CVE-2026-23456
HIGHnetfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case
Title source: cnaDescription
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case In decode_int(), the CONS case calls get_bits(bs, 2) to read a length value, then calls get_uint(bs, len) without checking that len bytes remain in the buffer. The existing boundary check only validates the 2 bits for get_bits(), not the subsequent 1-4 bytes that get_uint() reads. This allows a malformed H.323/RAS packet to cause a 1-4 byte slab-out-of-bounds read. Add a boundary check for len bytes after get_bits() and before get_uint().
References (10)
Core 10
Core References
Vendor Advisory
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
Vendor Advisory
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
Scores
CVSS v3
8.2
EPSS
0.0052
EPSS Percentile
40.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Details
CWE
CWE-125
Status
published
Products (28)
linux/Kernel
2.6.17 - 5.10.253linux
linux/Kernel
5.11.0 - 5.15.203linux
linux/Kernel
5.16.0 - 6.1.167linux
linux/Kernel
6.13.0 - 6.18.20linux
linux/Kernel
6.19.0 - 6.19.10linux
linux/Kernel
6.2.0 - 6.6.130linux
linux/Kernel
6.7.0 - 6.12.78linux
Linux/Linux
< 2.6.17
Linux/Linux
2.6.17
Linux/Linux
5.10.253 - 5.10.*
... and 18 more
Published
Apr 03, 2026
Tracked Since
Apr 03, 2026