CVE-2026-23456

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().

CVSS 3.1

8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 44% of CVEs (scores of 2026-10-25)

CWE

CWE-125

Published

2026-04-03

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/1e3a3593162c96e8a8de48b1e14f60c3b57fca8a
• https://git.kernel.org/stable/c/41b417ff73a24b2c68134992cc44c88db27f482d
• https://git.kernel.org/stable/c/52235bf88159a1ef16434ab49e47e99c8a09ab20
• https://git.kernel.org/stable/c/6bce72daeccca9aa1746e92d6c3d4784e71f2ebb
• https://git.kernel.org/stable/c/774a434f8c9c8602a976b2536f65d0172a07f4d2

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