{"id":"CVE-2026-90067","revision":"e1e22c6511d24ca7b7cc45533faa8a3e","records":[{"revision":"e1e22c6511d24ca7b7cc45533faa8a3e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90067","aliases":[],"title":"libceph: validate banner payload length","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: validate banner payload length\n\nWhen parsing the Ceph messenger v2 protocol banner, the `payload_len` field\nis decoded from the banner prefix. If a client sends a banner with a\n`payload_len` of 0, the kernel sets up a 0-length socket read. This\nviolates an invariant in the state machine, triggering a warning in\n`populate_in_iter()`:\n\n------------[ cut here ]------------\n!iov_iter_count(&con->v2.in_iter)\nWARNING: net/ceph/messenger_v2.c:3129 at populate_in_iter\nnet/ceph/messenger_v2.c:3129 [inline], CPU#1: kworker/1:3/5070\nWARNING: net/ceph/messenger_v2.c:3129 at ceph_con_v2_try_read+0x6634/0x6810\nnet/ceph/messenger_v2.c:3159, CPU#1: kworker/1:3/5070\n...\nCall Trace:\n \n ceph_con_workfn+0x1f5/0x14a0 net/ceph/messenger.c:1575\n process_one_work kernel/workqueue.c:3322 [inline]\n process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405\n worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486\n kthread+0x388/0x470 kernel/kthread.c:436\n ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \n\nAccording to the msgr2 protocol specification, the banner payload is\nexpected to contain at least two 64-bit integers (`server_feat` and\n`server_req_feat`). Therefore, `payload_len` must be at least 16 bytes.\n\nFix this by adding a check in `process_banner_prefix()` to reject a\n`payload_len` smaller than 16 bytes. This prevents the 0-length read and\ncorrectly aborts the connection with a protocol error.","state":0,"publishedAt":"2026-09-17T16:05:49.6+00:00","modifiedAt":"2026-10-19T08:57:24.503+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/ceph/messenger_v2.c\"\n ],\n \"versions\": [\n {\n \"version\": \"cd1a677cad994021b19665ed476aea63f5d54f31\",\n \"lessThan\": \"279c0852999fd2384f4a88155091a99e81f96873\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cd1a677cad994021b19665ed476aea63f5d54f31\",\n \"lessThan\": \"6cf666e47f2b51d5a887ec8a3226cde951757d27\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cd1a677cad994021b19665ed476aea63f5d54f31\",\n \"lessThan\": \"3b2e62a7655d347a845a91155610ddae11daffc6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cd1a677cad994021b19665ed476aea63f5d54f31\",\n \"lessThan\": \"c1b937ff24b19e69aa7fb1b0f46a74d4c9668692\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cd1a677cad994021b19665ed476aea63f5d54f31\",\n \"lessThan\": \"6d1c6f228854aa89844fd0152d7ed7ac72a55e89\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cd1a677cad994021b19665ed476aea63f5d54f31\",\n \"lessThan\": \"c77633a9595658210a6e216a071e5a396a0835a7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cd1a677cad994021b19665ed476aea63f5d54f31\",\n \"lessThan\": \"f374967fcdf04001c9b66df1c19106fa83cd91f7\",\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/ceph/messenger_v2.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.11\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.11\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.221\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.188\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.157\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.110\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.52\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.6\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\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:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/279c0852999fd2384f4a88155091a99e81f96873","https://git.kernel.org/stable/c/6cf666e47f2b51d5a887ec8a3226cde951757d27","https://git.kernel.org/stable/c/3b2e62a7655d347a845a91155610ddae11daffc6","https://git.kernel.org/stable/c/c1b937ff24b19e69aa7fb1b0f46a74d4c9668692","https://git.kernel.org/stable/c/6d1c6f228854aa89844fd0152d7ed7ac72a55e89","https://git.kernel.org/stable/c/c77633a9595658210a6e216a071e5a396a0835a7","https://git.kernel.org/stable/c/f374967fcdf04001c9b66df1c19106fa83cd91f7"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90067","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90067","identifiers":["CVE-2026-90067"]},"retained":false,"historicalAffected":[]}],"coverage":[]}