In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO nf_osf_match_one() computes ctx->window % f->wss.val in the OSF_WSS_MODULO branch with no guard for f->wss.val == 0. A CAP_NET_ADMIN user can add such a fingerprint via nfnetlink; a subsequent matching TCP SYN divides by zero and panics the kernel. Reject the bogus fingerprint in nfnl_osf_add_callback() above the per-option for-loop. f->wss is per-fingerprint, not per-option, so the check must run regardless of f->opt_num (including 0). Also reject wss.wc >= OSF_WSS_MAX; nf_osf_match_one() already treats that as "should not happen". Crash: Oops: divide error: 0000 [#1] SMP KASAN NOPTI RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98) Call Trace: <IRQ> nf_osf_match (net/netfilter/nfnetlink_osf.c:220) xt_osf_match_packet (net/netfilter/xt_osf.c:32) ipt_do_table (net/ipv4/netfilter/ip_tables.c:348) nf_hook_slow (net/netfilter/core.c:622) ip_local_deliver (net/ipv4/ip_input.c:265) ip_rcv (include/linux/skbuff.h:1162) __netif_receive_skb_one_core (net/core/dev.c:6181) process_backlog (net/core/dev.c:6642) __napi_poll (net/core/dev.c:7710) net_rx_action (net/core/dev.c:7945) handle_softirqs (kernel/softirq.c:622)
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO nf_osf_match_one() computes ctx->window % f->wss.val in the OSF_WSS_MODULO branch with no guard for f->wss.val == 0. A CAP_NET_ADMIN user can add such a fingerprint via nfnetlink; a subsequent matching TCP SYN divides by zero and panics the kernel. Reject the bogus fingerprint in nfnl_osf_add_callback() above the per-option for-loop. f->wss is per-fingerprint, not per-option, so the check must run regardless of f->opt_num (including 0). Also reject wss.wc >= OSF_WSS_MAX; nf_osf_match_one() already treats that as "should not happen". Crash: Oops: divide error: 0000 [#1] SMP KASAN NOPTI RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98) Call Trace: <IRQ> nf_osf_match (net/netfilter/nfnetlink_osf.c:220) xt_osf_match_packet (net/netfilter/xt_osf.c:32) ipt_do_table (net/ipv4/netfilter/ip_tables.c:348) nf_hook_slow (net/netfilter/core.c:622) ip_local_deliver (net/ipv4/ip_input.c:265) ip_rcv (include/linux/skbuff.h:1162) __netif_receive_skb_one_core (net/core/dev.c:6181) process_backlog (net/core/dev.c:6642) __napi_poll (net/core/dev.c:7710) net_rx_action (net/core/dev.c:7945) handle_softirqs (kernel/softirq.c:622)
Update Linux/Linux to cb833bbc1b3c51e08652d3c86298307c07d3f2db if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scannetfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO affects Linux/Linux (generic), Linux/Linux (generic). Severity is medium. In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO nf_osf_match_one() computes ctx->window % f->wss.val in the OSF_WSS_MODULO branch with no guard for f->wss.val == 0. A CAP_NET_ADMIN user can add such a fingerprint via nfnetlink; a subsequent matching TCP SYN divides by zero and panics the kernel. Reject the bogus fingerprint in nfnl_osf_add_callback() above the per-option for-loop. f->wss is per-fingerprint, not per-option, so the check must run regardless of f->opt_num (including 0). Also reject wss.wc >= OSF_WSS_MAX; nf_osf_match_one() already treats that as "should not happen". Crash: Oops: divide error: 0000 [#1] SMP KASAN NOPTI RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98) Call Trace: <IRQ> nf_osf_match (net/netfilter/nfnetlink_osf.c:220) xt_osf_match_packet (net/netfilter/xt_osf.c:32) ipt_do_table (net/ipv4/netfilter/ip_tables.c:348) nf_hook_slow (net/netfilter/core.c:622) ip_local_deliver (net/ipv4/ip_input.c:265) ip_rcv (include/linux/skbuff.h:1162) __netif_receive_skb_one_core (net/core/dev.c:6181) process_backlog (net/core/dev.c:6642) __napi_poll (net/core/dev.c:7710) net_rx_action (net/core/dev.c:7945) handle_softirqs (kernel/softirq.c:622)
AI coding agents often install or upgrade packages automatically in generic. A medium vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <cb833bbc1b3c51e08652d3c86298307c07d3f2db || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <26900306a5a2c3e4f75c643a064525526bb6e5f3 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <0694618cf3e9b120666e31f5f383a6e466d95a0d || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <8def8fbd23f40e945febe913d04b731012ce0082 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <c55940895245d8ef658ab381248a28755218d625 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <9a05e195618a6d474f2bcd5b6376d0ffc2f00366 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <2195574dc6d9017d32ac346987e12659f931d932 | cb833bbc1b3c51e08652d3c86298307c07d3f2db, 26900306a5a2c3e4f75c643a064525526bb6e5f3, 0694618cf3e9b120666e31f5f383a6e466d95a0d, 8def8fbd23f40e945febe913d04b731012ce0082, c55940895245d8ef658ab381248a28755218d625, fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f, 9a05e195618a6d474f2bcd5b6376d0ffc2f00366, 2195574dc6d9017d32ac346987e12659f931d932 |
| Linux/Linuxgeneric | 2.6.31 | Not reported |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by CVE List V5 (cvelist).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL GuardUpdate Linux/Linux to cb833bbc1b3c51e08652d3c86298307c07d3f2db if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scannetfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO affects Linux/Linux (generic), Linux/Linux (generic). Severity is medium. In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO nf_osf_match_one() computes ctx->window % f->wss.val in the OSF_WSS_MODULO branch with no guard for f->wss.val == 0. A CAP_NET_ADMIN user can add such a fingerprint via nfnetlink; a subsequent matching TCP SYN divides by zero and panics the kernel. Reject the bogus fingerprint in nfnl_osf_add_callback() above the per-option for-loop. f->wss is per-fingerprint, not per-option, so the check must run regardless of f->opt_num (including 0). Also reject wss.wc >= OSF_WSS_MAX; nf_osf_match_one() already treats that as "should not happen". Crash: Oops: divide error: 0000 [#1] SMP KASAN NOPTI RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98) Call Trace: <IRQ> nf_osf_match (net/netfilter/nfnetlink_osf.c:220) xt_osf_match_packet (net/netfilter/xt_osf.c:32) ipt_do_table (net/ipv4/netfilter/ip_tables.c:348) nf_hook_slow (net/netfilter/core.c:622) ip_local_deliver (net/ipv4/ip_input.c:265) ip_rcv (include/linux/skbuff.h:1162) __netif_receive_skb_one_core (net/core/dev.c:6181) process_backlog (net/core/dev.c:6642) __napi_poll (net/core/dev.c:7710) net_rx_action (net/core/dev.c:7945) handle_softirqs (kernel/softirq.c:622)
AI coding agents often install or upgrade packages automatically in generic. A medium vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <cb833bbc1b3c51e08652d3c86298307c07d3f2db || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <26900306a5a2c3e4f75c643a064525526bb6e5f3 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <0694618cf3e9b120666e31f5f383a6e466d95a0d || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <8def8fbd23f40e945febe913d04b731012ce0082 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <c55940895245d8ef658ab381248a28755218d625 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <9a05e195618a6d474f2bcd5b6376d0ffc2f00366 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <2195574dc6d9017d32ac346987e12659f931d932 | cb833bbc1b3c51e08652d3c86298307c07d3f2db, 26900306a5a2c3e4f75c643a064525526bb6e5f3, 0694618cf3e9b120666e31f5f383a6e466d95a0d, 8def8fbd23f40e945febe913d04b731012ce0082, c55940895245d8ef658ab381248a28755218d625, fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f, 9a05e195618a6d474f2bcd5b6376d0ffc2f00366, 2195574dc6d9017d32ac346987e12659f931d932 |
| Linux/Linuxgeneric | 2.6.31 | Not reported |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by CVE List V5 (cvelist).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL Guard