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The parse-time validator stores only the option offset into IPCB / skb metadata. Later consumers (cmsg echo, mrouted report, netlabel getattr) re-read the length / pointer / cat_len bytes from the skb body and use them for indexed memcpy or bitmap walk. An nftables payload mutation reachable from an unprivileged user namespace (CAP_NET_ADMIN inside the namespace) rewrites those bytes between parse and consume. 1/4 __ip_options_echo() 40-byte stack OOB write (KASAN: stack-out-of-bounds, Write of size 255). 2/4 ipmr_cache_report() Up to 40-byte OOB read of skb head leaked into the IGMPMSG cmsg delivered to mrouted. 3/4 netlbl_skbuff_getattr() / CALIPSO ~232-byte slab OOB read driving SELinux/Smack MLS category bitmap. 4/4 netlbl_skbuff_getattr() / CIPSO Sibling of 3/4 on the AF_INET (CIPSO IPv4) path. Qi Tang (4): ipv4: validate ip_options length in __ip_options_echo() against skb tail ipv4: ipmr: clamp ip_hdrlen against skb_headlen in ipmr_cache_report netlabel: validate CALIPSO option against skb tail in netlbl_skbuff_getattr netlabel: validate CIPSO option against skb tail in netlbl_skbuff_getattr net/ipv4/ip_options.c | 8 ++++++++ net/ipv4/ipmr.c | 2 +- net/netlabel/netlabel_kapi.c | 27 +++++++++++++++++++++++---- 3 files changed, 32 insertions(+), 5 deletions(-) -- 2.47.3