字段用作合成堆栈跟踪字段 在 check_synth_field() 函数中，当合成事件字段为堆栈跟踪字段（field->is_stack 为真），而直方图字段并非"long["类型的堆栈跟踪数组时，验证逻辑会回退到通用的尺寸和符号性比较。 由于 parse_synth_field() 将堆栈跟踪字段的类型设置为 "__data_loc unsigned long[]"，其大小为 sizeof(u64)（即 8 字节

AI Predicted 7.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1562.008

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 00cf3d672a9dd409418647e9f98784c339c3ff63< 1f36e4ddd05d540f363dbaa4c23042549f15b3ef affected
00cf3d672a9dd409418647e9f98784c339c3ff63< deb336ae7c7b341591a6862cf6fcfeca97c77dfd affected
00cf3d672a9dd409418647e9f98784c339c3ff63< a244c241593b5b38a08f0df2cb43c26574efbdcb affected
b9453380c1c542fd095a4dbe9251eeba4022bbce affected
5f52389bdd9eafb63b3a2f804e02aeb17b6a5f55 affected
f3baa42afeea0d5f04ad31525e861199d02210cc affected
5.10.237< 5.11 affected
5.15.124< 5.16 affected
… +6 more rows
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I. Basic Information for CVE-2026-99163

Vulnerability Information
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Vulnerability Title
tracing/histograms: Reject non-stacktrace fields for synthetic stacktrace fields
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tracing/histograms: Reject non-stacktrace fields for synthetic stacktrace fields In check_synth_field(), when a synthetic event field is a stacktrace (field->is_stack) and the histogram field is not a "long[" stacktrace array, validation falls through to the generic size and signedness comparison. Because parse_synth_field() sets a stacktrace field's type to "__data_loc unsigned long[]", its size is sizeof(u64) and synth_field_signed() marks it as signed. Consequently, any 8-byte signed scalar histogram field passes the fallback check, and its scalar value is subsequently dereferenced as a kernel stacktrace pointer in get_field_size() and trace_stack(). Furthermore, checking strstr(hist_field->type, "long[") is insufficient because tracepoint fields defined with __bitmask() or __rel_bitmask() also have type "__data_loc unsigned long[]" or "__rel_loc unsigned long[]", whilst create_hist_field() treats them as 4-byte scalar values without HIST_FIELD_FL_STACKTRACE. Propagate HIST_FIELD_FL_STACKTRACE to variable references and field variables (whilst excluding variable aliases from per-element stacktrace capture), and reject any mismatch between HIST_FIELD_FL_STACKTRACE and field->is_stack in check_synth_field().
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 00cf3d672a9dd409418647e9f98784c339c3ff63 ~ 1f36e4ddd05d540f363dbaa4c23042549f15b3ef -
Linux Linux 6.3 -

II. Public POCs for CVE-2026-99163

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III. Intelligence Information for CVE-2026-99163

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Patches & Fixes for CVE-2026-99163 (3)

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

CVE-2026-99143 tracing: Keep the predicate limit separate from program capacity
CVE-2026-99129 selinux: fix BPF token permission checks
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-2026-99154 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
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-2026-99150 drm/amdgpu: don't drop the runtime PM reference twice in amdgpu_gpr

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux