CVE-2026-43458

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Source
https://cve.org/CVERecord?id=CVE-2026-43458
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43458.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-43458
Downstream
Published
2026-05-08T14:22:21.997Z
Modified
2026-07-15T01:49:16.017757200Z
Summary
serial: caif: hold tty->link reference in ldisc_open and ser_release
Details

In the Linux kernel, the following vulnerability has been resolved:

serial: caif: hold tty->link reference in ldiscopen and serrelease

A reproducer triggers a KASAN slab-use-after-free in ptywriteroom() when caifserial's TX path calls ttywrite_room(). The faulting access is on tty->link->port.

Hold an extra kref on tty->link for the lifetime of the caifserial line discipline: get it in ldiscopen() and drop it in serrelease(), and also drop it on the ldiscopen() error path.

With this change applied, the reproducer no longer triggers the UAF in my testing.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43458.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
e31d5a05948e4478ba8396063d1e1f39880928e2
Fixed
23a3ac2e2262a291498567418227b99e1f3606b1
Fixed
52135420e9f75853ea0c6cea7b736e3e98495f7d
Fixed
ca2ceba983bb23ea0202c2882d963253416654a3
Fixed
8460187b4852fd00bd1c76394358053f3fa4d089
Fixed
27e43356d0defb9fc7fa25265219a3ffeb7b3e98
Fixed
35b58d3bc716ebb9ebd10fe1cac8c1177242511c
Fixed
97a0bb491cae39478c6225381f14e9ac67b7bba7
Fixed
288598d80a068a0e9281de35bcb4ce495f189e2a

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43458.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.6.35
Fixed
5.10.253
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.203
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.167
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.130
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.78
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.19
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
6.19.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43458.json"