{"id":"CVE-2026-74631","revision":"32732c5f08524e97af56c7efbd272366","records":[{"revision":"32732c5f08524e97af56c7efbd272366","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74631","aliases":[],"title":"net: smc: fix splice entry lifetime imbalance in smc_rx_splice","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: smc: fix splice entry lifetime imbalance in smc_rx_splice\n\nsmc_rx_splice() passes pages to splice_to_pipe() before taking the\nreferences that cover the lifetime of each splice entry. In the\nVM-backed RMB path, splice_to_pipe() may drop unqueued entries through\nsmc_rx_spd_release(), while queued entries are released later via the\npipe buffer callback.\n\nThe old post-splice accounting also derives the number of queued VM pages\nfrom an offset mutated while building the descriptor, and a multi-page\nsplice pairs one sock_hold() with multiple sock_put() calls.\n\nTake the page and socket references for every candidate entry before\nsplice_to_pipe(), and drop the matching private state, page reference,\nand socket reference from smc_rx_spd_release() for entries that never\nget queued. This fixes a refcount imbalance that can underflow page\nrefcounts and trigger a use-after-free.","state":0,"publishedAt":"2026-08-22T15:32:12.334+00:00","modifiedAt":"2026-10-16T19:06:03.774+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/smc/smc_rx.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f\",\n                            \"lessThan\": \"7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f\",\n                            \"lessThan\": \"07ad246529d136d5ef441d5ab4c305d132ff3090\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f\",\n                            \"lessThan\": \"c841789e456ec6751342fa800639ce8e82ff0e6b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f\",\n                            \"lessThan\": \"af02c67ce654356c58db20a0bb2db33ace3b07a8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f\",\n                            \"lessThan\": \"ca8342b5fc24c249fdb998468f6a168b457c67e5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f\",\n                            \"lessThan\": \"0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f\",\n                            \"lessThan\": \"4515c78f4d9fd577270f012efeb062ea58b3682d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f\",\n                            \"lessThan\": \"5d9686af2976741bbd79b150d1c9e60b81e7f12e\",\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/smc/smc_rx.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.18\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.18\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.266\",\n                            \"lessThanOrEqual\": \"5.10.*\",\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\": \"6.1.183\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.152\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.104\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.45\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.9\",\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:N/UI:N/S:U/C:H/I:H/A:H","score":8.4,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb","https://git.kernel.org/stable/c/07ad246529d136d5ef441d5ab4c305d132ff3090","https://git.kernel.org/stable/c/c841789e456ec6751342fa800639ce8e82ff0e6b","https://git.kernel.org/stable/c/af02c67ce654356c58db20a0bb2db33ace3b07a8","https://git.kernel.org/stable/c/ca8342b5fc24c249fdb998468f6a168b457c67e5","https://git.kernel.org/stable/c/0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0","https://git.kernel.org/stable/c/4515c78f4d9fd577270f012efeb062ea58b3682d","https://git.kernel.org/stable/c/5d9686af2976741bbd79b150d1c9e60b81e7f12e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74631","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74631","identifiers":["CVE-2026-74631"]},"retained":false,"historicalAffected":[]}],"coverage":[]}