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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-99163

tracing/histograms: Reject non-stacktrace fields for synthetic stacktrace fields

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Status
Published
Published
Updated
Assigning organization
Linux

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().

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • b9453380c1c542fd095a4dbe9251eeba4022bbce to < eba0a6365a0f38f7598a02fc7f9ee341c7efe7f5affected
  • 5f52389bdd9eafb63b3a2f804e02aeb17b6a5f55 to < 326c45c9e201e3ff4c9e9e0e14c2c91364d6c8beaffected
  • f3baa42afeea0d5f04ad31525e861199d02210cc to < 6c4e4946febb585d2fc93a02a0cd12cec715bb32affected
  • 00cf3d672a9dd409418647e9f98784c339c3ff63 to < 7e0d05a6234a984ac23b8a563fb7f66f2572b668affected
  • 00cf3d672a9dd409418647e9f98784c339c3ff63 to < 648687f2b448d8527cd7b112fe5d4bd0fec85a87affected
  • 00cf3d672a9dd409418647e9f98784c339c3ff63 to < 1f36e4ddd05d540f363dbaa4c23042549f15b3efaffected
  • 00cf3d672a9dd409418647e9f98784c339c3ff63 to < deb336ae7c7b341591a6862cf6fcfeca97c77dfdaffected
  • 00cf3d672a9dd409418647e9f98784c339c3ff63 to < a244c241593b5b38a08f0df2cb43c26574efbdcbaffected
  • 5.10.237 to < 5.10.273affected
  • 5.15.124 to < 5.15.224affected
  • 6.1.43 to < 6.1.191affected

Linux Linux

Default version status: affected

  • 6.3affected
  • 0 to < 6.3unaffected
  • 5.10.273 to ≤ 5.10.*unaffected
  • 5.15.224 to ≤ 5.15.*unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.161 to ≤ 6.6.*unaffected
  • 6.12.115 to ≤ 6.12.*unaffected
  • 6.18.59 to ≤ 6.18.*unaffected
  • 7.2.13 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References