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CVE-2026-23456

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

Description (CNA)

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 (CNA)

Vendor / productVersions
Linux / Linuxaffected 5e35941d990123f155b02d5663e51a24f816b6f3 before a2cd54b9348e485d338b3c132338a4410c99afaf; affected 5e35941d990123f155b02d5663e51a24f816b6f3 before c95dc674ebf01ecfb40388b6facfc89b81fed3b7; affected 5e35941d990123f155b02d5663e51a24f816b6f3 before 41b417ff73a24b2c68134992cc44c88db27f482d; affected 5e35941d990123f155b02d5663e51a24f816b6f3 before 52235bf88159a1ef16434ab49e47e99c8a09ab20; affected 5e35941d990123f155b02d5663e51a24f816b6f3 before 774a434f8c9c8602a976b2536f65d0172a07f4d2; affected 5e35941d990123f155b02d5663e51a24f816b6f3 before 6bce72daeccca9aa1746e92d6c3d4784e71f2ebb; affected 5e35941d990123f155b02d5663e51a24f816b6f3 before fb6c3596823ec5dd09c2123340330d7448f51a59; affected 5e35941d990123f155b02d5663e51a24f816b6f3 before 1e3a3593162c96e8a8de48b1e14f60c3b57fca8a
Linux / Linuxaffected 2.6.17; unaffected 0 before 2.6.17; unaffected 5.10.253 through 5.10.*; unaffected 5.15.203 through 5.15.*; unaffected 6.1.167 through 6.1.*; unaffected 6.6.130 through 6.6.*; unaffected 6.12.78 through 6.12.*; unaffected 6.18.20 through 6.18.*; unaffected 6.19.10 through 6.19.*; unaffected 7.0 through *

CWE

No CWE identifiers supplied.

References

ADP enrichment

siemens-SADP

No English description supplied.

CISA-ADP

No English description supplied.

No references supplied.