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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99163
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 11:17:36 UTC
Updated2026-10-31 13:17:58 UTC
DescriptionIn 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().

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001830000 probability, percentile 0.079290000 (date 2026-10-31)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b9453380c1c542fd095a4dbe9251eeba4022bbce eba0a6365a0f38f7598a02fc7f9ee341c7efe7f5 git Not specified
CNA Linux Linux affected 5f52389bdd9eafb63b3a2f804e02aeb17b6a5f55 326c45c9e201e3ff4c9e9e0e14c2c91364d6c8be git Not specified
CNA Linux Linux affected f3baa42afeea0d5f04ad31525e861199d02210cc 6c4e4946febb585d2fc93a02a0cd12cec715bb32 git Not specified
CNA Linux Linux affected 00cf3d672a9dd409418647e9f98784c339c3ff63 7e0d05a6234a984ac23b8a563fb7f66f2572b668 git Not specified
CNA Linux Linux affected 00cf3d672a9dd409418647e9f98784c339c3ff63 648687f2b448d8527cd7b112fe5d4bd0fec85a87 git Not specified
CNA Linux Linux affected 00cf3d672a9dd409418647e9f98784c339c3ff63 1f36e4ddd05d540f363dbaa4c23042549f15b3ef git Not specified
CNA Linux Linux affected 00cf3d672a9dd409418647e9f98784c339c3ff63 deb336ae7c7b341591a6862cf6fcfeca97c77dfd git Not specified
CNA Linux Linux affected 00cf3d672a9dd409418647e9f98784c339c3ff63 a244c241593b5b38a08f0df2cb43c26574efbdcb git Not specified
CNA Linux Linux affected 5.10.237 5.10.273 semver Not specified
CNA Linux Linux affected 5.15.124 5.15.224 semver Not specified
CNA Linux Linux affected 6.1.43 6.1.191 semver Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 semver Not specified
CNA Linux Linux unaffected 5.10.273 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.224 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.191 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.161 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.115 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.59 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.13 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/648687f2b448d8527cd7b112fe5d4bd0fec85a87 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/deb336ae7c7b341591a6862cf6fcfeca97c77dfd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eba0a6365a0f38f7598a02fc7f9ee341c7efe7f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a244c241593b5b38a08f0df2cb43c26574efbdcb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6c4e4946febb585d2fc93a02a0cd12cec715bb32 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/326c45c9e201e3ff4c9e9e0e14c2c91364d6c8be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1f36e4ddd05d540f363dbaa4c23042549f15b3ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7e0d05a6234a984ac23b8a563fb7f66f2572b668 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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