Vulnerability-Lookup

CVE-2026-93050 (GCVE-0-2026-93050)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:10 – Updated: 2026-09-17 16:10

Title

ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove

Summary

In the Linux kernel, the following vulnerability has been resolved: ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove Three issues arise when the device is removed while a tty session is still active: 1. UAF of struct ipoctal: the remove callback frees ipoctal via kfree() while tty ops may still access it. Fix by introducing kref-based lifetime management — kref is taken in install() when a tty is opened and released in cleanup() when the tty is finally destroyed; remove() uses kref_put() instead of kfree(). 2. NULL dereference in ipoctal_write_tty(): __ipoctal_remove() frees xmit_buf via tty_port_free_xmit_buf() while a userspace process may still hold the tty fd and call write(). Fix by checking for NULL xmit_buf in ipoctal_write_tty(). 3. UAF in ipoctal_cleanup(): ipack_put_carrier(ipoctal->dev) dereferences ipoctal->dev after the ipack_device has been freed by ipack_device_del(). Fix by caching ipoctal->carrier_owner during probe() and calling module_put() on the cached pointer directly in cleanup(), avoiding any access to ipoctal->dev. Also introduce a "removed" flag in struct ipoctal, set at the start of __ipoctal_remove(), and checked in every tty op that accesses hardware resources (port_activate, write_tty, set_termios, hangup, shutdown). This prevents page faults when devm_ioremap() regions are unmapped after remove() returns.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/ab5f5b27a340004b9…
https://git.kernel.org/stable/c/c92ef8fd834521f0b…
https://git.kernel.org/stable/c/a4613140f01bd0fb9…
https://git.kernel.org/stable/c/1a3258e105f711538…
https://git.kernel.org/stable/c/4a6518be316029650…
https://git.kernel.org/stable/c/b6b5d64cb161a2834…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 05e5027efc9c0bb6d1d04cde279afbafca0a7929 , < ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a (git) Affected: 05e5027efc9c0bb6d1d04cde279afbafca0a7929 , < c92ef8fd834521f0b788e0511976c689fe57c63c (git) Affected: 05e5027efc9c0bb6d1d04cde279afbafca0a7929 , < a4613140f01bd0fb9980e2746ed9aaa65a29b5d6 (git) Affected: 05e5027efc9c0bb6d1d04cde279afbafca0a7929 , < 1a3258e105f711538201bdd2ac2a05b11554eabc (git) Affected: 05e5027efc9c0bb6d1d04cde279afbafca0a7929 , < 4a6518be316029650301f2a5e8f0def229b895d9 (git) Affected: 05e5027efc9c0bb6d1d04cde279afbafca0a7929 , < b6b5d64cb161a28347d64dc3168a636c4abb68d5 (git)	guessed
Linux	Linux	Affected: 3.8 Unaffected: 0 , < 3.8 (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/ipack/devices/ipoctal.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            },
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "3.8"
            },
            {
              "lessThan": "3.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
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                },
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove\n\nThree issues arise when the device is removed while a tty session is\nstill active:\n\n1. UAF of struct ipoctal: the remove callback frees ipoctal via\n   kfree() while tty ops may still access it.  Fix by introducing\n   kref-based lifetime management \u2014 kref is taken in install() when\n   a tty is opened and released in cleanup() when the tty is finally\n   destroyed; remove() uses kref_put() instead of kfree().\n\n2. NULL dereference in ipoctal_write_tty(): __ipoctal_remove()\n   frees xmit_buf via tty_port_free_xmit_buf() while a userspace\n   process may still hold the tty fd and call write().  Fix by\n   checking for NULL xmit_buf in ipoctal_write_tty().\n\n3. UAF in ipoctal_cleanup(): ipack_put_carrier(ipoctal-\u003edev)\n   dereferences ipoctal-\u003edev after the ipack_device has been freed\n   by ipack_device_del().  Fix by caching ipoctal-\u003ecarrier_owner\n   during probe() and calling module_put() on the cached pointer\n   directly in cleanup(), avoiding any access to ipoctal-\u003edev.\n\nAlso introduce a \"removed\" flag in struct ipoctal, set at the start\nof __ipoctal_remove(), and checked in every tty op that accesses\nhardware resources (port_activate, write_tty, set_termios, hangup,\nshutdown).  This prevents page faults when devm_ioremap() regions\nare unmapped after remove() returns."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:10:40.360Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a"
        },
        {
          "url": "https://git.kernel.org/stable/c/c92ef8fd834521f0b788e0511976c689fe57c63c"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4613140f01bd0fb9980e2746ed9aaa65a29b5d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a3258e105f711538201bdd2ac2a05b11554eabc"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a6518be316029650301f2a5e8f0def229b895d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6b5d64cb161a28347d64dc3168a636c4abb68d5"
        }
      ],
      "title": "ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93050",
    "datePublished": "2026-09-17T16:10:40.360Z",
    "dateReserved": "2026-09-17T15:57:05.658Z",
    "dateUpdated": "2026-09-17T16:10:40.360Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/ipack/devices/ipoctal.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                  },
                  {
                    "lessThan": "c92ef8fd834521f0b788e0511976c689fe57c63c",
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                  {
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                    "versionType": "git"
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                    "versionType": "git"
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                  {
                    "lessThan": "4a6518be316029650301f2a5e8f0def229b895d9",
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                    "versionType": "git"
                  },
                  {
                    "lessThan": "b6b5d64cb161a28347d64dc3168a636c4abb68d5",
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                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
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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": "3.8"
                  },
                  {
                    "lessThan": "3.8",
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                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
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                    "version": "6.1.188",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.157",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.110",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.52",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
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                    "version": "7.2.6",
                    "versionType": "semver"
                  },
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                ]
              }
            ],
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          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove\n\nThree issues arise when the device is removed while a tty session is\nstill active:\n\n1. UAF of struct ipoctal: the remove callback frees ipoctal via\n   kfree() while tty ops may still access it.  Fix by introducing\n   kref-based lifetime management \u2014 kref is taken in install() when\n   a tty is opened and released in cleanup() when the tty is finally\n   destroyed; remove() uses kref_put() instead of kfree().\n\n2. NULL dereference in ipoctal_write_tty(): __ipoctal_remove()\n   frees xmit_buf via tty_port_free_xmit_buf() while a userspace\n   process may still hold the tty fd and call write().  Fix by\n   checking for NULL xmit_buf in ipoctal_write_tty().\n\n3. UAF in ipoctal_cleanup(): ipack_put_carrier(ipoctal-\u003edev)\n   dereferences ipoctal-\u003edev after the ipack_device has been freed\n   by ipack_device_del().  Fix by caching ipoctal-\u003ecarrier_owner\n   during probe() and calling module_put() on the cached pointer\n   directly in cleanup(), avoiding any access to ipoctal-\u003edev.\n\nAlso introduce a \"removed\" flag in struct ipoctal, set at the start\nof __ipoctal_remove(), and checked in every tty op that accesses\nhardware resources (port_activate, write_tty, set_termios, hangup,\nshutdown).  This prevents page faults when devm_ioremap() regions\nare unmapped after remove() returns."
          }
        ],
        "id": "CVE-2026-93050",
        "lastModified": "2026-09-17T17:17:58.367",
        "metrics": {},
        "published": "2026-09-17T17:17:58.367",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1a3258e105f711538201bdd2ac2a05b11554eabc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4a6518be316029650301f2a5e8f0def229b895d9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a4613140f01bd0fb9980e2746ed9aaa65a29b5d6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b6b5d64cb161a28347d64dc3168a636c4abb68d5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c92ef8fd834521f0b788e0511976c689fe57c63c"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-18T00:12:56Z",
      "cve": "CVE-2026-93050",
      "id": "CVE-2026-93050",
      "initial_release_date": "2026-09-18T00:12:56Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93050",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93050.json",
      "version": "2"
    }
  }
}

FKIE_CVE-2026-93050

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-17 17:17

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1a3258e105f711538201bdd2ac2a05b11554eabc
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4a6518be316029650301f2a5e8f0def229b895d9
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a4613140f01bd0fb9980e2746ed9aaa65a29b5d6
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b6b5d64cb161a28347d64dc3168a636c4abb68d5
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c92ef8fd834521f0b788e0511976c689fe57c63c

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/ipack/devices/ipoctal.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a",
              "status": "affected",
              "version": "05e5027efc9c0bb6d1d04cde279afbafca0a7929",
              "versionType": "git"
            },
            {
              "lessThan": "c92ef8fd834521f0b788e0511976c689fe57c63c",
              "status": "affected",
              "version": "05e5027efc9c0bb6d1d04cde279afbafca0a7929",
              "versionType": "git"
            },
            {
              "lessThan": "a4613140f01bd0fb9980e2746ed9aaa65a29b5d6",
              "status": "affected",
              "version": "05e5027efc9c0bb6d1d04cde279afbafca0a7929",
              "versionType": "git"
            },
            {
              "lessThan": "1a3258e105f711538201bdd2ac2a05b11554eabc",
              "status": "affected",
              "version": "05e5027efc9c0bb6d1d04cde279afbafca0a7929",
              "versionType": "git"
            },
            {
              "lessThan": "4a6518be316029650301f2a5e8f0def229b895d9",
              "status": "affected",
              "version": "05e5027efc9c0bb6d1d04cde279afbafca0a7929",
              "versionType": "git"
            },
            {
              "lessThan": "b6b5d64cb161a28347d64dc3168a636c4abb68d5",
              "status": "affected",
              "version": "05e5027efc9c0bb6d1d04cde279afbafca0a7929",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/ipack/devices/ipoctal.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.8"
            },
            {
              "lessThan": "3.8",
              "status": "unaffected",
              "version": "0",
              "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": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove\n\nThree issues arise when the device is removed while a tty session is\nstill active:\n\n1. UAF of struct ipoctal: the remove callback frees ipoctal via\n   kfree() while tty ops may still access it.  Fix by introducing\n   kref-based lifetime management \u2014 kref is taken in install() when\n   a tty is opened and released in cleanup() when the tty is finally\n   destroyed; remove() uses kref_put() instead of kfree().\n\n2. NULL dereference in ipoctal_write_tty(): __ipoctal_remove()\n   frees xmit_buf via tty_port_free_xmit_buf() while a userspace\n   process may still hold the tty fd and call write().  Fix by\n   checking for NULL xmit_buf in ipoctal_write_tty().\n\n3. UAF in ipoctal_cleanup(): ipack_put_carrier(ipoctal-\u003edev)\n   dereferences ipoctal-\u003edev after the ipack_device has been freed\n   by ipack_device_del().  Fix by caching ipoctal-\u003ecarrier_owner\n   during probe() and calling module_put() on the cached pointer\n   directly in cleanup(), avoiding any access to ipoctal-\u003edev.\n\nAlso introduce a \"removed\" flag in struct ipoctal, set at the start\nof __ipoctal_remove(), and checked in every tty op that accesses\nhardware resources (port_activate, write_tty, set_termios, hangup,\nshutdown).  This prevents page faults when devm_ioremap() regions\nare unmapped after remove() returns."
    }
  ],
  "id": "CVE-2026-93050",
  "lastModified": "2026-09-17T17:17:58.367",
  "metrics": {},
  "published": "2026-09-17T17:17:58.367",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1a3258e105f711538201bdd2ac2a05b11554eabc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4a6518be316029650301f2a5e8f0def229b895d9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a4613140f01bd0fb9980e2746ed9aaa65a29b5d6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b6b5d64cb161a28347d64dc3168a636c4abb68d5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c92ef8fd834521f0b788e0511976c689fe57c63c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-7QCC-HQRM-QFRJ

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32

Details

In the Linux kernel, the following vulnerability has been resolved:

ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove

Three issues arise when the device is removed while a tty session is still active:

UAF of struct ipoctal: the remove callback frees ipoctal via kfree() while tty ops may still access it. Fix by introducing kref-based lifetime management — kref is taken in install() when a tty is opened and released in cleanup() when the tty is finally destroyed; remove() uses kref_put() instead of kfree().
NULL dereference in ipoctal_write_tty(): __ipoctal_remove() frees xmit_buf via tty_port_free_xmit_buf() while a userspace process may still hold the tty fd and call write(). Fix by checking for NULL xmit_buf in ipoctal_write_tty().
UAF in ipoctal_cleanup(): ipack_put_carrier(ipoctal->dev) dereferences ipoctal->dev after the ipack_device has been freed by ipack_device_del(). Fix by caching ipoctal->carrier_owner during probe() and calling module_put() on the cached pointer directly in cleanup(), avoiding any access to ipoctal->dev.

Also introduce a "removed" flag in struct ipoctal, set at the start of __ipoctal_remove(), and checked in every tty op that accesses hardware resources (port_activate, write_tty, set_termios, hangup, shutdown). This prevents page faults when devm_ioremap() regions are unmapped after remove() returns.

Show details on source website

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To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-93050"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:58Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove\n\nThree issues arise when the device is removed while a tty session is\nstill active:\n\n1. UAF of struct ipoctal: the remove callback frees ipoctal via\n   kfree() while tty ops may still access it.  Fix by introducing\n   kref-based lifetime management \u2014 kref is taken in install() when\n   a tty is opened and released in cleanup() when the tty is finally\n   destroyed; remove() uses kref_put() instead of kfree().\n\n2. NULL dereference in ipoctal_write_tty(): __ipoctal_remove()\n   frees xmit_buf via tty_port_free_xmit_buf() while a userspace\n   process may still hold the tty fd and call write().  Fix by\n   checking for NULL xmit_buf in ipoctal_write_tty().\n\n3. UAF in ipoctal_cleanup(): ipack_put_carrier(ipoctal-\u003edev)\n   dereferences ipoctal-\u003edev after the ipack_device has been freed\n   by ipack_device_del().  Fix by caching ipoctal-\u003ecarrier_owner\n   during probe() and calling module_put() on the cached pointer\n   directly in cleanup(), avoiding any access to ipoctal-\u003edev.\n\nAlso introduce a \"removed\" flag in struct ipoctal, set at the start\nof __ipoctal_remove(), and checked in every tty op that accesses\nhardware resources (port_activate, write_tty, set_termios, hangup,\nshutdown).  This prevents page faults when devm_ioremap() regions\nare unmapped after remove() returns.",
  "id": "GHSA-7qcc-hqrm-qfrj",
  "modified": "2026-09-17T18:32:08Z",
  "published": "2026-09-17T18:32:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93050"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a3258e105f711538201bdd2ac2a05b11554eabc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a6518be316029650301f2a5e8f0def229b895d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4613140f01bd0fb9980e2746ed9aaa65a29b5d6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6b5d64cb161a28347d64dc3168a636c4abb68d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c92ef8fd834521f0b788e0511976c689fe57c63c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

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Nomenclature

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-93050 (GCVE-0-2026-93050)

FKIE_CVE-2026-93050

GHSA-7QCC-HQRM-QFRJ

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