CVE-2026-43458
serial: caif: hold tty->link reference in ldisc_open and ser_release
Description
In the Linux kernel, the following vulnerability has been resolved: serial: caif: hold tty->link reference in ldisc_open and ser_release A reproducer triggers a KASAN slab-use-after-free in pty_write_room() when caif_serial's TX path calls tty_write_room(). The faulting access is on tty->link->port. Hold an extra kref on tty->link for the lifetime of the caif_serial line discipline: get it in ldisc_open() and drop it in ser_release(), and also drop it on the ldisc_open() error path. With this change applied, the reproducer no longer triggers the UAF in my testing.
INFO
Published Date :
May 8, 2026, 3:16 p.m.
Last Modified :
May 8, 2026, 3:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-43458
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Apply the provided kernel patch.
- Ensure tty->link kref is managed properly.
- Test the fix to confirm UAF is resolved.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-43458.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43458 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43458
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-43458 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43458 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 08, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: serial: caif: hold tty->link reference in ldisc_open and ser_release A reproducer triggers a KASAN slab-use-after-free in pty_write_room() when caif_serial's TX path calls tty_write_room(). The faulting access is on tty->link->port. Hold an extra kref on tty->link for the lifetime of the caif_serial line discipline: get it in ldisc_open() and drop it in ser_release(), and also drop it on the ldisc_open() error path. With this change applied, the reproducer no longer triggers the UAF in my testing. Added Reference https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1 Added Reference https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98 Added Reference https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a Added Reference https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c Added Reference https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d Added Reference https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089 Added Reference https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7 Added Reference https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3