{"id":"CVE-2026-72347","revision":"291bb31e03d84333b5361df2efb6b7d8","records":[{"revision":"291bb31e03d84333b5361df2efb6b7d8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72347","aliases":[],"title":"netfilter: xt_connmark: reject invalid shift parameters","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_connmark: reject invalid shift parameters\n\nRevision 2 of the CONNMARK target accepts user-controlled shift\nparameters and applies them to 32-bit mark values in\nconnmark_tg_shift().\n\nA shift_bits value of 32 or more triggers an undefined-shift bug when\nthe rule is evaluated. Invalid shift_dir values are also accepted and\nsilently fall back to the left-shift path.\n\nReject invalid revision-2 shift parameters in connmark_tg_check() so\nmalformed rules fail at installation time, before they can reach the\npacket path.","state":0,"publishedAt":"2026-08-15T05:55:51.665+00:00","modifiedAt":"2026-10-16T18:55:19.565+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/netfilter/xt_connmark.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"472a73e00757b971d613d796374d2727b2e4954d\",\n                            \"lessThan\": \"d8ce63d928b457fba7ed1e302492dfd32293671c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"472a73e00757b971d613d796374d2727b2e4954d\",\n                            \"lessThan\": \"9657bb11a6376ab0a79f05d433713d6944111e9d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"472a73e00757b971d613d796374d2727b2e4954d\",\n                            \"lessThan\": \"8ace320ac4416f5e5fbcd065309fb2dfcce787b0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"472a73e00757b971d613d796374d2727b2e4954d\",\n                            \"lessThan\": \"c3fa852d117b3fda72265e4230e3967db4a74fcf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"472a73e00757b971d613d796374d2727b2e4954d\",\n                            \"lessThan\": \"4eef84b09a3836919360c4232b0f16651a155eec\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"472a73e00757b971d613d796374d2727b2e4954d\",\n                            \"lessThan\": \"230173cc6105bdfb2696d37e6e56687b003fbe63\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"472a73e00757b971d613d796374d2727b2e4954d\",\n                            \"lessThan\": \"1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc\",\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/netfilter/xt_connmark.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.212\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.178\",\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:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H","score":7.3,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/d8ce63d928b457fba7ed1e302492dfd32293671c","https://git.kernel.org/stable/c/9657bb11a6376ab0a79f05d433713d6944111e9d","https://git.kernel.org/stable/c/8ace320ac4416f5e5fbcd065309fb2dfcce787b0","https://git.kernel.org/stable/c/c3fa852d117b3fda72265e4230e3967db4a74fcf","https://git.kernel.org/stable/c/4eef84b09a3836919360c4232b0f16651a155eec","https://git.kernel.org/stable/c/230173cc6105bdfb2696d37e6e56687b003fbe63","https://git.kernel.org/stable/c/1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72347","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72347","identifiers":["CVE-2026-72347"]},"retained":false,"historicalAffected":[]}],"coverage":[]}