{"id":"CVE-2025-37959","revision":null,"records":[{"revision":"31aa8cbb156f4496939d80e993794674","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-37959","aliases":[],"title":"bpf: Scrub packet on bpf_redirect_peer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Scrub packet on bpf_redirect_peer\n\nWhen bpf_redirect_peer is used to redirect packets to a device in\nanother network namespace, the skb isn't scrubbed. That can lead skb\ninformation from one namespace to be \"misused\" in another namespace.\n\nAs one example, this is causing Cilium to drop traffic when using\nbpf_redirect_peer to redirect packets that just went through IPsec\ndecryption to a container namespace. The following pwru trace shows (1)\nthe packet path from the host's XFRM layer to the container's XFRM\nlayer where it's dropped and (2) the number of active skb extensions at\neach function.\n\n NETNS MARK IFACE TUPLE FUNC\n 4026533547 d00 eth0 10.244.3.124:35473->10.244.2.158:53 xfrm_rcv_cb\n .active_extensions = (__u8)2,\n 4026533547 d00 eth0 10.244.3.124:35473->10.244.2.158:53 xfrm4_rcv_cb\n .active_extensions = (__u8)2,\n 4026533547 d00 eth0 10.244.3.124:35473->10.244.2.158:53 gro_cells_receive\n .active_extensions = (__u8)2,\n [...]\n 4026533547 0 eth0 10.244.3.124:35473->10.244.2.158:53 skb_do_redirect\n .active_extensions = (__u8)2,\n 4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 ip_rcv\n .active_extensions = (__u8)2,\n 4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 ip_rcv_core\n .active_extensions = (__u8)2,\n [...]\n 4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 udp_queue_rcv_one_skb\n .active_extensions = (__u8)2,\n 4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 __xfrm_policy_check\n .active_extensions = (__u8)2,\n 4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 __xfrm_decode_session\n .active_extensions = (__u8)2,\n 4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 security_xfrm_decode_session\n .active_extensions = (__u8)2,\n 4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 kfree_skb_reason(SKB_DROP_REASON_XFRM_POLICY)\n .active_extensions = (__u8)2,\n\nIn this case, there are no XFRM policies in the container's network\nnamespace so the drop is unexpected. When we decrypt the IPsec packet,\nthe XFRM state used for decryption is set in the skb extensions. This\ninformation is preserved across the netns switch. When we reach the\nXFRM policy check in the container's netns, __xfrm_policy_check drops\nthe packet with LINUX_MIB_XFRMINNOPOLS because a (container-side) XFRM\npolicy can't be found that matches the (host-side) XFRM state used for\ndecryption.\n\nThis patch fixes this by scrubbing the packet when using\nbpf_redirect_peer, as is done on typical netns switches via veth\ndevices except skb->mark and skb->tstamp are not zeroed.","state":0,"publishedAt":"2025-05-20T16:01:52.547+00:00","modifiedAt":"2026-10-15T21:52:05.352+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/core/filter.c\"\n ],\n \"versions\": [\n {\n \"version\": \"9aa1206e8f48222f35a0c809f33b2f4aaa1e2661\",\n \"lessThan\": \"de1067cc8cf0e8c11ae20cbe5c467aef19d04ded\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"9aa1206e8f48222f35a0c809f33b2f4aaa1e2661\",\n \"lessThan\": \"355b0526336c0bf2bf7feaca033568ede524f763\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"9aa1206e8f48222f35a0c809f33b2f4aaa1e2661\",\n \"lessThan\": \"b37e54259cab4f78b53953d6f6268b85f07bef3e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"9aa1206e8f48222f35a0c809f33b2f4aaa1e2661\",\n \"lessThan\": \"9e15ef33ba39fb6d9d1f51445957f16983a9437a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"9aa1206e8f48222f35a0c809f33b2f4aaa1e2661\",\n \"lessThan\": \"c4327229948879814229b46aa26a750718888503\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/core/filter.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.10\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.10\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.139\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.91\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.29\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.14.7\",\n \"lessThanOrEqual\": \"6.14.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.15\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H","score":9.4,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/de1067cc8cf0e8c11ae20cbe5c467aef19d04ded","https://git.kernel.org/stable/c/355b0526336c0bf2bf7feaca033568ede524f763","https://git.kernel.org/stable/c/b37e54259cab4f78b53953d6f6268b85f07bef3e","https://git.kernel.org/stable/c/9e15ef33ba39fb6d9d1f51445957f16983a9437a","https://git.kernel.org/stable/c/c4327229948879814229b46aa26a750718888503"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-37959","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-37959","identifiers":["CVE-2025-37959"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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