Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_nat: reject unsupported target families xt_nat SNAT and DNAT target handlers assume IP-family conntrack state is present and can dereference a NULL pointer when instantiated from an unsupported family through nft_compat. A bridge-family compat rule can therefore trigger a NULL-dereference in nf_nat_setup_info(). Reject non-IP families in xt_nat_checkentry() so unsupported targets cannot be installed. Keep NFPROTO_INET allowed for valid inet NAT compat users and leave the runtime fast path unchanged. [ The crash was fixed via 9dbba7e694ec ("netfilter: nft_compat: ebtables emulation must reject non-bridge targets"), so this patch is no longer critical. Nevertheless, NAT is only relevant for ipv4/ipv6, so this extra family check is a good idea in any case. ]
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
c7232c9979cba684c50b64c513c4a83c9aa70563 to < 49abe564391411057a26a9a943c8e17867c3b9b4affectedc7232c9979cba684c50b64c513c4a83c9aa70563 to < 0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82affectedc7232c9979cba684c50b64c513c4a83c9aa70563 to < 4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777affectedc7232c9979cba684c50b64c513c4a83c9aa70563 to < a842dab87cab29f2a5798a47b2dc5e6a449950bfaffectedc7232c9979cba684c50b64c513c4a83c9aa70563 to < e35c048d7511e9d4c2a537b8a231c49606e97c16affectedc7232c9979cba684c50b64c513c4a83c9aa70563 to < 679ced28a9dc2f6dc679eb05027d779693e60902affectedc7232c9979cba684c50b64c513c4a83c9aa70563 to < ec88fa71c82072e9189983b05b499d3507550271affectedc7232c9979cba684c50b64c513c4a83c9aa70563 to < 5d1a2240935ea47e2673d0ea17fdb058e4dc91ddaffected
Linux Linux
Default version status: affected
3.7affected0 to < 3.7unaffected5.10.261 to ≤ 5.10.*unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.97 to ≤ 6.12.*unaffected6.18.40 to ≤ 6.18.*unaffected7.1.5 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/49abe564391411057a26a9a943c8e17867c3b9b4 ↗
- https://git.kernel.org/stable/c/0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82 ↗
- https://git.kernel.org/stable/c/4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777 ↗
- https://git.kernel.org/stable/c/a842dab87cab29f2a5798a47b2dc5e6a449950bf ↗
- https://git.kernel.org/stable/c/e35c048d7511e9d4c2a537b8a231c49606e97c16 ↗
- https://git.kernel.org/stable/c/679ced28a9dc2f6dc679eb05027d779693e60902 ↗
- https://git.kernel.org/stable/c/ec88fa71c82072e9189983b05b499d3507550271 ↗
- https://git.kernel.org/stable/c/5d1a2240935ea47e2673d0ea17fdb058e4dc91dd ↗