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().
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= b9453380c1c542fd095a4dbe9251eeba4022bbce, < eba0a6365a0f38f7598a02fc7f9ee341c7efe7f5; >= 5f52389bdd9eafb63b3a2f804e02aeb17b6a5f55, < 326c45c9e201e3ff4c9e9e0e14c2c91364d6c8be; >= f3baa42afeea0d5f04ad31525e861199d02210cc, < 6c4e4946febb585d2fc93a02a0cd12cec715bb32; >= 00cf3d672a9dd409418647e9f98784c339c3ff63, < 7e0d05a6234a984ac23b8a563fb7f66f2572b668; >= 00cf3d672a9dd409418647e9f98784c339c3ff63, < 648687f2b448d8527cd7b112fe5d4bd0fec85a87; >= 00cf3d672a9dd409418647e9f98784c339c3ff63, < 1f36e4ddd05d540f363dbaa4c23042549f15b3ef; >= 00cf3d672a9dd409418647e9f98784c339c3ff63, < deb336ae7c7b341591a6862cf6fcfeca97c77dfd; >= 00cf3d672a9dd409418647e9f98784c339c3ff63, < a244c241593b5b38a08f0df2cb43c26574efbdcb; >= 5.10.237, < 5.10.273; >= 5.15.124, < 5.15.224; >= 6.1.43, < 6.1.191 |
| Linux | Linux | 6.3 |
References
- https://git.kernel.org/stable/c/1f36e4ddd05d540f363dbaa4c23042549f15b3ef
- https://git.kernel.org/stable/c/326c45c9e201e3ff4c9e9e0e14c2c91364d6c8be
- https://git.kernel.org/stable/c/648687f2b448d8527cd7b112fe5d4bd0fec85a87
- https://git.kernel.org/stable/c/6c4e4946febb585d2fc93a02a0cd12cec715bb32
- https://git.kernel.org/stable/c/7e0d05a6234a984ac23b8a563fb7f66f2572b668
- https://git.kernel.org/stable/c/a244c241593b5b38a08f0df2cb43c26574efbdcb
- https://git.kernel.org/stable/c/deb336ae7c7b341591a6862cf6fcfeca97c77dfd
- https://git.kernel.org/stable/c/eba0a6365a0f38f7598a02fc7f9ee341c7efe7f5
Timeline
- Published
- Oct 28, 2026
- Last modified
- Oct 31, 2026
- NVD status
- Received