CVE-2026-43458

HIGH EPSS 1.9%
Published May 8, 20261mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published May 8, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
1.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 10

VendorProductVersionRange
linuxlinux_kernel*≥2.6.35  –  <5.10.253
linuxlinux_kernel*≥5.11  –  <5.15.203
linuxlinux_kernel*≥5.16  –  <6.1.167
linuxlinux_kernel*≥6.2  –  <6.6.130
linuxlinux_kernel*≥6.7  –  <6.12.78
linuxlinux_kernel*≥6.13  –  <6.18.19
linuxlinux_kernel*≥6.19  –  <6.19.9
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 8

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

Remediation

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