8.2 High

CVE-2026-23456 In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: fix OOB read in…

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().

Affected products and versions

Product	Affected versions	Fixed in
Linux 7.0	earliest → < 7.0	7.0
Linux 6.19	earliest → < 6.19.10	6.19.10
Linux 6.18	earliest → < 6.18.20	6.18.20
Linux 6.12	earliest → < 6.12.78	6.12.78
Linux 6.6	earliest → < 6.6.130	6.6.130
Linux 6.1	earliest → < 6.1.167	6.1.167
Linux 5.15	earliest → < 5.15.203	5.15.203
Linux 5.10	earliest → < 5.10.253	5.10.253
Linux	2.6.17	No fix stated

Show the 3 other branches

Product	Affected versions	Fixed in
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated