ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove
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.
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
- Added to Heist Feed
- Publisher date