RDMA/uverbs: Validate wqe_size before using it in ib_uverbs_post_send

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Summary

CVECVE-2026-45856
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:16:57 UTC
Updated2026-05-30 11:17:07 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: RDMA/uverbs: Validate wqe_size before using it in ib_uverbs_post_send ib_uverbs_post_send() uses cmd.wqe_size from userspace without any validation before passing it to kmalloc() and using the allocated buffer as struct ib_uverbs_send_wr. If a user provides a small wqe_size value (e.g., 1), kmalloc() will succeed, but subsequent accesses to user_wr->opcode, user_wr->num_sge, and other fields will read beyond the allocated buffer, resulting in an out-of-bounds read from kernel heap memory. This could potentially leak sensitive kernel information to userspace. Additionally, providing an excessively large wqe_size can trigger a WARNING in the memory allocation path, as reported by syzkaller. This is inconsistent with ib_uverbs_unmarshall_recv() which properly validates that wqe_size >= sizeof(struct ib_uverbs_recv_wr) before proceeding. Add the same validation for ib_uverbs_post_send() to ensure wqe_size is at least sizeof(struct ib_uverbs_send_wr).

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.000120000 probability, percentile 0.018360000 (date 2026-06-01)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c3bea3d2dc5358e05541527283279102383b0231 9c15ec4cd4e7f57c6bbcb4e73e99290f150dd2a7 git Not specified
CNA Linux Linux affected c3bea3d2dc5358e05541527283279102383b0231 9b5ac1c15334d46c0dbd49d64a2257b929500163 git Not specified
CNA Linux Linux affected c3bea3d2dc5358e05541527283279102383b0231 01c9b152647dc70dc06a4a2eff86ebb3b3c76075 git Not specified
CNA Linux Linux affected c3bea3d2dc5358e05541527283279102383b0231 bf1feed1a7886af945f92890493aefd2b5c9928a git Not specified
CNA Linux Linux affected c3bea3d2dc5358e05541527283279102383b0231 d533425ac1f2925b4fc3e4ed9b9d72362cb23475 git Not specified
CNA Linux Linux affected c3bea3d2dc5358e05541527283279102383b0231 bf4454da8b1e712714628c0a0d6e7845bb40790a git Not specified
CNA Linux Linux affected c3bea3d2dc5358e05541527283279102383b0231 bef70ff9841990658610512b4a18e4a88c9b4df6 git Not specified
CNA Linux Linux affected c3bea3d2dc5358e05541527283279102383b0231 1956f0a74ccf5dc9c3ef717f2985c3ed3400aab0 git Not specified
CNA Linux Linux affected 5.0 Not specified
CNA Linux Linux unaffected 5.0 semver Not specified
CNA Linux Linux unaffected 5.10.252 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.202 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bf4454da8b1e712714628c0a0d6e7845bb40790a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/01c9b152647dc70dc06a4a2eff86ebb3b3c76075 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d533425ac1f2925b4fc3e4ed9b9d72362cb23475 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9b5ac1c15334d46c0dbd49d64a2257b929500163 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bf1feed1a7886af945f92890493aefd2b5c9928a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1956f0a74ccf5dc9c3ef717f2985c3ed3400aab0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9c15ec4cd4e7f57c6bbcb4e73e99290f150dd2a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bef70ff9841990658610512b4a18e4a88c9b4df6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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