CVE-2026-53306

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Source
https://cve.org/CVERecord?id=CVE-2026-53306
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53306.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-53306
Downstream
Published
2026-06-26T19:41:01.338Z
Modified
2026-07-15T01:49:08.722161479Z
Summary
tty: hvc_iucv: fix off-by-one in number of supported devices
Details

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

tty: hvc_iucv: fix off-by-one in number of supported devices

MAXHVCIUCVLINES == HVCALLOCTTYADAPTERS == 8. This is the number of entries in: static struct hvciucvprivate *hvciucvtable[MAXHVCIUCV_LINES];

Sometimes hvciucvtable[] is limited by: (a) if (num > hvciucvdevices) // for error detection or (b) for (i = 0; i < hvciucvdevices; i++) // in 2 places (so these 2 don't agree; second one appears to be correct to me.)

hvciucvdevices can be 0..8. This is a counter. (c) if (hvciucvdevices > MAXHVCIUCV_LINES)

If hvciucvdevices == 8, (a) allows the code to access hvciucvtable[8]. Oops.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53306.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
44a01d5ba8a4d543694461cd3e178cfa6b3f221b
Fixed
3d3b89e6ab93bdd0efd45828bda6b0e61cc46dff
Fixed
484357dff256c816d9466bda35eb765685e4dc86
Fixed
11207e42a332eb8bbcb9fe74df9edd2a807c5607
Fixed
fed8b8f33a46db0ee2efdb000f4f630c86ed8ca4
Fixed
a76511bc654819425d3b15e77b523d7f9d81f064
Fixed
3104a3f40feb107f77d7116ad9bf6c210ab7babf
Fixed
f1dc8e72de9aabe5d96767a4e97219ac26b79fe5
Fixed
f2a880e802ad12d1e38039d1334fb1475d0f5241

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53306.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.6.29
Fixed
5.10.258
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.209
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.175
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.141
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.91
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.33
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.0.10

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53306.json"