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

Type: advisorySource: Official CVE List1 source record

In 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.

Announced Source revision 1
Original source ↗

CVE-2026-89587

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89587

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "0db89fa243e5edc5de38c88b369e4c3755c5fb74",
        "lessThan": "d3af83e327565a9444cebc0db714cb837e493046",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0db89fa243e5edc5de38c88b369e4c3755c5fb74",
        "lessThan": "c5a31b4e7e37c92550be9a2edf51ca853a4d251a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0db89fa243e5edc5de38c88b369e4c3755c5fb74",
        "lessThan": "a2151624b55029dad0ca7efd17fb83a0461c8843",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0db89fa243e5edc5de38c88b369e4c3755c5fb74",
        "lessThan": "6d4ed2fd022bc862b156e53aae163b61259e1caa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0db89fa243e5edc5de38c88b369e4c3755c5fb74",
        "lessThan": "15d2b7f38f95d28652170344f39ee492c55e567c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0db89fa243e5edc5de38c88b369e4c3755c5fb74",
        "lessThan": "ced45be0073a8a31b30b4a7f68cd3a15734515de",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/acpi/pfr_update.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.17"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.17",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/acpi/pfr_update.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89587

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#35095 · Revision 1
Added to Heist Feed
Publisher date
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