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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-93050

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-2026-93050

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": "05e5027efc9c0bb6d1d04cde279afbafca0a7929",
        "lessThan": "ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "05e5027efc9c0bb6d1d04cde279afbafca0a7929",
        "lessThan": "c92ef8fd834521f0b788e0511976c689fe57c63c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "05e5027efc9c0bb6d1d04cde279afbafca0a7929",
        "lessThan": "a4613140f01bd0fb9980e2746ed9aaa65a29b5d6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "05e5027efc9c0bb6d1d04cde279afbafca0a7929",
        "lessThan": "1a3258e105f711538201bdd2ac2a05b11554eabc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "05e5027efc9c0bb6d1d04cde279afbafca0a7929",
        "lessThan": "4a6518be316029650301f2a5e8f0def229b895d9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "05e5027efc9c0bb6d1d04cde279afbafca0a7929",
        "lessThan": "b6b5d64cb161a28347d64dc3168a636c4abb68d5",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/ipack/devices/ipoctal.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.8",
        "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": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/ipack/devices/ipoctal.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93050

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#37787 · Revision 1
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Publisher date
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