CVE-2026-89597 (GCVE-0-2026-89597)
Vulnerability from cvelistv5
Published
2026-09-11 19:44
Modified
2026-10-19 08:49
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: fbdev: uvesafb: unregister connector callback on init failure uvesafb_init() registers the v86d connector callback before registering the platform driver. If platform_driver_register() fails, the function returns the error directly and leaves the connector callback registered. The later platform-device failure path already unregisters the callback. Add the same cleanup before the final return when platform-driver registration fails. This issue was identified during our ongoing static-analysis research while reviewing kernel code.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8bdb3a2d7df48b861972c4bfb58490853a228f51
Version: 8bdb3a2d7df48b861972c4bfb58490853a228f51
Version: 8bdb3a2d7df48b861972c4bfb58490853a228f51
Version: 8bdb3a2d7df48b861972c4bfb58490853a228f51
Version: 8bdb3a2d7df48b861972c4bfb58490853a228f51
Version: 8bdb3a2d7df48b861972c4bfb58490853a228f51
Version: 8bdb3a2d7df48b861972c4bfb58490853a228f51
Version: 8bdb3a2d7df48b861972c4bfb58490853a228f51
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/uvesafb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.24"
            },
            {
              "lessThan": "2.6.24",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "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": "5.10.270",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
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                  "versionEndExcluding": "5.15.221",
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                  "vulnerable": true
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
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                },
                {
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                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: uvesafb: unregister connector callback on init failure\n\nuvesafb_init() registers the v86d connector callback before registering\nthe platform driver. If platform_driver_register() fails, the function\nreturns the error directly and leaves the connector callback registered.\n\nThe later platform-device failure path already unregisters the callback.\nAdd the same cleanup before the final return when platform-driver\nregistration fails.\n\nThis issue was identified during our ongoing static-analysis research while\nreviewing kernel code."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The leftover v86d connector callback is reached only via a local NETLINK_CONNECTOR socket: cn_rx_skb() -\u003e cn_call_callback() invokes the registered handler. There is no remote packet, Bluetooth/WiFi, or USB path into this code.\nAC:L - Once platform_driver_register() fails, cn_add_callback() has already left uvesafb_cn_callback on the global connector list while free_module() unmaps the driver. A single NETLINK_CONNECTOR message with CN_IDX_V86D/CN_VAL_V86D_UVESAFB then calls that stale pointer with no race or other condition beyond the attacker\u0027s control.\nPR:L - Unprivileged users may create NETLINK_CONNECTOR sockets and send to kernel portid 0 without CAP_NET_ADMIN. The callback\u0027s capable(CAP_SYS_ADMIN) check never runs because the UAF occurs at the call through the freed module text, so init-namespace root is not required.\nUI:N - The attacker sends the netlink message from their own process. No separate victim action such as mounting a filesystem, opening a device node, or loading a module is required to hit the dangling callback.\nS:U - The stale function pointer and freed uvesafb module memory are kernel-side resources in the same security authority. This is local privilege escalation, not VM escape, IOMMU bypass, or another cross-boundary impact.\nC:H - The leftover cn_callback_entry still points at uvesafb_cn_callback in freed module text. That use-after-free lets an attacker reclaim the pages and obtain an arbitrary kernel read primitive.\nI:H - Calling through a function pointer that resides in freed module memory is a control-flow hijack once those pages are reallocated, giving an arbitrary write and code-execution primitive.\nA:H - Invoking the stale connector callback jumps into unmapped or reused module text and reliably oopses or panics the kernel even if the attacker does not fully exploit the UAF."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:49:29.665Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b149f77d04082a9da75944cdc488becb0e35258f"
        },
        {
          "url": "https://git.kernel.org/stable/c/0352fdac3cbf11e3b323322ff8cd95e20cbf5cd7"
        },
        {
          "url": "https://git.kernel.org/stable/c/17518e7123f7ef01b1155064dc01f2087583908e"
        },
        {
          "url": "https://git.kernel.org/stable/c/9eb7b3cbe99c9c0edbff69eb155c723e30983c22"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f8a822b44c42502f105cf6574f4867067eecdd0"
        },
        {
          "url": "https://git.kernel.org/stable/c/466a8af0dee2cf745307155e26884e19a37b7e15"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e768ae51426af2034d479133cfd73010d641b1a"
        },
        {
          "url": "https://git.kernel.org/stable/c/de8db23aa7c337e606fca9faf48b3ba72968597a"
        }
      ],
      "title": "fbdev: uvesafb: unregister connector callback on init failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89597",
    "datePublished": "2026-09-11T19:44:59.538Z",
    "dateReserved": "2026-09-11T19:38:34.731Z",
    "dateUpdated": "2026-10-19T08:49:29.665Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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