CVE-2026-89466 (GCVE-0-2026-89466)
Vulnerability from cvelistv5
Published
2026-09-11 19:43
Modified
2026-10-19 08:47
Severity ?
7.7 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: power: supply: qcom_battmgr: terminate the strings from firmware The qcom_battmgr_sc8280xp_strcpy() takes a Pascal-style string when the firmware sends one. Otherwise it copies all BATTMGR_STRING_LEN bytes and leaves the destination without a terminator. Those destinations are model_number, serial_number and oem_info, each BATTMGR_STRING_LEN and declared next to each other. They go out to user space as val->strval, which power_supply_format_property() prints with "%s", so a firmware string that fills the whole field makes that read run into the following members. Use strscpy() so the copy always terminates, the way the SM8350 path already does for the same field.
References
Impacted products
Vendor Product Version
Linux Linux Version: 29e8142b5623b5949587bcc4f591c4e6595c4aca
Version: 29e8142b5623b5949587bcc4f591c4e6595c4aca
Version: 29e8142b5623b5949587bcc4f591c4e6595c4aca
Version: 29e8142b5623b5949587bcc4f591c4e6595c4aca
Version: 29e8142b5623b5949587bcc4f591c4e6595c4aca
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/power/supply/qcom_battmgr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/power/supply/qcom_battmgr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npower: supply: qcom_battmgr: terminate the strings from firmware\n\nThe qcom_battmgr_sc8280xp_strcpy() takes a Pascal-style string when the\nfirmware sends one. Otherwise it copies all BATTMGR_STRING_LEN bytes and\nleaves the destination without a terminator.\n\nThose destinations are model_number, serial_number and oem_info, each\nBATTMGR_STRING_LEN and declared next to each other. They go out to user\nspace as val-\u003estrval, which power_supply_format_property() prints with\n\"%s\", so a firmware string that fills the whole field makes that read run\ninto the following members.\n\nUse strscpy() so the copy always terminates, the way the SM8350 path\nalready does for the same field."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The unterminated copies run in qcom_battmgr_sc8280xp_callback() on BATTMGR_BAT_INFO payloads received over on-SoC PMIC GLINK/rpmsg from the Qualcomm ADSP/SOCCP (PMIC_RTR_ADSP_APPS), not from a network protocol, Bluetooth, or a pluggable USB device.\nAC:L - Firmware fully controls the 128-byte model_number, serial_number, and oem_info fields; sending 128 non-NUL bytes (or a first byte that is not a Pascal length) always takes the memcpy() path that omits the terminator, with no race or attacker-uncontrollable layout.\nPR:N - pmic_glink_rpmsg_callback delivers ADSP/SOCCP payloads to qcom_battmgr_callback with no Linux credential or capability check, so compromised PMIC firmware can send BATTMGR_BAT_INFO and NOTIF_BAT_INFO without a host account.\nUI:N - Battery-info parsing and power_supply_changed() uevents run from the GLINK response/notification path and from automatic sysfs/uevent reads at boot; no victim must open a file, mount a filesystem, or take any other action.\nS:U - The over-read stays in host kernel memory around struct qcom_battmgr in the same OS security authority; this is ordinary kernel disclosure or denial of service, not a VM escape, IOMMU bypass, or sandbox breakout.\nC:H - Unterminated model_number, serial_number, and oem_info are printed with %s via world-readable power_supply sysfs and uevents; kernel vsnprintf scans until a NUL, an unbounded out-of-bounds read of adjacent kernel fields and pointers.\nI:N - qcom_battmgr_sc8280xp_strcpy() copies exactly BATTMGR_STRING_LEN bytes into same-sized destinations; the defect is a missing terminator that causes over-reads, not an out-of-bounds write, use-after-free, or control-flow hijack primitive.\nA:H - Unbounded %s scanning of those unterminated fields can walk past the kmalloc-backed qcom_battmgr object into unmapped pages, causing a kernel oops or panic, and firmware can retrigger the path through GLINK notifications."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:47:15.439Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c06028db620854b11ad81b04b0a4e1ead930cb76"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e70a9b0d16acf7adebc4f386178a95da27c0027"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee053561e21ce1e1741dd64ca5ddcdb92e40edc1"
        },
        {
          "url": "https://git.kernel.org/stable/c/6cc6c28c9ab6e8ecf901397717a5b391b828cdaf"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab1112df8f4ffa88cb024dd370c432ced80f77d8"
        }
      ],
      "title": "power: supply: qcom_battmgr: terminate the strings from firmware",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89466",
    "datePublished": "2026-09-11T19:43:26.621Z",
    "dateReserved": "2026-09-11T19:38:34.709Z",
    "dateUpdated": "2026-10-19T08:47:15.439Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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