{"id":"CVE-2026-72057","revision":null,"records":[{"revision":"181bdcda04d94b16833dee57630e326c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72057","aliases":[],"title":"net/sched: act_ct: preserve tc_skb_cb across defragmentation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ct: preserve tc_skb_cb across defragmentation\n\ntcf_ct_handle_fragments() calls nf_ct_handle_fragments() without saving\nand restoring skb->cb. The defrag helper clears IPCB/IP6CB, which aliases\nthe tc_skb_cb/qdisc_skb_cb control buffer. Fragmented traffic through\nact_ct therefore loses qdisc metadata such as pkt_segs and can trigger\nWARN_ON_ONCE() in qdisc_pkt_segs() when panic_on_warn is enabled.\n\nSave and restore the full tc_skb_cb around nf_ct_handle_fragments(),\nmatching the pattern used by ovs_ct_handle_fragments().","state":0,"publishedAt":"2026-08-15T05:52:12.873+00:00","modifiedAt":"2026-10-19T21:19:25.539+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/sched/act_ct.c\"\n ],\n \"versions\": [\n {\n \"version\": \"0d76daf2013ce1da20eab5e26bd81d983e1c18fb\",\n \"lessThan\": \"fb080b6f54835d5d4d11ce3122800e6f0f6689e6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ec624fe740b416fb68d536b37fb8eef46f90b5c2\",\n \"lessThan\": \"67d6b00a54446c008f52cf70fc0c2ad0c712f85d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ec624fe740b416fb68d536b37fb8eef46f90b5c2\",\n \"lessThan\": \"2400c4b05d58834b994500a9eec90a37db44187c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ec624fe740b416fb68d536b37fb8eef46f90b5c2\",\n \"lessThan\": \"5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ec624fe740b416fb68d536b37fb8eef46f90b5c2\",\n \"lessThan\": \"b3d835407846134b0d54637c0281b39bebef831d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ec624fe740b416fb68d536b37fb8eef46f90b5c2\",\n \"lessThan\": \"f7f45ceb855d9ba1cba594fb3f383255f7013fad\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ec624fe740b416fb68d536b37fb8eef46f90b5c2\",\n \"lessThan\": \"9092e15defbe6c7bc241c306093ca9d358a578e7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.15.13\",\n \"lessThan\": \"5.15.217\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\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/sched/act_ct.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.16\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.16\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.217\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.184\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.97\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.40\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.5\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\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:N/I:L/A:H","score":8.2,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/fb080b6f54835d5d4d11ce3122800e6f0f6689e6","https://git.kernel.org/stable/c/67d6b00a54446c008f52cf70fc0c2ad0c712f85d","https://git.kernel.org/stable/c/2400c4b05d58834b994500a9eec90a37db44187c","https://git.kernel.org/stable/c/5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac","https://git.kernel.org/stable/c/b3d835407846134b0d54637c0281b39bebef831d","https://git.kernel.org/stable/c/f7f45ceb855d9ba1cba594fb3f383255f7013fad","https://git.kernel.org/stable/c/9092e15defbe6c7bc241c306093ca9d358a578e7"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72057","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72057","identifiers":["CVE-2026-72057"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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