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Vulnerability record · CVE-2026-43458 · published 8 May 2026

CVE-2026-43458: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.17% · top 94.2% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1 Patch
https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98 Patch
https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a Patch
https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c Patch
https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d Patch
https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089 Patch
https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7 Patch
https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-43458), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.