{"id":"CVE-2024-40909","revision":"106a3a082d5b4742a6192a8729d645b1","records":[{"revision":"106a3a082d5b4742a6192a8729d645b1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2024-40909","aliases":[],"title":"bpf: Fix a potential use-after-free in bpf_link_free()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a potential use-after-free in bpf_link_free()\n\nAfter commit 1a80dbcb2dba, bpf_link can be freed by\nlink->ops->dealloc_deferred, but the code still tests and uses\nlink->ops->dealloc afterward, which leads to a use-after-free as\nreported by syzbot. Actually, one of them should be sufficient, so\njust call one of them instead of both. Also add a WARN_ON() in case\nof any problematic implementation.","state":0,"publishedAt":"2024-07-12T12:20:48.447+00:00","modifiedAt":"2026-08-05T11:33:56.691+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                        \"kernel/bpf/syscall.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"876941f533e7b47fc69977fc4551c02f2d18af97\",\n                            \"lessThan\": \"91cff53136daeff50816b0baeafd38a6976f6209\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce\",\n                            \"lessThan\": \"fa97b8fed9896f1e89cb657513e483a152d4c382\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce\",\n                            \"lessThan\": \"2884dc7d08d98a89d8d65121524bb7533183a63a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5d8d447777564b35f67000e7838e7ccb64d525c8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6.6.26\",\n                            \"lessThan\": \"6.6.35\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.8.5\",\n                            \"lessThan\": \"6.9\",\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                        \"kernel/bpf/syscall.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.9\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.35\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.9.6\",\n                            \"lessThanOrEqual\": \"6.9.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.10\",\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:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209","https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382","https://git.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-40909","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-40909","identifiers":["CVE-2024-40909"]},"retained":false,"historicalAffected":[]}],"coverage":[]}