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

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().

Timeline

1. Apr 3, 2026, 3:15 PM UTCCVE published
2. Oct 16, 2026, 3:08 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Oct 19, 2026, 6:35 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 5e35941d990123f155b02d5663e51a24f816b6f3 · fixed in a2cd54b9348e485d338b3c132338a4410c99afaf; From 5e35941d990123f155b02d5663e51a24f816b6f3 · fixed in c95dc674ebf01ecfb40388b6facfc89b81fed3b7; From 5e35941d990123f155b02d5663e51a24f816b6f3 · fixed in 41b417ff73a24b2c68134992cc44c88db27f482d; From 5e35941d990123f155b02d5663e51a24f816b6f3 · fixed in 52235bf88159a1ef16434ab49e47e99c8a09ab20; From 5e35941d990123f155b02d5663e51a24f816b6f3 · fixed in 774a434f8c9c8602a976b2536f65d0172a07f4d2; From 5e35941d990123f155b02d5663e51a24f816b6f3 · fixed in 6bce72daeccca9aa1746e92d6c3d4784e71f2ebb; From 5e35941d990123f155b02d5663e51a24f816b6f3 · fixed in fb6c3596823ec5dd09c2123340330d7448f51a59; From 5e35941d990123f155b02d5663e51a24f816b6f3 · fixed in 1e3a3593162c96e8a8de48b1e14f60c3b57fca8a

• Linux Linux

  2.6.17

• KernelLinux

  From 2.6.17 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.130; From 6.7.0 · fixed in 6.12.78; From 6.13.0 · fixed in 6.18.20; From 6.19.0 · fixed in 6.19.10

References 8