CVE-2026-23456

HIGH

netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case

Title source: cna
STIX 2.1

Description

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().

Scores

CVSS v3 8.2
EPSS 0.0007
EPSS Percentile 22.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Details

Status published
Products (19)
Linux/Linux < 2.6.17
Linux/Linux 2.6.17
Linux/Linux 5.10.253 - 5.10.*
Linux/Linux 5.15.203 - 5.15.*
Linux/Linux 5e35941d990123f155b02d5663e51a24f816b6f3 - 1e3a3593162c96e8a8de48b1e14f60c3b57fca8a
Linux/Linux 5e35941d990123f155b02d5663e51a24f816b6f3 - 41b417ff73a24b2c68134992cc44c88db27f482d
Linux/Linux 5e35941d990123f155b02d5663e51a24f816b6f3 - 52235bf88159a1ef16434ab49e47e99c8a09ab20
Linux/Linux 5e35941d990123f155b02d5663e51a24f816b6f3 - 6bce72daeccca9aa1746e92d6c3d4784e71f2ebb
Linux/Linux 5e35941d990123f155b02d5663e51a24f816b6f3 - 774a434f8c9c8602a976b2536f65d0172a07f4d2
Linux/Linux 5e35941d990123f155b02d5663e51a24f816b6f3 - a2cd54b9348e485d338b3c132338a4410c99afaf
... and 9 more
Published Apr 03, 2026
Tracked Since Apr 03, 2026