Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2026-43458

Severity CVSS v4.0:
Pending analysis
Type:
CWE-416 Use After Free
Publication date:
08/05/2026
Last modified:
21/05/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> serial: caif: hold tty-&gt;link reference in ldisc_open and ser_release<br /> <br /> A reproducer triggers a KASAN slab-use-after-free in pty_write_room()<br /> when caif_serial&amp;#39;s TX path calls tty_write_room(). The faulting access<br /> is on tty-&gt;link-&gt;port.<br /> <br /> Hold an extra kref on tty-&gt;link for the lifetime of the caif_serial line<br /> discipline: get it in ldisc_open() and drop it in ser_release(), and<br /> also drop it on the ldisc_open() error path.<br /> <br /> With this change applied, the reproducer no longer triggers the UAF in<br /> my testing.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
7.80
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 2.6.35 (including) 5.10.253 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.15.203 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.16 (including) 6.1.167 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.2 (including) 6.6.130 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.7 (including) 6.12.78 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.13 (including) 6.18.19 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.19 (including) 6.19.9 (excluding)
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools