CVE-2026-23456

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux5e35941d990123f155b02d5663e51a24f816b6f3 < a2cd54b9348e485d338b3c132338a4410c99afafaffected
LinuxLinux5e35941d990123f155b02d5663e51a24f816b6f3 < c95dc674ebf01ecfb40388b6facfc89b81fed3b7affected
LinuxLinux5e35941d990123f155b02d5663e51a24f816b6f3 < 41b417ff73a24b2c68134992cc44c88db27f482daffected
LinuxLinux5e35941d990123f155b02d5663e51a24f816b6f3 < 52235bf88159a1ef16434ab49e47e99c8a09ab20affected
LinuxLinux5e35941d990123f155b02d5663e51a24f816b6f3 < 774a434f8c9c8602a976b2536f65d0172a07f4d2affected
LinuxLinux5e35941d990123f155b02d5663e51a24f816b6f3 < 6bce72daeccca9aa1746e92d6c3d4784e71f2ebbaffected
LinuxLinux5e35941d990123f155b02d5663e51a24f816b6f3 < fb6c3596823ec5dd09c2123340330d7448f51a59affected
LinuxLinux5e35941d990123f155b02d5663e51a24f816b6f3 < 1e3a3593162c96e8a8de48b1e14f60c3b57fca8aaffected
LinuxLinux2.6.17affected
LinuxLinux0 < 2.6.17unaffected
LinuxLinux5.10.253 <= 5.10.*unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.167 <= 6.1.*unaffected
LinuxLinux6.6.130 <= 6.6.*unaffected
LinuxLinux6.12.78 <= 6.12.*unaffected
LinuxLinux6.18.20 <= 6.18.*unaffected
LinuxLinux6.19.10 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References