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CVE-2026-89721 (GCVE-0-2026-89721)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-11 19:46
VLAI
Title
phy: rockchip-samsung-dcphy: fix out-of-range max_register
Summary
In the Linux kernel, the following vulnerability has been resolved: phy: rockchip-samsung-dcphy: fix out-of-range max_register The PHY register block is 64KB, so with a register stride of 4 the last accessible register sits at offset 0xfffc. max_register names 0x10000, one register past the end of the mapping: dumping the registers through the regmap debugfs interface reads beyond the ioremapped region and oopses on the unmapped page. The oops fires with the regmap lock held, so later PHY operations deadlock.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b2a1a2ae7818c9d8da12bf7b1983c8b9f5fb712b , < 14afe18655c0951f4f85898f761bf92264e65ccd (git)
Affected: b2a1a2ae7818c9d8da12bf7b1983c8b9f5fb712b , < c1a62f9dcf531d56c56da2e4435386b6d264c69f (git)
Affected: b2a1a2ae7818c9d8da12bf7b1983c8b9f5fb712b , < 4486e75ba647bd8b98fc1f053101b40caceeed4b (git)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c"
          ],
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              "versionType": "git"
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.15"
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            },
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      "cpeApplicability": [
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nphy: rockchip-samsung-dcphy: fix out-of-range max_register\n\nThe PHY register block is 64KB, so with a register stride of 4 the\nlast accessible register sits at offset 0xfffc. max_register names\n0x10000, one register past the end of the mapping: dumping the\nregisters through the regmap debugfs interface reads beyond the\nioremapped region and oopses on the unmapped page. The oops fires\nwith the regmap lock held, so later PHY operations deadlock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-11T19:46:33.680Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/14afe18655c0951f4f85898f761bf92264e65ccd"
        },
        {
          "url": "https://git.kernel.org/stable/c/c1a62f9dcf531d56c56da2e4435386b6d264c69f"
        },
        {
          "url": "https://git.kernel.org/stable/c/4486e75ba647bd8b98fc1f053101b40caceeed4b"
        }
      ],
      "title": "phy: rockchip-samsung-dcphy: fix out-of-range max_register",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89721",
    "datePublished": "2026-09-11T19:46:33.680Z",
    "dateReserved": "2026-09-11T19:38:34.752Z",
    "dateUpdated": "2026-09-11T19:46:33.680Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-09-15",
      "epss": "0.00198",
      "percentile": "0.09745"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-15T05:08:28+00:00",
      "cve": "CVE-2026-89721",
      "id": "CVE-2026-89721",
      "initial_release_date": "2026-09-11T19:46:33.680000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: `rockchip-samsung-dcphy` out-of-bounds read leads to denial of service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89721.json",
      "version": "3"
    }
  }
}



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