ACPI: pfr_update: fix stack buffer overflow in query_capability()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89587
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:43 UTC
Updated2026-09-14 13:19:13 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ACPI: pfr_update: fix stack buffer overflow in query_capability() query_capability() copies four ACPI buffer objects returned by the firmware _DSM into fixed-size u8[16] fields in struct pfru_update_cap_info using memcpy with the firmware-supplied length: memcpy(&cap_hdr->code_type, elements[CAP_CODE_TYPE_IDX].buffer.pointer, elements[CAP_CODE_TYPE_IDX].buffer.length); The same pattern repeats for drv_type, platform_id, and oem_id. If the firmware returns buffer.length > 16 for any of these fields, memcpy writes past the destination array. struct pfru_update_cap_info is stack-allocated in pfru_ioctl(). Confirmed with KASAN on 7.2-rc6: three stack-out-of-bounds reports are generated when a DSM returns 64-byte buffers, with writes reaching 44 bytes past the end of cap_hdr's [64, 156) frame window into adjacent stack redzones. Introduce a helper pointer to out_obj->package.elements and use it to validate each buffer length against its destination field size before copying, returning -EINVAL if the firmware supplies an oversized buffer.

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: 0.001420000 probability, percentile 0.038390000 (date 2026-09-14)

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 0db89fa243e5edc5de38c88b369e4c3755c5fb74 d3af83e327565a9444cebc0db714cb837e493046 git Not specified
CNA Linux Linux affected 0db89fa243e5edc5de38c88b369e4c3755c5fb74 c5a31b4e7e37c92550be9a2edf51ca853a4d251a git Not specified
CNA Linux Linux affected 0db89fa243e5edc5de38c88b369e4c3755c5fb74 a2151624b55029dad0ca7efd17fb83a0461c8843 git Not specified
CNA Linux Linux affected 0db89fa243e5edc5de38c88b369e4c3755c5fb74 6d4ed2fd022bc862b156e53aae163b61259e1caa git Not specified
CNA Linux Linux affected 0db89fa243e5edc5de38c88b369e4c3755c5fb74 15d2b7f38f95d28652170344f39ee492c55e567c git Not specified
CNA Linux Linux affected 0db89fa243e5edc5de38c88b369e4c3755c5fb74 ced45be0073a8a31b30b4a7f68cd3a15734515de git Not specified
CNA Linux Linux affected 5.17 Not specified
CNA Linux Linux unaffected 5.17 semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/15d2b7f38f95d28652170344f39ee492c55e567c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ced45be0073a8a31b30b4a7f68cd3a15734515de 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d3af83e327565a9444cebc0db714cb837e493046 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c5a31b4e7e37c92550be9a2edf51ca853a4d251a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a2151624b55029dad0ca7efd17fb83a0461c8843 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6d4ed2fd022bc862b156e53aae163b61259e1caa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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