{"id":"CVE-2026-45856","revision":"abafaede0b0d4a31a29632625455c177","records":[{"revision":"abafaede0b0d4a31a29632625455c177","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-45856","aliases":[],"title":"RDMA/uverbs: Validate wqe_size before using it in ib_uverbs_post_send","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/uverbs: Validate wqe_size before using it in ib_uverbs_post_send\n\nib_uverbs_post_send() uses cmd.wqe_size from userspace without any\nvalidation before passing it to kmalloc() and using the allocated\nbuffer as struct ib_uverbs_send_wr.\n\nIf a user provides a small wqe_size value (e.g., 1), kmalloc() will\nsucceed, but subsequent accesses to user_wr->opcode, user_wr->num_sge,\nand other fields will read beyond the allocated buffer, resulting in\nan out-of-bounds read from kernel heap memory. This could potentially\nleak sensitive kernel information to userspace.\n\nAdditionally, providing an excessively large wqe_size can trigger a\nWARNING in the memory allocation path, as reported by syzkaller.\n\nThis is inconsistent with ib_uverbs_unmarshall_recv() which properly\nvalidates that wqe_size >= sizeof(struct ib_uverbs_recv_wr) before\nproceeding.\n\nAdd the same validation for ib_uverbs_post_send() to ensure wqe_size\nis at least sizeof(struct ib_uverbs_send_wr).","state":0,"publishedAt":"2026-05-27T12:15:33.209+00:00","modifiedAt":"2026-10-19T19:26:38.46+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/uverbs_cmd.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c3bea3d2dc5358e05541527283279102383b0231\",\n                            \"lessThan\": \"9c15ec4cd4e7f57c6bbcb4e73e99290f150dd2a7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c3bea3d2dc5358e05541527283279102383b0231\",\n                            \"lessThan\": \"9b5ac1c15334d46c0dbd49d64a2257b929500163\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c3bea3d2dc5358e05541527283279102383b0231\",\n                            \"lessThan\": \"01c9b152647dc70dc06a4a2eff86ebb3b3c76075\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c3bea3d2dc5358e05541527283279102383b0231\",\n                            \"lessThan\": \"bf1feed1a7886af945f92890493aefd2b5c9928a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c3bea3d2dc5358e05541527283279102383b0231\",\n                            \"lessThan\": \"d533425ac1f2925b4fc3e4ed9b9d72362cb23475\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c3bea3d2dc5358e05541527283279102383b0231\",\n                            \"lessThan\": \"bf4454da8b1e712714628c0a0d6e7845bb40790a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c3bea3d2dc5358e05541527283279102383b0231\",\n                            \"lessThan\": \"bef70ff9841990658610512b4a18e4a88c9b4df6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c3bea3d2dc5358e05541527283279102383b0231\",\n                            \"lessThan\": \"1956f0a74ccf5dc9c3ef717f2985c3ed3400aab0\",\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/uverbs_cmd.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.0\",\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:N/A:H","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/9c15ec4cd4e7f57c6bbcb4e73e99290f150dd2a7","https://git.kernel.org/stable/c/9b5ac1c15334d46c0dbd49d64a2257b929500163","https://git.kernel.org/stable/c/01c9b152647dc70dc06a4a2eff86ebb3b3c76075","https://git.kernel.org/stable/c/bf1feed1a7886af945f92890493aefd2b5c9928a","https://git.kernel.org/stable/c/d533425ac1f2925b4fc3e4ed9b9d72362cb23475","https://git.kernel.org/stable/c/bf4454da8b1e712714628c0a0d6e7845bb40790a","https://git.kernel.org/stable/c/bef70ff9841990658610512b4a18e4a88c9b4df6","https://git.kernel.org/stable/c/1956f0a74ccf5dc9c3ef717f2985c3ed3400aab0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-45856","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-45856","identifiers":["CVE-2026-45856"]},"retained":false,"historicalAffected":[]}],"coverage":[]}