{"id":"CVE-2026-23243","revision":"189a5d441acf4420abe0946742cf6413","records":[{"revision":"189a5d441acf4420abe0946742cf6413","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-23243","aliases":[],"title":"RDMA/umad: Reject negative data_len in ib_umad_write","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/umad: Reject negative data_len in ib_umad_write\n\nib_umad_write computes data_len from user-controlled count and the\nMAD header sizes. With a mismatched user MAD header size and RMPP\nheader length, data_len can become negative and reach ib_create_send_mad().\nThis can make the padding calculation exceed the segment size and trigger\nan out-of-bounds memset in alloc_send_rmpp_list().\n\nAdd an explicit check to reject negative data_len before creating the\nsend buffer.\n\nKASAN splat:\n[  211.363464] BUG: KASAN: slab-out-of-bounds in ib_create_send_mad+0xa01/0x11b0\n[  211.364077] Write of size 220 at addr ffff88800c3fa1f8 by task spray_thread/102\n[  211.365867] ib_create_send_mad+0xa01/0x11b0\n[  211.365887] ib_umad_write+0x853/0x1c80","state":0,"publishedAt":"2026-03-18T10:05:05.826+00:00","modifiedAt":"2026-10-19T18:35:40.101+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                        \"drivers/infiniband/core/user_mad.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\",\n                            \"lessThan\": \"1371ef6b1ecf3676b8942f5dfb3634fb0648128e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\",\n                            \"lessThan\": \"362e45fd9069ffa1523f9f1633b606ebf72060d7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\",\n                            \"lessThan\": \"6eb2919474ca105c5b13d19574e25f0ddcf19ca2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\",\n                            \"lessThan\": \"a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\",\n                            \"lessThan\": \"9c80d688f402539dfc8f336de1380d6b4ee14316\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\",\n                            \"lessThan\": \"205955f29c26330b1dc7fdeadd5bb97c38e26f56\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\",\n                            \"lessThan\": \"52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\",\n                            \"lessThan\": \"5551b02fdbfd85a325bb857f3a8f9c9f33397ed2\",\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                        \"drivers/infiniband/core/user_mad.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.24\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.24\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.252\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.202\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.165\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.128\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.75\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.14\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.4\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\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/1371ef6b1ecf3676b8942f5dfb3634fb0648128e","https://git.kernel.org/stable/c/362e45fd9069ffa1523f9f1633b606ebf72060d7","https://git.kernel.org/stable/c/6eb2919474ca105c5b13d19574e25f0ddcf19ca2","https://git.kernel.org/stable/c/a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d","https://git.kernel.org/stable/c/9c80d688f402539dfc8f336de1380d6b4ee14316","https://git.kernel.org/stable/c/205955f29c26330b1dc7fdeadd5bb97c38e26f56","https://git.kernel.org/stable/c/52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b","https://git.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23243","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-23243","identifiers":["CVE-2026-23243"]},"retained":false,"historicalAffected":[]}],"coverage":[]}