{"id":"CVE-2025-21683","revision":null,"records":[{"revision":"a4ad45f5bc5245b0828a701df86a864e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-21683","aliases":[],"title":"bpf: Fix bpf_sk_select_reuseport() memory leak","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix bpf_sk_select_reuseport() memory leak\n\nAs pointed out in the original comment, lookup in sockmap can return a TCP\nESTABLISHED socket. Such TCP socket may have had SO_ATTACH_REUSEPORT_EBPF\nset before it was ESTABLISHED. In other words, a non-NULL sk_reuseport_cb\ndoes not imply a non-refcounted socket.\n\nDrop sk's reference in both error paths.\n\nunreferenced object 0xffff888101911800 (size 2048):\n comm \"test_progs\", pid 44109, jiffies 4297131437\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n 80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace (crc 9336483b):\n __kmalloc_noprof+0x3bf/0x560\n __reuseport_alloc+0x1d/0x40\n reuseport_alloc+0xca/0x150\n reuseport_attach_prog+0x87/0x140\n sk_reuseport_attach_bpf+0xc8/0x100\n sk_setsockopt+0x1181/0x1990\n do_sock_setsockopt+0x12b/0x160\n __sys_setsockopt+0x7b/0xc0\n __x64_sys_setsockopt+0x1b/0x30\n do_syscall_64+0x93/0x180\n entry_SYSCALL_64_after_hwframe+0x76/0x7e","state":0,"publishedAt":"2025-01-31T11:25:42.903+00:00","modifiedAt":"2026-10-15T01:03:01.511+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\": \"64d85290d79c0677edb5a8ee2295b36c022fa5df\",\n \"lessThan\": \"bb36838dac7bb334a3f3d7eb29875593ec9473fc\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"64d85290d79c0677edb5a8ee2295b36c022fa5df\",\n \"lessThan\": \"0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"64d85290d79c0677edb5a8ee2295b36c022fa5df\",\n \"lessThan\": \"d0a3b3d1176d39218b8edb2a2d03164942ab9ccd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"64d85290d79c0677edb5a8ee2295b36c022fa5df\",\n \"lessThan\": \"b02e70be498b138e9c21701c2f33f4018ca7cd5e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"64d85290d79c0677edb5a8ee2295b36c022fa5df\",\n \"lessThan\": \"cccd51dd22574216e64e5d205489e634f86999f3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"64d85290d79c0677edb5a8ee2295b36c022fa5df\",\n \"lessThan\": \"b3af60928ab9129befa65e6df0310d27300942bf\",\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\": \"5.8\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.8\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.234\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.177\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.127\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.74\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.11\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.13\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/bb36838dac7bb334a3f3d7eb29875593ec9473fc","https://git.kernel.org/stable/c/0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf","https://git.kernel.org/stable/c/d0a3b3d1176d39218b8edb2a2d03164942ab9ccd","https://git.kernel.org/stable/c/b02e70be498b138e9c21701c2f33f4018ca7cd5e","https://git.kernel.org/stable/c/cccd51dd22574216e64e5d205489e634f86999f3","https://git.kernel.org/stable/c/b3af60928ab9129befa65e6df0310d27300942bf"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-21683","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-21683","identifiers":["CVE-2025-21683"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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